The　effects　of　quenching　temperature　on　microstructure　and　hardness　of　Fe-B-Al　alloy　were　investigated　by　optical　microscopy　(OM),　scanning　electron　microscopy　(SEM),　electron　probe　micro-analyzer　(EPMA),　X-ray　diffraction　(XRD),　and　Rockwell　hardness　test.　The　results　indicate　that　the　as-cast　microstructure　of　Fe-B-Al　alloy　consists　of　ferrite,　pearlite　and　the　netlike　boride　Fe2B　which　is　distributed　in　the　grain　boundary.　After　quenching　between　900　and　1100,　the　netlike　eutectic　borides　are　broken　up　and　the　breaking　tendency　increases　with　the　increasing　of　quenching　temperature.　After　quenching　at　1100,　the　matrix　transformed　to　martensite　and　the　netlike　boride　almost　totally　fractured.　When　quenching　at　900-1050,　the　hardness　is　fluctuating　between　37　and　39　HRC　but　changed　little.　However,　after　quenching　at　1100,　the　hardness　of　the　alloy　has　a　sharp　increase　to　54.1　HRC.　©,　2015,　Editorial　Office　of　Transactions　of　Materials　and　Heat　Treatment.　All　right　reserved.