【摘要】 本文采用选择性激光熔融法制备了Ti-5Al-5Mo-5V-1Cr-1Fe近β钛合金,并研究了Ti-5Al-5Mo-5V-1Cr-1Fe合金在打印过程的组织演变和力学性能。Ti-5Al-5Mo-5V-1Cr-1Fe合金组织为近β钛合金(相含量大于98.1%)且在β晶粒内部存在大量亚微米级的晶胞组织,β柱状晶平行于构建方向。扫描间距、扫描功率等选择性激光熔融工艺参数显著影响Ti-5Al-5Mo-5V-1Cr-1Fe合金的微观组织和力学性能。制备的Ti-5Al-5Mo-5V-1Cr-1Fe合金屈服强度为818 MPa,伸长率超过19%,表明选择性激光熔融法是一种有潜力的近β钛零件制造技术。更多还原

【Abstract】 In this work, a near-beta Ti-5 Al-5 Mo-5 V-1 Cr-1 Fe titanium alloy was fabricated by selective laser melting(SLM), and the microstructure evolution together with the mechanical properties was studied. The as-fabricated alloy showed columnar β grains spreading over multiple layers and paralleling to the building direction. The distinct microstructure of as-fabricated alloy was composed of near-β(more than 98.1 %) with a submicron cellular structure. Different SLM processing parameters such as hatch spacing could affect the microstructure of as-fabricated alloy, which could thus further significantly affect the mechanical properties of as-fabricated alloy. In addition, the as-fabricated alloy with the distinct microstructure exhibits yield strength of 818 MPa combined with elongation of more than 19 %, which shows that SLM is a potential technology for manufacturing near-beta titanium components.更多还原