Laser-based powder bed fusion of 16MnCr5 and resulting material properties
Laser-based powder bed fusion of 16MnCr5 and resulting material properties
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DOI：
10.1016/j.addma.2020.101372
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发表时间：
2020-10-01
影响因子：
11
通讯作者：
Reinhart, Gunther
中科院分区：
文献类型：
--
作者：
Schmitt, Matthias;Kamps, Tobias;Reinhart, Gunther
基于激光的粉末床融合（LPBF）已经发展成为齿轮原型和小规模生产的制造技术。通常使用表面硬化钢16 MnCr 5，并且其材料特性是众所周知的。然而，所得到的材料性能后LPBF工艺序列，如残余应力退火，表面硬化和硬质精加工是广泛未知的。本文介绍了在EOS M270型LPBF机上加工16 MnCr 5达到99.5%以上相对密度的研究。对所得材料的显微组织和硬度进行了检查。此外，抗拉强度以及特定的齿根承载能力进行了研究。将结果与通过连续铸造的常规加工材料进行比较。结果表明，残余应力退火广泛补偿材料的各向异性以下的LPBF过程。与传统材料相比，在竣工状态下材料硬度提高了21%。与常规材料相比，表面硬化行为显示了所得表面硬化深度的差异。在表面硬化后在表面处测量的残余应力显示出压应力。脉动器测试提供应力循环（S-N）曲线，从该曲线可以得出齿根承载能力。
Laser-based Powder Bed Fusion (LPBF) has evolved to a manufacturing technology for prototype and small scale production of gears. The case hardening steel 16MnCr5 is typically used and its material properties are well known and understood. However, the resulting material properties following the post-LPBF process sequence such as residual stress annealing, case hardening and hard finishing are widely unknown. This paper presents a study of processing 16MnCr5 with an EOS M270 LPBF-machine reaching 99.5 % relative density and above. The resulting microstructure and hardness of the material is examined. Furthermore, the tensile strength as well as the gear-specific tooth root carrying capacity are studied. The results are compared to a conventionally processed material via continuous casting. It is shown that residual stress annealing widely compensates material anisotropy following the LPBF process. Material hardness in the as-built condition is increased up to 21 % compared to a conventional material. The case hardening behavior shows a difference in the resulting case hardening depth in comparison to conventional material. The residual stresses measured at the surface after the case hardening show compressive stresses. Pulsator tests deliver a stress-cycle (S-N) curve from which the tooth root carrying capacity can be derived.