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激光选区熔化成形TiB2增强S136模具钢

Selective Laser Melting of TiB2-Reinforced S136 Die Steels

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摘要

利用激光选区熔化(SLM)工艺成形TiB2/S136复合材料,研究了激光体能量密度η对SLM成形试样致密度、微观组织及力学性能的影响。采用X射线衍射仪、场发射扫描电镜、透射电镜等研究成形试样物相成分、表面形貌及微观组织。结果表明:当η过低时,粉末熔化不完全,形成大量残余孔隙;而当η过高时,受热应力影响,成形试样存在微裂纹。当η=66.7 J/mm3时,成形试样表面缺陷少,致密度高达97.3%,存在细化的、分布均匀的等轴晶,其平均显微硬度高达742.4 HV0.1,平均摩擦系数和磨损率分别为0.5593和0.272×10-4 mm3·N-1·m-1,耐磨性能优异,抗拉强度达到1051.3 MPa,延伸率为5.84%,塑性较好。因此,SLM成形TiB2/S136复合材料的最佳η为66.7 J/mm3,η过高或过低,均会严重影响TiB2/S136复合材料的致密度及力学性能,该研究为SLM成形高性能模具钢材料提供了有益的理论和工艺借鉴。

Abstract

The selective laser melting (SLM) technology is used to process the TiB2/S136 composites and the effect of laser energy density η on the densities, microstructures and mechanical properties of SLM-processed specimens is investigated. X-ray diffraction instrument, field emission scanning electron microscopy and transmission electron microscopy are used to study the phase compositions, surface morphologies and microstructures of specimens. The results show that, when η is low, the powders are not fully molten and thus a large amount of residual pores are formed. However, when η is too high, the micro-cracks are formed in the specimens because of thermal stress. When η is 66.7 J/mm3, the specimens have less surface defects, their densities are up to 97.3%, and there exist fine and uniformly-distributed equiaxed grains. As for these specimens, the average micro-hardness is up to 742.4 HV0.1, and the average friction coefficient and wear rate are 0.5593 and 0.272×10-4 mm3·N-1·m-1, respectively, indicating an excellent abrasion resistance performance. The tensile strength is 1051.3 MPa and the elongation is 5.84%, indicating a relatively good plasticity. Above all, the optimal η for the SLM-processed TiB2/S136 composites is 66.7 J/mm3, and if η is too high or too low, the densities and mechanical properties of TiB2/S136 composites would be seriously affected. This study provides a useful theoretical basis and a process guidance for SLM-processed high-performance die steels.

Newport宣传-MKS新实验室计划
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中图分类号:TG142.1

DOI:10.3788/cjl201845.1202010

所属栏目:激光制造

基金项目:国家863计划(2015AA042501)

收稿日期:2018-05-07

修改稿日期:2018-07-09

网络出版日期:2018-08-24

作者单位    点击查看

胡辉: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

联系人作者:文世峰(royal_wen@163.com)

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引用该论文

Hu Hui,Zhou Yan,Wen Shifeng,Wei Qingsong. Selective Laser Melting of TiB2-Reinforced S136 Die Steels[J]. Chinese Journal of Lasers, 2018, 45(12): 1202010

胡辉,周燕,文世峰,魏青松. 激光选区熔化成形TiB2增强S136模具钢[J]. 中国激光, 2018, 45(12): 1202010

被引情况

【1】田健,魏青松,朱文志,党明珠,文世峰. Cu-Al-Ni-Ti合金激光选区成形工艺及其力学性能. 中国激光, 2019, 46(3): 302001--1

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