Microstructure and mechanical properties of additively manufactured CoCrW alloy using laser metal deposition
Microstructure and mechanical properties of additively manufactured CoCrW alloy using laser metal deposition
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DOI：
10.1007/s40194-020-00926-y
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发表时间：
2020-06
影响因子：
2.1
通讯作者：
Masashi Miyake;T. Matsuda;T. Sano;A. Hirose;Yasutomo Shiomi;M. Sasaki
中科院分区：
文献类型：
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作者：
Masashi Miyake;T. Matsuda;T. Sano;A. Hirose;Yasutomo Shiomi;M. Sasaki
我们成功地将CoCrW合金作为原料，采用增材制造技术直接成型耐磨产品。提出了一种通过激光金属沉积（LMD）成形致密、高密度、无裂纹CoCrW合金的指导方针，并评估了显微组织与力学性能之间的关系。数十立方厘米尺度的CoCrW合金，由于脆性材料在残余应力作用下发生开裂，以前未见报道。通过控制氩气中的氧气浓度，并将基板预热至400℃，实现了致密化和裂纹抑制。合金的抗拉强度（MPa）沿扫描方向为1492±141，沿重叠方向为1464±234，沿构建方向为1359±72。重叠方向与扫描方向强度基本一致。在重叠方向的微拉伸试验中，重叠区域的断裂率仅为17.4%，并且发现该区域的软化并没有导致强度的降低。
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.