扫描方式和退火热处理对激光快速成形TA15钛合金组织与性能的影响

Effect of Scanning Pattern and Annealing Heat Treatment on Microstructures and Mechanical Properties of TA15 Titanium Alloy Formed by Laser Rapid Forming Process

摘要:

分别采用单向扫描和编织扫描方式，激光快速成形了两个TA15钛合金厚壁零件，研究了扫描方式、退火热处理对TA15钛合金组织和拉伸力学性能的影响。结果表明，激光快速成形TA15钛合金具有良好的金相组织热稳定性。编织扫描方式可显著细化TA15钛合金的金相组织，与单向扫描方式制备的TA15钛合金相比，编织扫描方式制备的TA15钛合金具有更高的力学性能。两种扫描方式制备的TA15钛合金，其沉积态和热处理态的拉伸性能具有各向异性，经940 ℃/1 h/AC热处理后，两种扫描方式制备的 TA15钛合金沿水平方向和垂直方向的拉伸力学性能均超过TA15钛合金退火锻件的力学性能标准。

Abstract:

Two thick-wall parts of TA15 alloy were formed by laser rapid forming (LRF) process using unidirectional scanning pattern and weaving scanning pattern, respectively. The investigation on the effect of scanning pattern and heat treatment on the microstructures and the tensile properties of the LRFed TA15 alloy was carried out. Results show that the LRFed TA15 alloy has a good thermal stability of metallographic microstructures. The tensile properties of TA15 alloy formed by the weaving scanning pattern are superior to that of TA15 alloy fabricated by the undirectional scanning pattern due to finer metallographic microstructures of TA15 alloy obtained by the weaving scanning pattern. The tensile properties of as-deposited and heat-treated TA15 alloy prepared by the both scanning patterns are anisotropic, after the heat treatment of 940 °C/1 h/AC，the tensile properties of the formed TA15 alloy are better than that of the wrought annealed TA15 alloy.