热处理对增材制造TA15合金微观组织及力学性能的影响  

Effect of heat treatment on microstructure and mechanical properties of TA15 alloy fabricated by additive manufacturing

作　　者：慎松 杨来侠[1] 戴杰 谢启东 李庆宇 陈祯 SHEN Song;YANG Lai-xia;DAI Jie;XIE Qi-dong;LI Qing-yu;CHEN Zhen(College of Mechanical Engineering,Xi’an University of Science and Technology,Xi’an 710054,China;College of Mechanical Engineering,Xi’an Jiaotong University,Xi’an 710049,China;China Aviation Development Power Corporation,Xi’an 710016,China;National Institute Corporation of Additive Manufacturing,Xi’an 710018,China)

机构地区：[1]西安科技大学机械工程学院,陕西西安710054 [2]西安交通大学机械工程学院,陕西西安710049 [3]中国航发动力股份有限公司,陕西西安710016 [4]西安增材制造国家研究院有限公司,陕西西安710018

出　　处：《材料热处理学报》2024年第8期66-76,共11页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金青年基金(52005391);中国博士后科学基金(2019TQ0259)。

摘　　要：采用激光连续粉末床熔融技术制备了TA15(Ti-6.5Al-2Zr-Mo-V)合金试样,并对其进行了不同温度的正火处理。采用光学显微镜、扫描电镜、X射线衍射仪和拉伸试验等研究了热处理温度对TA15合金试样显微组织和力学性能的影响。结果表明:当热处理温度从700℃升高到950℃时,TA15合金试样晶粒尺寸明显增大,KAM角度差明显减小,伸长率明显增加,抗拉强度和屈服强度降低,当热处理温度(1050℃)超过合金的相变温度后,会有β相生成,伸长率又会再次降低。与直接成形试样相比,经过950℃热处理后,试样的室温伸长率提升超过93%,500℃高温伸长率提升超过63.8%,基本满足了其在航空航天领域的使用需求。TA15(Ti-6.5Al-2Zr-Mo-V)alloy samples were prepared using laser continuous powder bed fusion technology and subjected to normalizing treatment at different temperatures.The effect of heat treatment temperature on microstructure and mechanical properties of the TA15 alloy samples was studied using optical microscope,scanning electron microscopy,X-ray diffraction and tensile testing.The results show that when the heat treatment temperature increases from 700℃to 950℃,the grain size of the TA15 alloy samples significantly increases,the KAM angle difference significantly decreases,the elongation significantly increases,and the tensile strength and yield strength decrease.When the heat treatment temperature(1050℃)exceeds the phase transition temperature of the alloy,theβphase will be formed and the elongation will decrease again.Compared with the directly manufactured sample,after heat treatment at 950℃,the room temperature elongation of the sample increases by more than 93%,and the high temperature elongation at 500℃increases by more than 63.8%,which basically meets its usage requirements in the aerospace field.

关 键 词：TA15钛合金 激光连续粉末床熔融 热处理 力学性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]