摘要
基于高温均质化不同温度、时间和锻造变形比,研究了不同大颗粒共晶碳化物尺寸下Cr8Mo1SiV冷作模具钢的冲击韧性和耐磨性能,并采用光学显微镜、扫描电子显微镜和Image-J软件对材料的显微组织和大颗粒共晶碳化物进行了观察分析。试验结果表明:Cr8Mo1SiV冷作模具钢大颗粒共晶碳化物尺寸可由高温均质化和锻造工艺控制,高温均质化的温度越高、时间越长,大颗粒共晶碳化物的尺寸越小,提高温度的效果优于延长时间,高温均质化的温度工艺优选1 180℃左右,温度过高则使晶粒粗大、晶界熔化,温度过低则效果不显著,时间在保证晶粒度符合要求且无过热的前提下尽量延长,锻造变形比越大,则大颗粒共晶碳化物的破碎程度越大、尺寸越小、材料的冲击韧性及其稳定性越高,锻造变形比优选>16。
The impact toughness and wear resistance of Cr8Mo1SiV cold working die steel with different large particle eutectic carbide sizes were studied based on high temperature homogenization at different temperatures, times and forging deformation ratios. The microstructures and large particle eutectic carbides of the material were observed and analyzed by optical microscope, scanning electron microscope and Image-J software. The results showed that the size of large particle eutectic carbides in Cr8Mo1SiV cold working die steel could be controlled by high temperature homogenization and forging process. The higher the temperature was and the longer the time of the high temperature homogenizationwas, the smaller the size of large eutectic carbides was. The effect of increasing temperature was better than prolonging time. The optimum temperature process for high temperature homogenization was about 1 180 ℃. The longer the time was and the larger the forging deformation ratio was, the greater the breakage degree of large eutectic carbides and the smaller the size was, the higher the impact toughness and stability of materials was. It preferred 16 for forging deformation ratio.
作者
吴红庆
宁辉
胡峰荣
刘迎骥
张建
吴晓春
WU Hong-qing;NING Hui;HU Feng-rong;LIU Ying-ji;ZHANG Jian;WU Xiao-chun(School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China;Jiangyou Changcheng Special Steel Co.,Ltd.,Pangang Group,Jiangyou,Sichuang 621701,China;State Key Laboratory of Advanced Special Steel,Shanghai University,Shanghai 200444,China)
出处
《模具工业》
2019年第12期42-46,63,共6页
Die & Mould Industry
基金
“十三五”国家重点研发计划项目（2016YFB0300403）
