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利用激光增材制造技术,分别在扫描速率为3、4、5 mm/s的条件下制备出Ti-22Al-25Nb合金薄壁试样,分析了3组试样的相组成、显微组织和力学性能。结果表明,激光增材制造Ti-22Al-25Nb合金显微组织由B2、O和α2相组成,随着扫描速率的增加,合金析出相体积分数和基体B2相平均晶粒尺寸呈现出减小趋势,合金室温、高温抗拉强度逐渐升高。扫描速率为5 mm/s时,所沉积材料的室温和750℃高温的抗拉强度最高,分别为1053 MPa和665 MPa;析出相体积分数和B2相平均晶粒尺寸最小,分别为72.52%和156μm。
The thin-wall Ti-22Al-25Nb thin-walled samples were prepared by using the laser additive manufacturing technology at a scanning rate of 3, 4 and 5 mm / s respectively. The phase composition, microstructure, Mechanical properties. The results show that the microstructure of Ti-22Al-25Nb alloy is composed of B2, O and α2 phases. With the increase of scan rate, the volume fraction of precipitated phase and the average grain size of matrix phase B2 show a decreasing trend , Alloy room temperature, high temperature tensile strength gradually increased. When the scan rate is 5 mm / s, the tensile strength of the deposited materials is the highest at room temperature and 750 ℃, respectively, 1053 MPa and 665 MPa; the volume fraction of precipitates and the average grain size of B2 phase are the smallest, which are 72.52% and 156 μm.