(1. 華南理工大學(xué) 國(guó)家金屬材料近凈成形工程技術(shù)研究中心，廣州 510640；
2. 佛山市歲之博新材料科技有限公司，佛山 528247)
摘 要: 采用激光選區(qū)熔化(SLM)工藝成形Cu6AlNiSnInCe仿金合金，研究不同SLM工藝參數(shù)組合對(duì)試樣成形質(zhì)量及其組織和性能的影響。結(jié)果表明，根據(jù)SLM成形試樣的形貌特征可將激光功率和掃描速度的影響直觀地劃分為六個(gè)區(qū)域，分別是過熔區(qū)、完全熔化區(qū)、球化區(qū)、部分熔化區(qū)、嚴(yán)重球化區(qū)和未成形區(qū)。在完全熔化區(qū)時(shí)，激光能量密度達(dá)到156 J/mm3，仿金粉末在該參數(shù)區(qū)域完全熔化且熔池保持穩(wěn)定的狀態(tài)，試樣密度較高、表面質(zhì)量較好，表面粗糙度為9.2 μm；SLM試樣由基體α-Cu(Al Ni)相和彌散分布在基體中的析出δ-Cu41Sn11相組成；SLM試樣的抗變形能力、顯微硬度和耐腐蝕性能均優(yōu)于鑄造試樣。
關(guān)鍵字: 激光選區(qū)熔化；仿金合金；工藝優(yōu)化；組織；性能
（1. National Engineering Research of Net-Sharp Forming for Metallic Material, South China University of Technology, Guangzhou 510640, China;
2. Foshan Suizhibo New Materials Technology Co., Ltd., Foshan 528247, China）
Abstract: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 9.2 μm. SLM sample is composed of α-Cu(Al Ni) phase and δ-Cu41Sn11 phase which are distributed in the matrix. SLM specimens have better deformation resistance, microhardness and corrosion resistance than those of casting specimens.
Key words: selective laser melting; imitation gold alloy; process optimization; microstructure; performance
