基板预热、重熔、预烧结对激光选区熔化Ti-47Al-2Cr-2Nb裂纹形成的影响  

Effect of Substrate Preheating,Remelting,In-situ Presintering on Crack Formation of Ti-47Al-2Cr-2Nb Fabricated by Selective Laser Melting

作　　者：石学智 黄赟锋 李振华 冯武卫 马树元[2] Shi Xuezhi;Huang Yunfeng;Li Zhenhua;Feng Wuwei;Ma Shuyuan(School of Marine Engineering Equipment,Zhejiang Ocean University,Zhoushan 316022,China;School of Mechanical Engineering,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]浙江海洋大学海洋工程装备学院,浙江舟山316022 [2]北京理工大学机械与车辆学院,北京100081

出　　处：《稀有金属材料与工程》2022年第8期2739-2744,共6页Rare Metal Materials and Engineering

基　　金：Zhoushan Science and Technology Project (2019C21014);National Natural Science Foundation of China (51875042)。

摘　　要：为了抑制激光选区熔化(SLM)制备Ti-47Al-2Cr-2Nb合金时裂纹的形成,研究了基板预热、重熔和预烧结等方法对裂纹形成和表面质量的影响。结果表明,基板预热、重熔和预烧结可以在一定程度上减少裂纹的形成,致密度提高了1.71%~4.34%;重熔有助于改善表面质量,但会明显降低生产效率;另外,基板预热与预烧结相结合,能更有效地防止裂纹的产生,致密度超过99%。The methods of substrate preheating, remelting and in-situ presintering were proposed to fabricate Ti-47Al-2Cr-2Nb by selective laser melting(SLM). The effects of these approaches on the formation of cracks and surface quality were investigated. The results indicate that substrate preheating, remelting and in-situ presintering powder can reduce the formation of cracks to a certain extent, and the density is increased by 1.71%~4.34%. Remelting contributes to improvement of the surface quality but greatly reduces the productivity. In addition, the combination of substrate preheating and in-situ presintering can effectively prevent the occurrence of cracks, and the density is over 99%.

关 键 词：基板预热 重熔 预烧结 裂纹 表面 激光选区熔化(SLM) 

分 类 号：TG146.23[一般工业技术—材料科学与工程]