【作者】 马煜林； 刘越； 江旭； 张莉萍； 刘春明；

【机构】 东北大学材料科学与工程学院；

【摘要】 奥氏体化工艺的温度为1050℃、1100℃、1150℃和1200℃,保温时间分别为1h、2h和4h,采取空冷、水冷和油冷的冷却方式,之后进行730℃回火2h处理。通过OM、SEM、TEM等方法观察材料的微观组织及析出相等。通过萃取的方法获得析出相粉末,再借助SEM、TEM和XRD等分析析出相成分。并对试样进行室温拉伸试验和硬度测试,对不同热处理条件下试样的性能进行对比分析。研究结果表明:试样在不同热处理条件下的组织均为马氏体组织。热处理工艺为1200℃保温4h水冷,再进行730℃保温2h的回火处理获得的马氏体板条更加致密,板条清晰,残余奥氏体较少组织均匀;M₂₃C₆和MX相尺寸较小并弥散分布;其抗拉强度、屈服强度分别为910MPa和830MPa,伸长率和断面收缩率分别达18.16%和57.49%,表现出具有较高的强度和良好的塑性及韧性。更多还原

【Abstract】 The temperature of the austenitizing process is 1050℃,1100℃,1150℃and 1200℃,the holding time is 1h,2h and 4h,and then were taken by air cooling,water cooling and oil cooling method,followed by 730℃tempered.Then observes the material microstructure and precipitation by OM,SEM,TEM and other methods.Precipitates powder obtained by extraction method then analysis the composition of precipitates by SEM,TEM,XRD and Raman spectra.And specimens at room temperature tensile test and hardness testing,the performance under different heat treatment conditions samples were analyzed.The results show that:the sample under different heat treatment conditions of the organization are martensite and a small amount ofδferrite.Heat treatment process for the 1150¹200℃heat 4h cooled,then tempered martensite laths 730℃for 2h to obtain a more compact,clear lath residual austenite less homogeneous,M₂₃C₆ and MX phase are smaller and dispersed.Tensile strength,yield strength of 910MPa and 830MPa,elongation and reduction of 18.16%and57.49%,respectively,exhibit high strength and good ductility and toughness.更多还原