Effect of Tempering Temperature on Microstructure and Mechanical Properties of 0Cr16Ni5Mo Martensitic Stainless Steel
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摘要: 通过光学显微镜(OM)、扫描电镜(SEM)、X射线衍射分析(XRD)和力学性能测试,研究了回火温度对0Cr16Ni5Mo马氏体不锈钢组织和性能的影响。结果表明,试验钢在450—700℃温度区间回火处理后的组织均为回火马氏体+残余奥氏体+δ-铁素体,随着回火温度的升高,韧化相残余奥氏体含量先增加后降低,在600℃其含量达到最大值29.8%。其强度则随着回火温度的升高先降低然后回升,在600℃回火后强度最低,而伸长率变化趋势与强度相反;不同温度回火后的冲击断口均呈韧窝状,撕裂棱清晰可见,断裂方式均为韧性断裂。
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关键词:
- 0Cr16Ni5Mo马氏体不锈钢 /
- 回火温度 /
- 残余奥氏体 /
- 组织 /
- 力学性能
Abstract: Effects of tempering temperature on microstructure and mechanical properties of 0Cr6Ni5Mo martensitic stainless steel were studied by means of optical microscope,scanning electron microscopy,XRD and mechanical property test.The results show that the microstructure of the tempered steel temperated at temperature of 450—700 ℃ is composed of tempered martensite,retained austenite and δ-ferrite.With the increase of tempered temperature,the contents of retained austenite first increase and then decrease,which reaches a maximum of 29.8% at 600 ℃.While the strength of the steel first decreases sharply and then increases,reaches the lowest point at 600 ℃.All impact fracture morphology of specimens after tempered at different temperatures exhibits dimple pattern with features of plastic fracture,the tear ridge is clearly visible. -
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