回火处理对硼钢显微组织及性能的影响

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中图分类号：TH117.1 文献标识码：A 文章编号：2095-5553（2026）04-0090-06

Abstract：Aimingat thelowwear resistanceof soilcontact parts ofagricultural machinery，theefectof toughness on the wearresistance of 22MnB5stelwasstudied bytempering.Theresultsshow thatthe lath martensitecharacteristicsof 2MnB5 steel gradually vanish after "quenching+tempering treatment".Withthe increaseof tempering temperature，the saturatedcarbon inmartensitegraduallprecipitated，thefinecarbideparticlesincreasedanddistributedevenly，andthe internal stress decreased，resulting inthedecreaseof hardnessand theimprovementof impact toughness.The hardness and impact toughness of 22MnB5 steel after tempering at 470°C are 305HV0.3 and 105J⋅cm-2 ，respectively，and the wear loss is 3.73mg ，which shows the best wear resistance.The 470°C tempering treatment effectivelyrelieves the surfacestress，reduces theprobabilityofcrack initiation，reduces thewear andspalingof the material surface，and improvesthewearresistanceofthestel.The wear mechanism changes from significant abrasive wear，adhesive wear and fatigue wear to slight abrasive wear and fatigue wear.

Keywords：tempering treatment；impact toughness；fatigue wear；22MnB5 steel.

0 引言

农业机械触土部件（如犁铧、圆盘耙）在土壤中作业时，复杂的作业环境易导致耕作部件因磨损、腐蚀和冲击作用而失效，严重影响农机的使用寿命。（剩余11492字）