激光选区熔化成形S136模具钢的成形性能研究  

Microstructure and property of S136 mould steel fabricated by selective laser melting

作　　者：文世峰[1] 吴雪良 周燕[1,2] 魏青松 Wen Shifeng1 Wu Xueliang1 Zhou Yan1,2 Wei Qingsong1(1 State Key Laboratory of Material Processing and Die and Mould Technology, Huazhong University of Science and Technology, Wuhan 430074, China; 2 Sehool of Mechanical and Electrical Engineering, Wuhan Institute of Technology, Wuhan 430205, Chin)

机构地区：[1]华中科技大学材料成形与模具技术国家重点实验室,湖北武汉430074 [2]武汉工程大学机电工程学院,湖北武汉430205

出　　处：《华中科技大学学报（自然科学版）》2018年第2期51-55,共5页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(51605176,51375189);国家高技术研究发展计划资助项目(2015AA042501);湖北省科技支撑计划资助项目(2014BAA017);武汉市关键技术攻关计划资助项目(2015010202010088)

摘　　要：采用激光选区熔化（SLM）技术成形了S136模具钢,对其相组成、微观组织、磨损性能、硬度及腐蚀行为等进行了研究.研究结果表明：水平成形方向上（正面）,裂纹易于在熔化道附近产生并垂直于熔化道,因较大冷却速度产生了大量细小的针状马氏体组织,从而有较高的显微硬度（688.20 HV3）,在滑动摩擦过程中形成了黏附层,磨损率较低（5 590？m3/（N·m））,在Fe Cl3溶液中发生了均匀腐蚀;而在垂直成形方向上（侧面）,裂纹则垂直于SLM层-层堆积方向,显微硬度较低（649.04 HV3）,磨损率为25 840？m3/（N·m）,在腐蚀液中发生了层间腐蚀.上述结果进一步证实了SLM成形试样存在各向异性.最后,SLM成形了具有复杂的随形冷却流道的模具镶块,注塑应用表明采用该镶块可提升注塑冷却效率25%,降低注塑生产周期20%.S136 mould steel was manufactured by selective laser melting（SLM）. The phase composition, microstructure,micro-hardness,wear properties and corrosion behavior were investigated.The results show that the samples built horizontally（top surface） contains large numbers of fine needle-like martensite,resulting in higher micro-hardness（688.20 HV3）.Cracks tend to occur near and pendicular to the melting tracks.The lowest wear rate（5 590 ？m3/（N·m）） are obtained in horizontal build samples.In the vertical build samples（side surface）,lower micro-hardness（649.04 HV3） and higher wear rate（25 840 ？m3/（N·m）） are obtained.The cracks are perpendicular to the building direction.In the Fe Cl3 solution,general corrosion occur for horizontal build samples while layer corrosion appear for vertical build samples.Results above show that SLM samples exhibit anisotropy in this study.The SLM technology is proved to manufacture mould insert with complex conformal cooling channel.Injection mould applications show that the use of the inserts can enhance the injection cooling efficiency by 25%,and reduce the injection production cycle by 20%.

关 键 词：激光选区熔化 S136模具钢 显微硬度 摩擦磨损 腐蚀 

分 类 号：TN249[电子电信—物理电子学] TF124[冶金工程—粉末冶金]