SLM成形Cu6AlNiSnInCe仿金合金的工艺优化及其组织与性能

Process optimization,microstructure and properties of SLM forming Cu6AlNiSnInCe imitation gold alloy

采用激光选区熔化(SLM)工艺成形Cu6AlNiSnInCe仿金合金,研究不同SLM工艺参数组合对试样成形质量及其组织和性能的影响。结果表明,根据SLM成形试样的形貌特征可将激光功率和扫描速度的影响直观地划分为六个区域,分别是过熔区、完全熔化区、球化区、部分熔化区、严重球化区和未成形区。在完全熔化区时,激光能量密度达到156 J/mm3,仿金粉末在该参数区域完全熔化且熔池保持稳定的状态,试样密度较高、表面质量较好,表面粗糙度为9.2μm;SLM试样由基体α-Cu(Al Ni)相和弥散分布在基体中的析出δ-Cu41Sn11相组成;SLM试样的抗变形能力、显微硬度和耐腐蚀性能均优于铸造试样。

The Cu6AlNiSnInCe imitation gold alloy was fabricated by selective laser melting(SLM).The influences of different process parameters on the forming quality,microstructure and properties of samples were investigated.The results show that the effects of laser power and scanning speed can be divided into six zones according to the morphological characteristics of as-built samples,named fusion zone,completely melting zone,balling zone,partly melting zone,severely balling zone and unformed zone.The laser energy density reaches 156 J/mm3 in the completely melting zone.The imitation gold powder is completely melted and the molten pool remains stable.The as-built sample has high density and good surface quality with a surface roughness of 9.2μm.SLM sample is composed ofα-Cu(Al Ni)phase andδ-Cu41Sn11 phase which are distributed in the matrix.SLM specimens have better deformation resistance,microhardness and corrosion resistance than those of casting specimens.