Purpose

The purpose of this paper is to examine the effect of internal pores on the tensile properties of a Co–Cr–Mo alloy fabricated by selective laser melting (SLM).

Design/methodology/approach

The size and volume fraction of pores were controlled through high temperature annealing (HTA) and hot isostatic pressing (HIP).

Findings

After HTA, the size and fraction of pores decreased compared with the as-built SLM sample, and no pores were observed after HIP. Tensile tests of the HTA and HIP samples showed nearly similar tensile deformation behavior. From the results, the authors found that the size of the internal pores formed in the SLM process had little effect on the tensile properties. The as-built SLM sample had less elongation than the HTA and HIP samples, which would not the effect of porosity, but rather the effect of the residual stress and the retained ε phase after the SLM process.

Originality/value

Although pores are a main factor that influence the mechanical properties, the effect of pores on the tensile properties of Co–Cr–Mo alloys fabricated by SLM has not been studied. Therefore, in this study, the effect of pores on the tensile properties of a Co–Cr–Mo alloy fabricated by SLM was studied.

中文翻译：

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内孔对激光选区熔炼钴铬钼合金拉伸性能的影响

目的

本文的目的是研究内部孔隙对通过选择性激光熔化 (SLM) 制造的 Co-Cr-Mo 合金的拉伸性能的影响。

设计/方法/方法

通过高温退火（HTA）和热等静压（HIP）控制孔的尺寸和体积分数。

发现

HTA后，与SLM样品相比，孔隙的大小和比例有所下降，HIP后未观察到孔隙。HTA 和 HIP 样品的拉伸试验显示出几乎相似的拉伸变形行为。从结果中，作者发现在 SLM 过程中形成的内部孔隙的大小对拉伸性能几乎没有影响。竣工的 SLM 样品的伸长率低于 HTA 和 HIP 样品，这不会受到孔隙率的影响，而是受到 SLM 工艺后残余应力和残留 ε 相的影响。

原创性/价值

虽然气孔是影响力学性能的主要因素，但气孔对 SLM 制备的 Co-Cr-Mo 合金拉伸性能的影响尚未研究。因此，在本研究中，研究了孔隙对 SLM 制造的 Co-Cr-Mo 合金拉伸性能的影响。