4Cr5Mo2NiV钢的等温疲劳性能研究  

Study on isothermal fatigue behavior of 4Cr5Mo2NiV steel

作　　者：曾艳 吴晓春[1,2,3] 左鹏鹏[1,2,3] ZENG Yan;WU Xiao-chun;ZUO Peng-peng(State Key Laboratory of Advanced Special Steel,Shanghai University,Shanghai 200444,China;Shanghai Key Laboratory of Advanced Ferrous Metallurgy,Shanghai University,Shanghai 200444,China;School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China)

机构地区：[1]上海大学省部共建高品质特殊钢冶金与制备国家重点实验室,上海200444 [2]上海大学上海市钢铁冶金新技术开发应用重点实验室,上海200444 [3]上海大学材料科学与工程学院,上海200444

出　　处：《模具工业》2019年第12期36-41,共6页Die & Mould Industry

基　　金：“十三五”国家重点研发计划项目（2016YFB0300402）

摘　　要：基于拉压对称的机械应变控制模式,研究了4Cr5Mo2NiV钢的等温疲劳性能,并采用光学显微镜(OM)和扫描电子显微镜(SEM)对材料的损伤和微观组织进行观察分析。试验结果表明:等温疲劳过程中,4Cr5Mo2NiV的应力-应变滞后回线均呈中心对称分布,随着机械应变幅的增大,材料滞后回线的面积增大,材料的损伤程度增加,等温疲劳寿命缩短。The isothermal fatigue properties of 4 Cr5 Mo2 NiV steel was studied based on the uniaxial loading strain-controlled tests at a constant temperature, and the damage and microstructure of the material after the tests was observed and analyzed by optical microscopy(OM) and scanning electron microscopy(SEM). The experimental results showed that the stress-strain hysteresis loops of 4 Cr5 Mo2 NiV were centrosymmetrical during isothermal fatigue, and with the increase of mechanical strain amplitude, the area of hysteresis loops increased, the damage degree of materials increased, and the isothermal fatigue life decreased.

关 键 词：4Cr5Mo2NiV 压铸模具钢 等温疲劳 滞后回线 

分 类 号：TG162.4[金属学及工艺—热处理]