对加入镍或钴元素的4Cr5Mo2V钢热疲劳性能的研究  

Study on thermal fatigue properties of 4Cr5Mo2V steel after adding nickel or cobalt

作　　者：张宇[1,2] 计杰 张恒华[1,2] 吴晓春[1,2] ZHANG Yu;JI Jie;ZHANG Heng-hua;WU Xiao-chun(State Key Laboratory of Advanced Special Steel,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]上海大学材料科学与工程学院,上海200444

出　　处：《模具工业》2019年第12期17-21,27,共6页Die & Mould Industry

基　　金：国家重点研发计划项目（2016YFB0300404）

摘　　要：以4Cr5Mo2V钢及分别含1%Ni、Co的4Cr5Mo2V钢为研究对象,在自制的热疲劳试验装置中进行热疲劳试验。研究分别加入1%Co或Ni对4Cr5Mo2V钢的热疲劳性能的影响,探索熔损+热疲劳的综合作用,利用超景深显微镜、扫描电镜、EDS能谱分析等对试样表面的形貌、组织和成分进行了分析。结果表明:加入钴和镍有利于减轻熔损;熔损早期没有产生,裂纹早期出现于15~45μm的表面氧化层中;含1%Co的4Cr5Mo2V钢基体表面裂纹密度较小,凹陷状区域较均匀,硬度稳定性较好,其热疲劳性能最好。Taking 4Cr5Mo2V steel, 4Cr5Mo2V steel with 1%Ni, 4Cr5Mo2V steel with 1%Co as the research objects, and carried out thermal fatigue test on the self-made thermal fatigue experimental device. The effect of adding 1%Co or Ni on the thermal fatigue properties of4Cr5Mo2V steel was studied, and the comprehensive effect of melt loss + thermal fatigue was explored. The morphology, structure and composition of the surface of the sample were analyzed by means of ultra-deep-field microscopy, scanning electron microscopy and EDS spectroscopy.The results showed that the addition of cobalt and nickel was beneficial to reduce the melt loss;No melt loss occurred early, and cracks appeared in the surface oxide layer ranging from 15~45 μm. The surface crack density of 4Cr5Mo2V steel with 1% Co was smaller, the concave area was more uniform, the hardness stability was better,and the thermal fatigue performance was the best.

关 键 词：热作模具钢 4Cr5Mo2V钢 压铸模 氧化层 热疲劳性能 

分 类 号：TG162.4[金属学及工艺—热处理]