论文部分内容阅读
研究了激光立体成形TA15钛合金沉积态、退火态、固溶时效态以及双固溶时效态4种状态的组织及力学性能。结果表明:沉积态组织为大量不同取向相互交叉的发达魏氏α+β板条,其拉伸性能表现出一定的各向异性。经退火后,显微组织没有明显变化,塑性在强度降低不多的情况下得到了提高。退火态试样具有良好的综合拉伸性能,达到了锻件退火态的拉伸性能标准。经固溶时效处理后可得到粗化的α初+α’组织,成形件的强度显著提高。经双固溶时效后可得到粗化α初+细化α次+α’组织,强度稍有降低。与室温相比,4种状态均呈现出高温强度降低而塑性提高的特点。对于不同的热处理状态,成形试样的洛氏硬度HRC处于30~45范围变化,不同热处理态的硬度变化与拉伸性能中的强度变化趋势一致。
The microstructures and mechanical properties of TA15 titanium alloy deposited, annealed, solution-treated and double-solution aged were studied. The results show that a large number of developed Weisstein α + β laths with different orientations cross each other in the as-deposited microstructure, and the tensile properties show some anisotropy. After annealing, no significant changes in the microstructure, plasticity in the case of reduced intensity was improved. Annealed samples have a good comprehensive tensile properties, reached the tensile properties of forgings annealed state standards. After aging treatment solution can be obtained coarse α primary α ’organization, the strength of the molded parts increased significantly. Coagulation solution aging can be obtained after the first coarsening α + α + α ’organization, the intensity slightly reduced. Compared with the room temperature, the four states showed the characteristics of high temperature strength decreased plasticity. For different heat treatment conditions, the HRC of the formed samples varied from 30 to 45, and the change trend of hardness in different heat treatment states was consistent with that in tensile properties.