Hot cracking, grains size, crystal orientation and compressive strength of an equimolar CoCrFeMnNi high-entropy alloy (HEA) printed by selective laser melting (SLM) were investigated. The CoCrFeMnNi HEA printed by SLM suffered from hot cracking no matter of the employed printing parameters. The preferred orientation of the printed sample was transformed in the order: 〈2 3 3〉→〈0 0 1〉→〈2 0 3〉→〈1 0 1〉, as the volumetric energy density (VED) rises. Also, the increased VED favors the grain growth and the increase of the grain orientation spread, owing to the presence of high temperature gradient and larger residual stress. The fracture strength increases with the VED, and the maximum compressive strength rises to 2447.7 MPa, but the elongation rate is still 77.6% due to the ultrafine microstructure. The results of this study have reference value for the preparation of HEA materials with controllable grain characteristics, crystalline texture and complex structures by SLM.

研究了通过选择性激光熔融（SLM）印刷的等摩尔CoCrFeMnNi高熵合金（HEA）的热裂纹，晶粒尺寸，晶体取向和抗压强度。无论采用何种印刷参数，由SLM印刷的CoCrFeMnNi HEA均会发生热裂。随着体积能量密度（VED）的升高，印刷样品的优选方向按以下顺序变换：<2 3 3>→<0 0 1>→<2 0 3>→<1 0 1>。而且，由于存在高温梯度和较大的残余应力，增加的VED有利于晶粒生长和晶粒取向扩展的增加。断裂强度随VED的增加而增加，最大抗压强度升至2447.7 MPa，但由于具有超细微结构，其伸长率仍为77.6％。