TC4钛合金锻造/SLM增材组合制造结合区组织调控与力学行为研究  

Microstructure Control and Mechanical Behavior of Bonding Zone of TC4 Titanium Alloy Fabricated by Forging/SLM Combined Manufacturing

作　　者：王舒 王志敏[1] 钱婷婷 步贤政[1] 陈博 陈浩 尤逢海 WANG Shu;WANG Zhimin;QIAN Tingting;BU Xianzheng;CHEN Bo;CHEN Hao;YOU Fenghai(Beijing Hangxing Machinery Manufacturing Corporation,Beijing 100013,China;Beijing Yuding Additive Manufacturing Research Institute Co.,Ltd.,Beijing 100096,China)

机构地区：[1]北京航星机器制造有限公司,北京100013 [2]北京煜鼎增材制造研究院有限公司,北京100096

出　　处：《新技术新工艺》2021年第9期70-75,共6页New Technology & New Process

基　　金：国家重点研发计划资助项目(2018YFB1106000);国防基础科研计划资助项目(JCKY2017204A021)。

摘　　要：采用在锻造TC4钛合金上激光选区熔化增材制造TC4钛合金的组合制造工艺方法,制备了锻造/激光选区熔化增材组合制造TC4钛合金组织,在退火热处理状态下研究了锻造/激光选区熔化增材组合制造TC4钛合金结合区的组织特征和力学行为。结果表明:经过780℃×2 h的退火热处理后,锻造/激光选区熔化增材组合制造TC4钛合金结合区可观察到一条清晰连续的界线,界线两侧显微组织分别呈典型锻造TC4钛合金、激光选区熔化增材制造TC4钛合金组织特征,无逐渐变化的特征。界面区域组织致密,与锻造或激光选区熔化增材制造TC4钛合金相比,未表现出更多微观缺陷。在拉伸位移方向平行于界面方向的条件下,锻造/激光选区熔化增材组合制造TC4钛合金结合区的屈服强度、抗拉强度低于激光选区熔化增材制造区域,高于锻造区域。在一定程度上展现了TC4钛合金锻造/激光选区熔化增材组合制造工艺方法的应用潜力。It was introduced that a manufacturing process method of TC4 titanium alloy by selective laser melting additive on forged TC4 titanium alloy,and TC4 titanium alloy structure was prepared with forging/laser selective melting additive combined manufacturing.The microstructure and mechanical properties of bonding zone of TC4 titanium alloy fabricated by the combined manufacturing method were studied under annealing condition.The results showed that after 780℃×2 h annealing,a clear and continuous boundary could be observed in the bonding zone of TC4 titanium alloy fabricated by forging/laser selective melting additive combined manufacturing.The microstructure on both sides of the boundary presented the characteristics of typical forging TC4 titanium alloy and laser selective melting additive TC4 titanium alloy respectively,without gradual change.The structure of boundary area was dense and compared with TC4 titanium alloy made by forging or selective laser melting additive combined manufacturing,there was no tendency of more micro defects.When the tensile displacement direction was parallel to the interface direction,the yield strength and tensile strength of TC4 titanium alloy bonding zone were lower than those of fabricated by LSM additive,but higher than those of fabricated by forging.To a certain extent,it showed the application potential of forging/laser selective melting additive combined manufacturing process of TC4 titanium alloy.

关 键 词：组合制造 激光选区熔化增材制造 锻造 界面 TC4钛合金 航天 

分 类 号：TG146.1[一般工业技术—材料科学与工程]