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利用激光熔化沉积技术制备Ti-6.5Al-3.5Mo-1.5Zr-0.3Si钛合金板材,并采用金相和扫描电镜对合金的宏观组织和微观组织进行表征,对室温拉伸性能进行研究。结果显示:宏观形貌由贯穿多个沉积层的大柱状晶组成;观察到宽条带和窄条带2种条带,宽条带由α板条和魏氏集束构成,窄条带由α板条和β转变组织构成,对条带的形成机理进行探讨。此外,还讨论由后续沉积层的沉积导致的热效应对组织演变的影响。室温拉伸测试显示,激光熔化沉积制备的Ti-6.5Al-3.5Mo-1.5Zr-0.3Si钛合金的强度达到锻件强度水平。
The Ti-6.5Al-3.5Mo-1.5Zr-0.3Si titanium alloy plate was prepared by laser melting deposition technique. The microstructure and microstructure of Ti-6.5Al-3.5Mo-1.5Zr-0.3Si alloy were characterized by metallographic examination and scanning electron microscopy. The results show that the macroscopic morphology consists of large columnar crystals that run through multiple sedimentary layers. Wide and narrow bands are observed. The wide bands consist of α-lath and Weisner’s bundle. The narrow bands consist of α Laths and β-transformation of the composition of the formation of the band to explore. In addition, the effect of thermal effects caused by the subsequent deposition of deposits on the microstructure evolution is also discussed. Tensile tests at room temperature showed that the strength of Ti-6.5Al-3.5Mo-1.5Zr-0.3Si titanium alloy prepared by laser melting deposition reached the level of forging strength.