热处理工艺对高锰钢组织和硬度的影响  

Effect of Heat Treatment Process on Microstructure and Hardness of High Manganese Steel

作　　者：罗飞翔 段振虎 伍伟玉 LUO Feixiang;DUAN Zhenhu;WU Weiyu(Jiangxi Copper Technology Research Insititute Co.,Ltd.,Nanchang 330096,China)

机构地区：[1]江西铜业技术研究院有限公司,江西南昌330096

出　　处：《铜业工程》2023年第6期117-122,共6页Copper Engineering

摘　　要：本文研究了水韧处理和时效处理对高锰钢组织和硬度的影响,采用激光共聚焦显微镜和X射线衍射仪(XRD)对其组织进行分析,采用显微硬度计测试其维氏硬度值。研究结果表明:水韧处理后的组织为奥氏体和少量的碳化物,当保温时间较短时,碳化物固溶不完全,随着保温时间的延长,碳化物完全溶解,奥氏体晶粒发生长大;相较于铸态组织硬度HV461.6,水韧处理后组织硬度降到HV229.9。随着时效温度的升高和保温时间的延长,首先会在奥氏体晶界处析出针状碳化物,然后这些针状碳化物会向晶粒内部长大,同时会在晶界处析出点状碳化物;随着时效温度的升高,显微硬度值逐渐增大,且在显微组织发生明显改变时,试样的显微硬度发生突增;当保温时间由1h增至3h时,试样的显微硬度值大都有所增加,但当时效温度为300℃和350℃时,试样的显微硬度值相差不大。The effect of water toughening and aging treatment on the microstructure and hardness of high manganese steel was studied,the microstructure was analyzed by confocal laser microscopy and X-ray diffraction(XRD),the Vickers hardness was measured by mi‐crohardness tester.The results show that the microstructure after water toughening is austenite and a small amount of carbide,when the holding time was short,the carbide dissolved incomplete,with the holding time extended,the carbide completely dissolved,austenite grains grow;Compared with the as-cast structure hardness of HV 461.6,the microstructure hardness after water toughening treatment decreased to HV 229.9.With the increase of aging temperature and the extension of holding time,needle-like carbides will be precipi‐tated at the austenite grain boundary first,then these needle-like carbides will grow into the grain interior,and point-like carbides will be precipitated at the grain boundary;With the increase of aging temperature,the microhardness value increased gradually,and when the microstructure changed obviously,the microhardness value of the sample increased suddenly;When the holding time increased from 1 h to 3 h,the microhardness of the sample mostly increased,but the microhardness of the aging temperature 300℃and 350℃had little difference.

关 键 词：高锰钢 水韧处理 时效处理 显微组织 硬度 

分 类 号：TG15[金属学及工艺—热处理]