摘要
以TC4球形粉末为原料,采用激光沉积制造技术制备TC4钛合金厚壁件。通过光学显微镜(OM)、扫描电子显微镜(SEM)、X射线衍射(XRD)等方法研究了退火处理对激光沉积制造TC4显微组织及力学性能的影响。结果表明:试样经α+β两相区退火处理后,显微组织为网篮组织,经β单相区退火后,组织转变为魏氏组织;退火试样力学性能仍存在各向异性:Z向试样强度较低,塑性较好,而XY向试样强度高,塑性较差,退火温度对试样的各向异性具有明显影响;XY向试样拉伸性能存在较明显的分散性;α+β两相区退火处理后两个方向上均为韧性断裂,β单相区退火处理后试样强度与塑性大幅下降,且XY向试样为脆性断裂。
TC4 titanium alloy bulk specimens were prepared by laser deposition manufacturing.The effect of annealing treatment on mechanical properties,microstructure of LDMed TC4 titanium alloy was studied by optical microstructure(OM),scanning electron microscopy(SEM)and X-ray diffraction(XRD).The experimental results show that the microstructure is basketweave structure afterα+βtwo-phase region annealing treatment and is transformed to Widmanstatten structure afterβphase region annealing treatment.The mechanical properties still show significant anisotropy after annealing:Z-direction samples exhibit low strength and high plasticity,while XY-direction samples show high strength and low plasticity.The samples have a greatly decrease in strength and plasticity afterβphase region annealing treatment.The annealing temperature has obvious influence on the anisotropy of the samples.The tensile properties of XY-direction samples are evidently scattered.Both direction samples exhibit ductile fracture afterα+βtwo-phase region annealing treatment.The strength and plasticity of the samples decrease greatly afterβsingle phase region annealing treatment,and the XY-direction samples are brittle fracture.
作者
钦兰云
何晓娣
李明东
杨光
高博文
QIN Lan-yun;HE Xiao-di;LI Ming-dong;YANG Guang;GAO Bo-wen(Key Laboratory of Fundamental Science for National Defence of Aeronautical Digital Manufacturing Process,Shenyang Aerospace University,Shenyang 110136,China;School of Chemical Equipment,Shenyang University of Technology,Liaoyang 111003,Liaoning,China)
出处
《材料工程》
EI
CAS
CSCD
北大核心
2020年第2期148-155,共8页
Journal of Materials Engineering
基金
国家重点研发计划项目(2016YFB1100504)
国家自然科学基金资助项目(51505301)
工信部民用飞机专项科研项目(MJZ-2016-G-71)
关键词
激光沉积制造
TC4钛合金
退火温度
显微组织
力学性能
laser deposition manufacturing
TC4 titanium alloy
annealing temperature
microstructure
mechanical property
