热处理制度对激光增材制造TA15钛合金力学性能的影响

Influence of Heat Treatment on Mechanical Properties of TA15 Titanium Alloy Fabricated by Laser Additive Manufacturing

进行了普通退火态和双重退火态激光增材制造TA15钛合金显微组织观察和力学性能试验。试验结果表明:普通退火态为细片层α+β超细网篮组织,双重退火态为端部带根须状形貌的初生α相+超细β转变组织构成的特种双态组织;普通退火态激光增材制造TA15钛合金极限强度、屈服强度和疲劳极限均优于双重退火态;双重退火态激光增材制造TA15钛合金具有较好的塑性和优异的断裂韧性。

This paper focused on studying the microstructure and mechanical properties of TA15 titanium alloy fabricated by laser additive manufacturing after normal annealing treatment and double anealing treatment.The results indicate that TA15 alloy has a super fine basketweave microstructure after normal annealing treatment,and which will change to a bi-modal microstructure with a crab-like primaryαphase with super fine transformedβphase after double annealing treatment.The ultimate strength,yield strength and fatigue limit of the alloy after normal annealing heat treatment are better than the alloy’s after double annealing treatment.But the plasticity and fracture toughness of the alloy after double annealing treatment are superior to those of the alloy after normal annealing heat treatment。