淬回火工艺对建筑用20MnSi钢组织与力学性能的影响  

Effects of Quenching and Tempering Process on Microstructure and Mechanical Properties of 20MnSi Steel for Building

作　　者：范成伟[1] FAN Chengwei(School of Civil Engineering,Wuchang Institute of Technology,Wuhan 430065,China)

机构地区：[1]武昌工学院土木工程学院,湖北武汉430065

出　　处：《热加工工艺》2021年第8期109-111,共3页Hot Working Technology

基　　金：国家自然科学基金青年项目(51609081);武昌工学院资助重点项目(2015KYZ02)。

摘　　要：利用光学显微镜、拉伸试验机等研究了不同淬回火工艺对20MnSi钢显微组织与力学性能的影响。结果表明:经920℃淬火后,20MnSi试验钢的组织为板条状马氏体。当淬火温度升高到960℃时,组织中马氏体发生粗化。在840~960℃,随着淬火温度的升高,试验钢强度先升高后降低,920℃淬火试验钢的强度达到最大值。在420~620℃,随着回火温度的升高,试验钢的强度、屈强比逐渐降低,伸长率逐渐升高。经920℃淬火+420℃回火处理的20MnSi钢强度达到900 MPa,伸长率、屈强比满足使用要求,为理想的淬回火工艺。The effects of different quenching and tempering processes on the microstructure and mechanical properties of 20MnSi steel were studied by means of optical microscopy and tensile tester.The results show that the microstructure of 20MnSi steel quenched at 920℃is lath martensite.When the quenching temperature rises to 960℃,the martensite in the microstructure coarsens.At 840-960℃,with the increase of quenching temperature,the strength of the test steel increases at first and then decreases,and the strength of the test steel quenched at 920℃reaches the maximum.At 420-620℃,with the increase of tempering temperature,the strength and yield ratio of the test steel decrease gradually,and the extension rate increases gradually.The strength of 20MnSi steel quenched at 920℃and tempered at 420℃is 900 MPa,the elongation and yield ratio meet the requirements of application,and it is an ideal quenching and tempering process.

关 键 词：20MNSI钢 淬火 回火 力学性能 

分 类 号：TG161[金属学及工艺—热处理]