张少驰,孙中刚,梁祖磊,张文书,陈小龙,常辉.粉末特性及热处理对激光选区熔化钛合金组织演变的影响[J].稀有金属材料与工程,2019,48(10):3234~3240.[zhangshaochi,sunzhonggang,liangzulei,zahngwenshu,chenxaiolong,changhui.Effect of powder properties and heat treatment on microstructure evolution of selective laser melted titanium alloy[J].Rare Metal Materials and Engineering,2019,48(10):3234~3240.]
粉末特性及热处理对激光选区熔化钛合金组织演变的影响
投稿时间:2018-03-26  修订日期:2018-04-17
中文关键词:  粉末特性  激光选区熔化  微观组织  热处理
基金项目:
中文摘要:
      通过粉末筛粉和混合制得到不同粒度分布的钛合金粉末,研究了粉末物理特性对选区激光熔化(SLM,selective laser melting)打印质量、沉积态及热处理后微观组织的影响。结果表明,细粉比例增加,粉末中值粒径下降,流动性下降,松装密度变化不显著;三种粉末粒径打印后,致密度均在99%以上,表面粗糙度随细粉增加粗糙度下降,细粉量在23%时,孔隙率最小;成型后沉积态组织横截面为初生β晶粒,内部为针状α′马氏体,纵截面可见明显柱状晶;热处理表明,α′马氏体600-800℃分解,且在800℃时α+β片层变粗,热处理时应严格控制退火温度和时间,避免片层粗化,影响性能。
Effect of powder properties and heat treatment on microstructure evolution of selective laser melted titanium alloy
英文关键词:powders properties  selective laser melteing  microstructure  heat treatment
英文摘要:
      The effects of physical properties of powders on the quality of selective laser melted(SLM) components, deposition state and microstructure after heat treatment were studied using different particle size distribution of titanium alloy powder obtained by powder screening and mixing. The results show that the increase in the proportion of fine powder, powder median size decreased, fluidity decreases and the bulk density did not change significantly; the density of parts manufactured by three kinds of powder particle size was more than 99%, the surface roughness increases with the increase of fine powder; quantity of fine powder in 23%, the minimum porosity formed after deposition; the microstructure of cross section of primary grain, internal acicular martensite, the longitudinal section of the visible columnar crystal; heat treatment results show that the decomposition of martensite at 600-800℃, and alpha + beta layer thicker at 800℃, heat treatment should be strictly controlled the annealing temperature and time to avoid layers coarse and impact performance.
作者单位E-mail
张少驰 南京工业大学 zhangshaochi@njtech.edu.cn 
孙中刚 南京工业大学 sunzgg@njtech.edu.cn 
梁祖磊 南京工业大学  
张文书 南京工业大学  
陈小龙 南京工业大学  
常辉 南京工业大学  
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