激光粉末床熔融成形CuCrZr组织与性能研究  

Microstructure and Properties of CuCrZr Fabricated by Laser Powder Bed Fusion

作　　者：董鹏 汪洋 张立正 刘涵 张子佳 张京京 王润泽 DONG Peng;WANG Yang;ZHANG Lizheng;LIU Han;ZHANG Zijia;ZHANG Jingjing;WANG Runze(Capital Aerospace Machinery Co.,Ltd.,Beijing 100076,China;Beijing University of Technology,Beijing 100124,China;Beijing Engineering Research Center of 3D Printing for Digital Medical Health,Beijing 100124,China)

机构地区：[1]首都航天机械有限公司,北京100076 [2]北京工业大学,北京100124 [3]北京市数字化医疗3D打印工程技术研究中心,北京100124

出　　处：《航空制造技术》2024年第15期42-47,共6页Aeronautical Manufacturing Technology

摘　　要：采用激光粉末床熔融(L-PBF)成形技术制备CuCrZr合金复杂结构件。在最佳成形工艺参数下,制备了相对密度为99.65%的合金试样,并对L-PBF成形试样在不同方向的微观组织结构和性能进行研究。结果表明,XOY平面的显微组织为晶粒尺寸不一的等轴晶。XOZ平面的显微组织形貌显示柱状晶沿成形方向贯穿成形层生长,晶粒尺寸较大,且存在半圆形熔池。CuCrZr合金在XOY平面的显微硬度高于XOZ平面,拉伸试样的拉伸性能在XOY平面与XOZ平面存在轻微的差异。拉伸断口形貌均存在大量韧窝,是一种以塑性变形为主导的延性断裂。XOY平面的自由电子通过较粗柱状晶进行传输,晶界产生较少的散射作用。XOZ平面的自由电子通过垂直成形方向的等轴晶粒进行传输,晶界产生的散射作用较大,因此导致XOZ平面的导电率与热导率均低于XOY平面。CuCrZr alloy complex structural parts were prepared by laser powder bed fusion(L-PBF).Under the optimum forming process parameters,the alloy samples with relative density of 99.65%were prepared,and the microstructure and properties of L-PBF forming samples in different directions were studied.The results show that the microstructure of XOY plane is equiaxed grains with different grain sizes.The microstructure morphology of the XOZ plane shows that the columnar crystal grows through the forming layer along the forming direction,the grain size is large,and there are semi-circular molten pools.The microhardness of XOY plane of CuCrZr alloy is higher than that of XOZ plane,and the tensile property of tensile samples at XOY plane and XOZ plane is slightly different.There are a large number of dimples in the tensile fracture morphology,which is a ductile fracture dominated by plastic deformation.The free electrons in the XOY plane are transmitted through the coarser columnar crystals,and the grain boundaries produce less scattering.The free electrons in the XOZ plane are transmitted through the equiaxed grains perpendicular to the forming direction,and the scattering effect generated by the grain boundary is large,so the electrical conductivity and thermal conductivity of the XOZ plane are lower than those of the XOY plane.

关 键 词：激光粉末床熔融 CUCRZR合金 显微组织 力学性能 物理性能 

分 类 号：TG665[金属学及工艺—金属切削加工及机床] TG146.11[一般工业技术—材料科学与工程] V261[金属学及工艺—金属材料]