激光选区熔化成形TC4合金的β转变温度  

β-transus temperature of selective laser melted TC4 alloy

作　　者：杨晶晶[1] 喻寒琛 韩婕[1] 殷杰[1] 王泽敏[1] 曾晓雁[1] 

机构地区：[1]华中科技大学武汉光电国家实验室,湖北武汉430074

出　　处：《材料热处理学报》2016年第9期80-85,共6页Transactions of Materials and Heat Treatment

基　　金：国家"863"计划项目(2013AA031606)

摘　　要：分别借助计算法和差热分析法,测量了激光选区熔化(SLM)成形TC4合金的α+β/β相转变温度,最后通过热处理验证了转变温度的准确性。结果表明:SLM成形的TC4合金由原柱状β晶粒和与生长方向呈大约±45°的针状马氏体组成。它的α+β/β相转变温度约为980℃,与铸造和锻造TC4钛合金的β转变温度相近。证明了TC4合金的α+β/β转变温度只与成分相关,与成形工艺和显微组织状态无关。β-transus temperature of selective laser melting（SLM） TC4 alloy was measured by calculation and differential scanning calorimetry（DSC） methods,and a post heat treatment was conducted to verify the β-transus temperature.The results show that the microstructure of the SLMed TC4 alloy consists of columnar prior β grains filled with a large number of fine acicular martensites oriented at approximately ± 45 ° with the grain growth direction.The β-transus temperature of the SLMed TC4 alloy is about 980 ℃,which is consistent with that of the TC4 alloy produced by traditional technology.Therefore,the β-transus temperature of TC4 alloy is sensitive to chemical composition and irrelative to the processing technology and microstructure.

关 键 词：增材制造 钛合金 相变 差热分析 

分 类 号：TG146.2[一般工业技术—材料科学与工程]