| 激光选区熔化成形S136模具钢热处理组织和性能研究 |
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| 引用本文： | 朱学超,魏青松,孙春华.激光选区熔化成形S136模具钢热处理组织和性能研究[J].粉末冶金技术,2019,37(2):83-90. |
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| 作者姓名： | 朱学超 魏青松 孙春华 |
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| 作者单位： | 1.苏州市职业大学机电工程学院, 苏州 215104 |
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| 基金项目： | 国家自然科学基金资助项目51375189国家高技术研究发展计划资助项目2015AA042501 |
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| 摘 要： | 激光选区熔化是非平衡凝固过程，成形过程会产生热应力及组织应力，造成金属零件开裂、变形等缺陷，后期热处理是改善激光选区熔化金属零件微观组织和提升性能的有效手段。本文研究了后期热处理参数（热处理温度、保温时间及冷却方式）对激光选区熔化成形的S136模具钢零件微观组织和性能的影响。结果表明:最优热处理参数为1050℃，保温30 min，水冷。在最优热处理工艺下S136模具钢试样洛氏硬度达到HRC 53.7，比热处理之前提高了8.6%，洛氏硬度标准差比热处理之前降低了37.14%，硬度均匀性得到显著改善；试样的耐磨性、最大显微硬度和最大弹性模量比热处理前分别提升33.5%、3.3%和8.6%；试样的熔池形态鳞状形貌结构消失，碳化物相CrFe7C0.45溶解，组织均匀，基本呈现各向同性特征。
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| 关 键 词： | 激光选区熔化 热处理 硬度 耐磨性 微观组织 |
| 收稿时间： | 2018-05-19 |
Study on microstructures and properties of S136 die steel formed by selective laser melting after heat treatment |
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| Affiliation: | 1.School of Mechanic and Electronic Engineering, Suzhou Vocational University, Suzhou 215104, China2.State Key Laboratory of Material Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan 430074, China |
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| Abstract: | Selective laser melting (SLM) is a non-equilibrium solidification process and can cause the thermal and structural stress, resulting in the cracking and deformation of metal parts. Post-heat treatment is an important way to improve the microstructures and properties of SLM metal parts. The effects of post-heat treatment parameters on microstructures and properties of S136 die steel formed by SLM were investigated in this paper, including heat treatment temperature, holding time, and cooling mode. In the results, the optimal heat treatment parameters are found as 1050℃, 30 min, and water cooling. Rockwell hardness is found up to HRC 53.7, increasing by 8.6% than that of as-formed sample. The uniformity of hardness is greatly improved as the standard deviation of Rockwell hardness decreased by 37.14%. The wear resistance, maximum micro-hardness, and maximum elastic modulus of heat treated sample are increased by 33.5%, 3.3% and 8.6%, respectively. The scaly structure morphology of molten pool is disappeared, CrFe7C0.45 carbide is dissolved, and the uniform and isotropic microstructures are present. |
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