退火处理对激光沉积制造TC4钛合金组织及力学性能影响EI北大核心CSCD

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。

Effect of annealing treatment on microstructures and mechanical properties of TC4 titanium alloy manufactured by laser deposition

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.