回火参数对G95Cr18马氏体不锈钢显微组织及力学性能的影响  

Effect of tempering parameters on microstructure and mechanical properties of G95Cr18 martensitic stainless steel

作　　者：刘永宝 周丽娜 刘明 高翔 石东丹 Liu Yongbao;Zhou Lina;Liu Ming;Gao Xiang;Shi Dongdan(AECC Harbin Bearing Co.,Ltd.,Harbin Heilongjiang 150025,China)

机构地区：[1]中国航发哈尔滨轴承有限公司,黑龙江哈尔滨150025

出　　处：《金属热处理》2023年第7期103-111,共9页Heat Treatment of Metals

摘　　要：利用光学显微镜(OM)、扫描电镜(SEM)及X射线衍射仪(XRD)研究了回火参数对G95Cr18钢微观组织的影响;同时利用维氏硬度计、电子万能试验机及落锤冲击试验机等研究了不同回火温度及次数对其硬度、拉伸性能及冲击性能的影响。结果表明,随着回火温度的升高,G95Cr18钢残留奥氏体含量呈逐渐减少趋势,由于碳分配效应导致热稳定性增加,回火温度为200℃时,残留奥氏体分解量≤3.6%,当回火温度升高至≥400℃,残留奥氏体含量可满足<6%;随着回火温度升高,G95Cr18钢硬度呈现先降低后升高现象,二次硬化温度为400℃;随着回火温度的升高,G95Cr18钢的冲击吸收能量呈现先增加后减小的趋势,回火温度为300℃时,冲击吸收能量达到最大值,为7.1 J;当回火温度≤300℃时,增加回火次数对G95Cr18钢微观组织及强韧性影响不大;当回火温度达500℃时,增加回火次数会降低G95Cr18钢的综合性能。Effect of tempering parameters on microstructure of the G95Cr18 steel was investigated by means of OM,SEM and XRD.In addition,the effects of different tempering temperatures and times on hardness,tensile properties and impact property were studied by using Vickers hardness tester,electronic universal testing machine and drop hammer impact testing machine.The results show that the retained austenite content of the G95Cr18 steel decreases gradually with the increase of tempering temperature.When the tempering temperature is 200 ℃,the decomposition amount of retained austenite is less than 3.6%,which is caused by the increase of thermal stability due to the carbon partitioning effect.When the tempering temperature is higher than 400 ℃,the retained austenite content can meet the requirement of6%.The hardness of the G95Cr18 steel first decreases and then increases with the increase of tempering temperature,and the secondary hardening temperature is 400 ℃.With the tempering temperature increasing,the impact absorbed energy of the G95Cr18 steel increases first and then decreases.When the tempering temperature is 300 ℃,the impact absorbed energy reaches the maximum,which is 7.1 J.When the tempering temperature is lower than 300 ℃,increasing tempering times has little effect on the microstructure and strength and toughness of the G95Cr18 steel.When the tempering temperature reaches 500 ℃,the comprehensive properties of the G95Cr18 steel decreases with tempering times increasing.

关 键 词：G95Cr18不锈钢 回火 残留奥氏体 显微组织 力学性能 

分 类 号：TH133.33[机械工程—机械制造及自动化] TG142.1[一般工业技术—材料科学与工程]