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1、深冷及回火处理对高速钢M42组织及力学性能影响摘要：采用金相显微镜、扫描电镜及硬度仪，研究了-196℃深冷处理与常规热处理工艺组合对M42高速钢微观组织及硬度的影响，所采用的组合工艺包括：淬火＋深冷处理，淬火＋深冷处理＋回火，淬火＋回火＋深冷处理.结果表明：淬火后深冷处理24h的工艺能明显细化晶粒，提高M42高速钢的硬度，促进残余奥氏体向马氏体转变及碳化物析出并弥散分布，并改变了马氏体的形态.在回火前对M42钢进行深冷处理可降低二次硬化回火温度，峰值温度由525℃降至450℃，硬度值为998.2HV，较未深冷处理提高了5.0%.回火后深冷
2、处理工艺对M42高速钢组织及硬度的影响不明显.�关键词：M42高速钢；深冷处理；回火；二次硬化；峰值温度�中图分类号：TG156.91文献标识码：AStudyoftheMicrostructureandPropertiesofDeepCryogenic�TreatmentandTemperingonM42High�speedSteel��
18CHENGang���1��，WANGQiong�shuang�1，HANJi�chu�2,ZHOUMing�zhe�2,GUOXi�ru�2�(1.CollegeofMaterialsScienc
3、eandEngineering,HunanUniv,Changsha,Hunan410082,China;�2.BichampCuttingTechnology(Hunan)Co,Ltd,Changsha,Hunan410200,China)Abstract:TheeffectsofdeepcryogenictreatmentindifferentholdingtimescombinedwiththetraditionalHSSheattreatmentprocessesonthemicrostructureandhardnessofM4
4、2HSSwereinvestigatedwithmetallurgicalmicroscope,SEMandHerveyhardnesstester.Theprocessincluded:quenching+deepcryogenictreatment,quenching+deepcryogenictreatment+temperingandquenching+tempering+deepcryogenictreatment.Theresultshaveshownthatdeepcyogenicteatmentin24hafterquen
5、chingcanobviouslyrefinegrainsize,improvethehardnessofM42HSS,andsignificantlypromotethetransformationofretainedaustenitetomartensiteandtheprecipitationofdispersiondistributioncarbide,andmeanwhile18resultinthechangeoftheshapeofmartensitewhichisdifferentfromtheconventionalhe
6、attreatment.Deepcryogenictreatmentbeforetemperingcanreducethetemperatureofsecondaryhardening,wherethepeaktemperaturedeclinedto450℃comparedwith525℃oftheprocesswithoutthedeepcryogenictreatment.Thehardnessofsecondaryhardeningpeakis998.2HV,whichis5%higherthanthatoftheprocessw
7、ithoutthedeepcryogenictreatment.TheeffectofdeepcryogenictreatmentaftertemperingonthemicrostructureandthehardnessofM42HSSisnotobvious.�Keywords:M42HHS;cryogenic;tempering;secondaryhardening;peaktemperature��M42(W2Mo9Cr4VCo9)为超硬型高速钢系列中最有代表性的牌号，在刀具材料系列中具有不可替代的地位��［1］�18.该钢种常
8、用于双金属带锯条齿部材料，而这种切削工具的主要失效形式为磨损.一方面由于此种磨损不像其他刀具具有可磨性，属于一次性刀具.另一方面由于现代生产方式和经济因素的影响，切削方式基本为高速强力切削，对
