Microstructures and mechanical properties of Ti-6Al-3Nb-2Zr-Mo alloy fabricated by electron beam rapid manufacturing
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摘要: 试验采用电子束熔丝快速成形方法(EBRM)制备了Ti-6Al-3Nb-2Zr-Mo合金试样，研究了EBRM Ti6321合金化学成分、显微组织、力学性能及冲击韧性. 结果表明，该合金在熔丝成形中Al元素烧损1.0%左右，且合金内部没有元素偏析. EBRM Ti6321合金显微组织为沿沉积高度方向生长、晶贯穿多个沉积层的粗大柱状晶，柱状晶内部以α片层为主. EBRM Ti6321合金x向和z向的室温抗拉强度各项异性系数为2.6%，断裂方式均为韧性断裂. x向和z向冲击韧性均不低于80 J，各向异性系数为3.1%；冲击断口有大量的韧窝，为典型的韧性断裂.Abstract: The Chemical compositions, microstructure, mechanical properties, toughness of Ti6321 alloy made by electron beam rapid manufacturing (EBRM) were studied. The 1% of Al in the solder wire was burned during the manufacturing process, and no element segregation was found. The as-built microstructures exhibit large columnar grains, which grew epitaxially along the height direction of deposits through many deposition layers. The columnar grain is mainly composed of α lamellae. As a result, the anisotropic coefficient of tensile strength is 2. 6%. Dimple are observed on fractured tensile specimens in both X and Z directions. The impact toughness of X and Z direction is not less than 80J, and the anisotropic coefficient of toughness is 2.6%. The impact fracture is typical ductile fracture, which consists of a large number of dimples.
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表 1 EBRM Ti6321 合金拉伸性能
Table 1 Tensile properties of EBRM Ti6321 samples
类别 抗拉强度
Rm/MPa屈服强度
Rp0.2/MPa断后伸长率
A(%)断后收缩率
Z(%)水平方向 748.7 657.7 13.3 46 竖直方向 729 642 12.7 44 各向异性 2.6% 2.3% 4.5% 4.3% 
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表 2 EBRM Ti6321室温冲击韧性
Table 2 Impact toughness of EBRM Ti6321 samples
类别 冲击吸收能量 AKV/J 水平 83.3 竖直 86 各向异性 3.1%
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