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学者姓名：贺定勇
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Abstract ：
Soil-engaging components of agricultural machinery are susceptible to physical degradation due to the long-term wear from sand, gravel, weeds, and plant stalks. In order to improve their wear resistance and prolong the service life, a hardfacing alloy of hypoeutectic high chromium cast iron containing TiC was made on the Q235 steel substrate via the flux-cored arc welding method. Effects of in-situ precipitation of TiC and direct addition of TiC to the powder core on the wear resistance of hardfacing alloy were studied by the MLS-225 wet rubber wheel wear tester and self-made impeller-roller impact-abrasion testing machine. In addition, after tests, the samples were characterized using optical microscope (OM), Rockwell hardness tester, X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS). The results showed that the hardfacing alloy of hypoeutectic high chromium cast iron mainly consists of gamma-Fe, alpha-Fe, M7C3, and TiC, TiC can act as the heterogeneous nucleation core for precipitates austenite first in the organization, increasing their nucleation rate and preventing their growth during solidification, resulting in the refinement of the austenite organization. The TiC introduced by in-situ synthesis has a smaller size and a more diffusely homogeneous distribution than that introduced by direct addition to the powder core. In addition, TiC increased the content of eutectic carbides in the organization and improved the hardness of the hardfacing alloy. The wear forms of all three hardfacing alloys after the abrasive wear test are dominated by micro-cutting, and the grooves on the wear surface of the hardfacing alloy without added TiC are wider and deeper, in the hardfacing alloys with added TiC, the diffusely distributed TiC increased the resistance of abrasive particles cutting, made the grooves shallower, reduced the cracking and spalling of eutectic carbides during the wear process, significantly improved the resistance of hardfacing alloys to abrasive wear. The resistance to abrasive wear performance of TiC hardfacing alloy introduced by in-situ synthesis was 5.2 times higher than that of hardfacing alloy without TiC addition. The surfaces of three kinds of hardfacing alloys after the impact-abrasion test have similar characteristics, due to the periodic impact of abrasive particles leading to hardfacing alloys plastic deformation and work-hardening so that their strength and hardness rose, plasticity and toughness declined, with the continued impact of abrasive particles, cracking occurred in the material and the cracks continue to extend within the material causing it to spalled. The hardness of added TiC hardfacing alloys was higher, can more effectively resist the embedding of abrasive particles, and reduce the generation and expansion of cracks due to the abrasive particles impact on the surface of the material generated by the plastic deformation, the resistance to impact-abrasion performance is more excellent. The resistance to impact-abrasion of TiC hardfacing alloy introduced by in-situ synthesis was 1.2 times higher than that of hardfacing alloy without TiC addition. The resistance to abrasive wear and impact-abrasion of the hardfacing alloy with in-situ precipitation of TiC is better than that of the hardfacing alloy with the direct addition of TiC to the powder core. TiC significantly improved the resistance to abrasive wear performance and impact-abrasion performance of the hardfacing alloy, in which the performance of the hardfacing alloy with in-situ precipitation of TiC is more excellent, which can provide a reference for the research and application of TiC in wear-resistant coatings for Soil-engaging components of agricultural machinery.
Keyword ：
impact-abrasion impact-abrasion abrasive wear abrasive wear TiC TiC hypoeutectic high chromium cast iron hypoeutectic high chromium cast iron flux-cored welding wire flux-cored welding wire
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| GB/T 7714 | Ma, Xiaohan , He, Dingyong , Qin, Zhiheng et al. Effects of TiC on the Microstructure and Wear Resistance of Hypoeutectic Fe-Cr-C Hardfacing Alloy [J]. | CHINA SURFACE ENGINEERING , 2024 , 37 (4) : 142-150 . |
| MLA | Ma, Xiaohan et al. "Effects of TiC on the Microstructure and Wear Resistance of Hypoeutectic Fe-Cr-C Hardfacing Alloy" . | CHINA SURFACE ENGINEERING 37 . 4 (2024) : 142-150 . |
| APA | Ma, Xiaohan , He, Dingyong , Qin, Zhiheng , Wang, Guohong , Xu, Yi , Yu, Jinman . Effects of TiC on the Microstructure and Wear Resistance of Hypoeutectic Fe-Cr-C Hardfacing Alloy . | CHINA SURFACE ENGINEERING , 2024 , 37 (4) , 142-150 . |
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Abstract ：
PurposeThe selective laser melting (SLM) technique, as a typical additive manufacturing process, is widely used for the fabrication of metallic biomedical components. In terms of biodegradability, zinc and its alloys represent an emerging generation of metallic materials for biomedical implants. The purpose of this paper is to obtain the Zn and Zn10Mg alloys with high mechanical properties using the SLM technology. The relationship between the processing parameters and the porosity of pure Zn and Zn10Mg alloy samples was investigated. Design/methodology/approachThe samples were fabricated using SLM technology working in an inert gas closed chamber. Preliminary experiments were conducted to analyze the laser power and gas flow on evaporation, single track form and porosity. To evaluate the influence of factors on relative density, the response surface methodology was applied. FindingsThe satisfactory results of the proposed method were achieved, in which the relative density of the components reached up to 99.63%, and compression strength reached 214 & PLUSMN; 13 MPa under optimal processing conditions. Originality/valueZinc is categorized by its low melting and boiling point, which leads to the high porosity of the components. It is difficult to prepare the Zn alloy samples with high relative density using SLM technology. This work successfully achieved dense Zn and Zn10Mg samples and investigated their microstructure, mechanical properties and corrosion behavior.
Keyword ：
Mechanical properties Mechanical properties Pure Zn powders Pure Zn powders Selective laser melting Selective laser melting Zn10Mg alloy Zn10Mg alloy Additive manufacturing Additive manufacturing
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| GB/T 7714 | Waqas, Muhammad , He, Dingyong , Tan, Zhen et al. A study of selective laser melting process for pure zinc and Zn10mg alloy on process parameters and mechanical properties [J]. | RAPID PROTOTYPING JOURNAL , 2023 , 29 (9) : 1923-1939 . |
| MLA | Waqas, Muhammad et al. "A study of selective laser melting process for pure zinc and Zn10mg alloy on process parameters and mechanical properties" . | RAPID PROTOTYPING JOURNAL 29 . 9 (2023) : 1923-1939 . |
| APA | Waqas, Muhammad , He, Dingyong , Tan, Zhen , Yang, Peng , Gao, Mu , Guo, Xingye . A study of selective laser melting process for pure zinc and Zn10mg alloy on process parameters and mechanical properties . | RAPID PROTOTYPING JOURNAL , 2023 , 29 (9) , 1923-1939 . |
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Abstract ：
一种电弧增材制造高强Al‑Mg系合金成形件的方法，涉及铝合金增材制造领域。电弧增材制造(WAAM)工艺制备Al‑Mg系合金越来越受到广泛的关注，但目前已有的WAAM工艺制备Al‑Mg系合金强度不高，绝大部分无法达到工业使用的需求。本专利采用熔化极惰性气体保护(MIG)增材制造系统，以高镁焊丝(Mg 5.5～6.8wt％，Zr≤0.1wt％)为丝材，采用单道摆动的方式往复式逐层沉积成形，调控焊接工艺参数，获得成形优良的高强Al‑Mg系铝合金成形件，抗拉强度最高达365.0MPa，断后延伸率为25.5％，具有优良的强度和塑性结合。
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| GB/T 7714 | 崔丽 , 翟利民 , 贺定勇 et al. 一种电弧增材制造高强Al-Mg系合金成形件的方法 : CN202310211381.7[P]. | 2023-02-27 . |
| MLA | 崔丽 et al. "一种电弧增材制造高强Al-Mg系合金成形件的方法" : CN202310211381.7. | 2023-02-27 . |
| APA | 崔丽 , 翟利民 , 贺定勇 , 黄晖 , 魏午 . 一种电弧增材制造高强Al-Mg系合金成形件的方法 : CN202310211381.7. | 2023-02-27 . |
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Abstract ：
本发明公开了一种竹笋结构W‑Zr基非晶合金复合材料及其制备方法与应用，涉及金属复合材料技术领域，复合材料的整体结构上分别存在硬脆区和软韧区，其中硬脆区体积分数为10％～30％，软韧区体积分数为70％～90％，两区域呈锥形交替分布，其分布为仿生竹笋结构，这种竹笋结构的优势在于：在高应变速率条件下，软韧区先发生变形，随着变形程度增加，软韧区与硬脆区同时变形，随后硬脆区开裂，沿着设计结构方式分离脱落，重新露出尖锐区域完成自锐化，类似竹笋剥落；循环此步骤，完成侵彻过程，可显著增加穿甲弹威力。
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| GB/T 7714 | 谈震 , 席钊 , 宁子阳 et al. 一种竹笋结构W-Zr基非晶合金复合材料及其制备方法与应用 : CN202310055654.3[P]. | 2023-01-17 . |
| MLA | 谈震 et al. "一种竹笋结构W-Zr基非晶合金复合材料及其制备方法与应用" : CN202310055654.3. | 2023-01-17 . |
| APA | 谈震 , 席钊 , 宁子阳 , 贺定勇 , 周正 , 郭星晔 et al. 一种竹笋结构W-Zr基非晶合金复合材料及其制备方法与应用 : CN202310055654.3. | 2023-01-17 . |
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Abstract ：
本发明涉及一种具有钨骨架结构的钨铜复合材料微通道散热器及其制备方法，涉及增材制造技术及微通道散热技术领域。本发明利用激光增材制造技术，按照所设计微通道结构的模型进行切片处理、区域划分及激光扫描策略规划，通过不同区域的激光工艺参数、激光扫描策略与钨铜粉末比例匹配，一体成形制备出具有钨骨架结构的钨铜复合材料微通道散热器，随后对微通道进行磨粒流抛光后处理，使微通道具有适宜的内表面粗糙度。所制备的微通道散热器散热性能优良，热膨胀系数能与电子元件的基体材料相匹配，钨骨架显著改善散热器高温性能并实现结构功能一体化，为微电子领域提供更有效率、成本更低的散热解决方案。
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| GB/T 7714 | 贺定勇 , 李小璇 , 谈震 et al. 一种具有钨骨架结构的钨铜复合材料微通道散热器及其制备方法 : CN202310249027.3[P]. | 2023-03-15 . |
| MLA | 贺定勇 et al. "一种具有钨骨架结构的钨铜复合材料微通道散热器及其制备方法" : CN202310249027.3. | 2023-03-15 . |
| APA | 贺定勇 , 李小璇 , 谈震 , 郭星晔 , 邵蔚 , 周正 et al. 一种具有钨骨架结构的钨铜复合材料微通道散热器及其制备方法 : CN202310249027.3. | 2023-03-15 . |
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Abstract ：
Strengthening low-chromium iron-based alloys with multiple alloy elements is a crucial strategy for developing "casing-friendly" hardbanding materials. In this paper, four kinds of low-chromium iron-based hardfacing alloys with different Ti contents were prepared by flux-cored arc welding technology, and the effect of Ti content on the microstructure, hardness, and wear performance under the abrasive wear and dry sliding wear was analyzed. The in situ TiC-reinforced iron-based hardfacing alloys exhibited microstructure comprising austenite, martensite, carbides, and in situ TiC particles. The in situ formation of TiC particles consumed the carbon in the alloy and thus raised the martensite start temperature, resulting in a reduction in the mass fraction of austenite and an increase in the martensite. Among the four hardfacing alloys, the alloy with 5 wt.% Ti exhibited the highest hardness (836.3 HV0.2) and the best wear resistance due to its highest martensite mass fraction (69.97 wt.%). The matrix with in situ TiC particles and martensite effectively resisted the cutting of abrasive grains and the wear mechanism developed from the microplowing in 0Ti alloy to microcutting in in situ TiC-reinforced iron-based hardfacing alloys in abrasive wear tests. In dry sliding wear tests, TiC particles were released and slid on the surface of the alloys, resulting in the formation of grooves, while the formation of the tribochemical reaction layers contributed to a reduction in the friction coefficient and wear rate. This study provides a theoretical foundation for the development of "casing-friendly" hardbanding materials.
Keyword ：
Flux-cored arc welding Flux-cored arc welding Low-chromium iron-based hardfacing alloys Low-chromium iron-based hardfacing alloys In situ In situ Wear resistance Wear resistance TiC TiC
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| GB/T 7714 | Tong, Zhixiang , Shao, Wei , He, Chengxing et al. Microstructure and wear resistance of in situ TiC-reinforced low-chromium iron-based hardfacing alloys [J]. | WELDING IN THE WORLD , 2023 , 68 (3) : 605-620 . |
| MLA | Tong, Zhixiang et al. "Microstructure and wear resistance of in situ TiC-reinforced low-chromium iron-based hardfacing alloys" . | WELDING IN THE WORLD 68 . 3 (2023) : 605-620 . |
| APA | Tong, Zhixiang , Shao, Wei , He, Chengxing , He, Dingyong . Microstructure and wear resistance of in situ TiC-reinforced low-chromium iron-based hardfacing alloys . | WELDING IN THE WORLD , 2023 , 68 (3) , 605-620 . |
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Abstract ：
Thermal barrier coatings (TBCs) are widely used in the hot-section components of gas-turbine engines to allow operation at higher temperatures (> 1 200 degrees C), which has created some new issues. One issue is the spallation and premature failure of TBCs caused by calcium-magnesium-alumino-silicate (CMAS) deposits, which arise from entry of siliceous debris such as fly ash, sand, dust, and volcanic ash into engines. Since 1953, over 130 jet aircraft have encountered volcanic ash clouds, with varying degrees of damage and endangering the lives of many passengers. The 2010 eruption of Eyjafjallajokull volcano in Iceland led to the most severe air-traffic disruption since World War II. The operational response produced economic losses approaching 1.7 billion. When these debris enter the hot-section airfoil, they melt and are accelerated from low speed (similar to 15 m / s) to near supersonic speed (similar to 300 m / s), impacting and adhering to the TBC surface. Even with only a few molten silicate ash droplets adhering to the surface of hot-section airfoils, an initial deposit layer can form and large melt pockets (several cubic centimeters in volume) can accumulate. Such deposits can 1) block cooling holes and air flow paths, and 2) react with the top coating of hot-section airfoils. Furthermore, adhering droplets infiltrate the interior of TBCs under capillary forces. Due to the thermal gradient and thermal cycling, the infiltrated CMAS solidifies and fills in the microcracks, pores, and grain boundaries, resulting in loss of strain tolerance and increased coating stiffness. For traditional 7-8 wt.% yttria-stabilized zirconia (YSZ) material, chemical reaction with CMAS destroys the phase and structure stability. YSZ grains dissolve and Y-depleted ZrO2 grains precipitate due to the relatively low solubility of Zr4+ compared with Y3+ in melted CMAS. Upon cooling, the newly formed grains transform from tetragonal (t) to monoclinic (m) phases, accompanied by a 3%-4% volume expansion. As turbine inlet temperatures improve and industry production grows, TBCs are suffering from severe CMAS corrosion. This issue limits further application and development of TBCs; enhancing anti-corrosion performance of TBCs has become a concern. Herein, we compare the room-temperature and high-temperature properties of different CMAS and study the failure mechanism of TBCs exposed to CMAS. We also determine the most effective CMAS protection method. The results show that the chemical compositions, especially the Ca:Si ratio, of CMAS such as volcanic ash, dust and sand are different, further affecting their high-temperature viscosities and melting behaviors. With infiltration of molten CMAS toward the coating interior, chemical reaction occurs between them, resulting in instability of the coating microstructure and properties, and failure. Significant methods including inert-layer, rare-earth doping and novel materials have been proposed to improve the CMAS corrosion resistance of TBCs. The research and future development directions of CMAS corrosion and protection are proposed, providing a reference for design of novel TBCs.
Keyword ：
advanced aero-engines advanced aero-engines thermal barrier coatings(TBCs) thermal barrier coatings(TBCs) corrosion protection corrosion protection calcium-magnesium-alumino-silicate(CMAS) calcium-magnesium-alumino-silicate(CMAS)
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| GB/T 7714 | Wu, Yang , Guo, Xingye , He, Dingyong . Research Progress of CMAS Corrosion and Protection Method for Thermal Barrier Coatings in Aero-engines [J]. | CHINA SURFACE ENGINEERING , 2023 , 36 (5) : 1-13 . |
| MLA | Wu, Yang et al. "Research Progress of CMAS Corrosion and Protection Method for Thermal Barrier Coatings in Aero-engines" . | CHINA SURFACE ENGINEERING 36 . 5 (2023) : 1-13 . |
| APA | Wu, Yang , Guo, Xingye , He, Dingyong . Research Progress of CMAS Corrosion and Protection Method for Thermal Barrier Coatings in Aero-engines . | CHINA SURFACE ENGINEERING , 2023 , 36 (5) , 1-13 . |
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In this study, newly developed NiCrB and conventional NiCrTi coatings were produced by arc spraying using compressed air and nitrogen as atomization gases. In this way, four coatings with different oxide contents were produced. The coatings were investigated in terms of their phase compositions, oxygen contents, and microstructures. The results showed that the oxygen contents in coatings were pronouncedly reduced by nitrogen-atomized compared to air-atomized. The oxygen contents in the nitrogen-atomized coatings were about one-fourth of those in the corresponding air-atomized coatings, respectively. No significant oxide phases were observed in the XRD patterns of the nitrogen-atomized coatings. Moreover, the corrosion behavior of the coatings was studied using a hot corrosion test in molten Na2SO4-10 wt.% NaCl salt at T = 800 degrees C. All coatings were significantly corroded under this test condition. However, NiCrB coatings exhibited higher corrosion resistance than NiCrTi coatings. The NiCrB and NiCrTi coatings prepared by nitrogen atomization corroded more severely in the initial stage than the corresponding coatings prepared by air atomization. The NiCrB coating with air-atomized showed the best corrosion resistance due to the low chromium content and the addition of boron.
Keyword ：
NiCrB and NiCrTi coatings NiCrB and NiCrTi coatings microstructure microstructure oxide content oxide content arc spraying arc spraying hot corrosion hot corrosion
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| GB/T 7714 | Wang, Xu , He, Dingyong , Zhou, Zheng et al. Hot Corrosion Behavior of Arc-Sprayed NiCrB and NiCrTi Coatings with Different Oxide Contents [J]. | COATINGS , 2022 , 12 (4) . |
| MLA | Wang, Xu et al. "Hot Corrosion Behavior of Arc-Sprayed NiCrB and NiCrTi Coatings with Different Oxide Contents" . | COATINGS 12 . 4 (2022) . |
| APA | Wang, Xu , He, Dingyong , Zhou, Zheng , Shao, Wei , Guo, Xingye , Wang, Guohong . Hot Corrosion Behavior of Arc-Sprayed NiCrB and NiCrTi Coatings with Different Oxide Contents . | COATINGS , 2022 , 12 (4) . |
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Abstract ：
The Mo-10Si-(0, 5, 10, 15)B (at.%) alloys located in Moss (Mo solid solution) +Mo3Si +T2 (Mo5SiB2) region were prepared by arc melting. The effect of B content on the microstructure, microhardness, fracture toughness and oxidation resistance of the alloys was studied. In the Mo-10Si alloy, there are primary Mo-ss and peritectic Mo3Si phases. With the addition of B, (Mo-ss + T2) binary and (Mo-ss + T2 + Mo3Si) ternary eutectics emerge in Mo-10Si-(5, 10)B alloys. For Mo-10Si-15B alloy, primary Moss disappears and the mi-crostructure is only composed of binary and ternary eutectics. With the increase of B content, the proportion and grain size of Mo-ss decrease. The microhardness of alloys increases with the increase of B content due to the increasing intermetallics. The fracture toughness of alloys decreases obviously in single-edge notched three-point bending testing (SENB) and the fracture mode transforms from transgranular fracture to intergranular fracture because of the refinement of Mo-ss. In the high-temperature oxidation test at 1250 degrees C, the oxidation weight loss of the alloys decreases with the addition of B due to the densification of the borosilicate layer. (C) 2021 Elsevier B.V. All rights reserved.
Keyword ：
Microstructure Microstructure Oxidation resistance Oxidation resistance B content B content Mo-Si-B alloys Mo-Si-B alloys Fracture toughness Fracture toughness
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| GB/T 7714 | Jin, Ming , He, Dingyong , Shao, Wei et al. Influence of B contents on the microstructure, fracture toughness and oxidation resistance of Mo-Si-B alloys [J]. | JOURNAL OF ALLOYS AND COMPOUNDS , 2022 , 890 . |
| MLA | Jin, Ming et al. "Influence of B contents on the microstructure, fracture toughness and oxidation resistance of Mo-Si-B alloys" . | JOURNAL OF ALLOYS AND COMPOUNDS 890 (2022) . |
| APA | Jin, Ming , He, Dingyong , Shao, Wei , Tan, Zhen , Guo, Xingye , Zhou, Zheng et al. Influence of B contents on the microstructure, fracture toughness and oxidation resistance of Mo-Si-B alloys . | JOURNAL OF ALLOYS AND COMPOUNDS , 2022 , 890 . |
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Abstract ：
采用气雾化制粉技术原位合金化制备了AlSi10Mg-Er-Zr粉末,研究了选区激光熔化(SLM)成形AlSi10Mg-Er-Zr试样的相对密度、微观组织和力学性能。结果表明,SLM成形AlSi10Mg-Er-Zr试样的相对密度为99.20%,显微硬度为156.5 HV,室温抗拉强度达到461 MPa,屈服强度为304 MPa,相对于常规AlSi10Mg试样显微硬度提升了25.8%,抗拉强度和屈服强度分别提高了22.6%和26.7%。这是由于Er、Zr元素的加入,细化了SLM成形AlSi10Mg-Er-Zr试样的晶粒尺寸,并且使α-Al基体中Si元素的固溶度增加,由细晶强化和固溶强化机制共同作用...
Keyword ：
选区激光熔化 选区激光熔化 力学性能 力学性能 稀土元素 稀土元素 AlSi10Mg-Er-Zr合金 AlSi10Mg-Er-Zr合金 显微组织 显微组织
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| GB/T 7714 | 杨天野 , 崔丽 , 贺定勇 et al. 选区激光熔化AlSi10Mg-Er-Zr合金微观组织及力学性能强化 [J]. | 金属学报 , 2022 , 58 (09) : 1108-1117 . |
| MLA | 杨天野 et al. "选区激光熔化AlSi10Mg-Er-Zr合金微观组织及力学性能强化" . | 金属学报 58 . 09 (2022) : 1108-1117 . |
| APA | 杨天野 , 崔丽 , 贺定勇 , 黄晖 . 选区激光熔化AlSi10Mg-Er-Zr合金微观组织及力学性能强化 . | 金属学报 , 2022 , 58 (09) , 1108-1117 . |
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