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铬对激光选区熔化成形模具钢性能的影响

Effect of Cr on Performance of Mold Steel Fabricated by Selective Laser Melting

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摘要

采用激光选区熔化技术制备了不同Cr含量的S136模具钢试样, 研究分析了Cr含量对成形试样组织和性能的影响。结果表明, Cr的添加使试样中孔洞、裂纹等缺陷的数量增大, 致密度减小; 随着Cr含量的增大, 试样中马氏体含量先减小后增大; Cr能够细化晶粒, Cr的含量越大, 试样的组织越细小, 但硬度越小; Cr的添加使试样表面生成了致密的钝化膜, 增强了试样的耐腐蚀性能, 但当Cr的含量较大时, 裂纹数量的增加使得试样的耐腐蚀性能减弱。

Abstract

The S136 mold steel samples with different Cr contents are fabricated by the selective laser melting (SLM) technique and the effect of Cr content on microstructures and performances of mold steels is investigated. The results show that the addition of Cr makes the numbers of voids, cracks and other defects in samples increase, which results in the reduction of relative density. With the increase of Cr content, the martensite content in the samples decreases first and then increases. Benefitting from the refinement of Cr, the higher the Cr content, the finer the microstructures of the samples, but the smaller the microhardnesses. The addition of Cr can generate a dense passivation film on the surface of samples to improve their anti-corrosion resistance. However, when the Cr content is too high, the corrosion resistance is reduced due to the increasing number of cracks.

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中图分类号:TG142.45

DOI:10.3788/lop55.091402

所属栏目:激光器与激光光学

基金项目:国家高技术研究发展计划(2015AA042501)

收稿日期:2018-03-22

修改稿日期:2018-03-28

网络出版日期:2018-04-02

作者单位    点击查看

季宪泰: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
陈柯宇: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
周燕: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中国地质大学(武汉)工程学院, 湖北 武汉 430074
文世峰: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
魏青松: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
陈志平:广东科龙模具有限公司, 广东 佛山 528303

联系人作者:文世峰(royal_wen@163.com); 季宪泰(jixiantai@163.com);

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引用该论文

Ji Xiantai,Chen Keyu,Zhou Yan,Wen Shifeng,Wei Qingsong,Chen Zhiping. Effect of Cr on Performance of Mold Steel Fabricated by Selective Laser Melting[J]. Laser & Optoelectronics Progress, 2018, 55(9): 091402

季宪泰,陈柯宇,周燕,文世峰,魏青松,陈志平. 铬对激光选区熔化成形模具钢性能的影响[J]. 激光与光电子学进展, 2018, 55(9): 091402

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