We successfully used CoCrW alloy as the feedstock for directly shaping wear-resistant products by additive manufacturing. We present a guideline for forming substantive, high-density, crack-free CoCrW alloys via laser metal deposition (LMD) and evaluated the relationship between the microstructure and mechanical properties. CoCrW alloy with a scale of several tens of cubic centimeters has not been previously reported because the brittle material undergoes cracking due to residual stresses. Densification and crack suppression were achieved by controlling the oxygen concentration in an Ar atmosphere and preheating the base plate to 400 °C. The tensile strength (MPa) of the LMDed CoCrW alloy was 1492 ± 141 along the scan direction, 1464 ± 234 along the overlap direction, and 1359 ± 72 along the build direction. The overlap direction had almost the same strength as the scan direction. In the microtensile test for the overlap direction, the fracture ratio in the overlap region was only 17.4%, and it was found that softening in this region did not contribute to the decrease in strength.

中文翻译：

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利用激光金属沉积法增材制造的CoCrW合金的组织和力学性能

我们成功地将CoCrW合金用作通过增材制造直接成型耐磨产品的原料。我们提出了通过激光金属沉积（LMD）形成大量，高密度，无裂纹的CoCrW合金的指南，并评估了微结构与力学性能之间的关系。先前尚未报道过具有数十立方厘米规模的CoCrW合金，因为脆性材料由于残余应力而开裂。通过控制Ar气氛中的氧气浓度并将基板预热至400°C，可以实现致密化和抑制裂纹。LMDed CoCrW合金的抗拉强度（MPa）在扫描方向上为1492±141，在重叠方向上为1464±234，在构建方向上为1359±72。重叠方向具有与扫描方向几乎相同的强度。在重叠方向的微拉伸试验中，重叠区域的断裂率仅为17.4％，发现该区域的软化对强度降低没有贡献。