不同热处理制度对TA31合金组织和力学性能的影响  

Effects of Different Heat Treatment on Microstructure and Mechanical Properties of TA31 Alloy

作　　者：孙朋朋[1] 李鹏 李梁[1] 李瑞武 齐风华[1] SUN Pengpeng;LI Peng;LI Liang;LI Ruiwu;QI Fenghua(CSIS No.725 Research Insitute, Luoyang 471039, China)

机构地区：[1]中国船舶重工集团公司第七二五研究所

出　　处：《热加工工艺》2019年第14期150-152,155,共4页Hot Working Technology

摘　　要：研究了不同热处理制度(固溶时效,退火)对TA31合金微观组织和力学性能的影响。采用OM、TEM、SEM研究了其微观组织形貌,采用拉伸试验机测试了拉伸性能。结果表明:在相变点之下依次选取不同固溶温度(920、940、960、980℃)对TA31合金试样进行固溶+时效工艺处理,当固溶温度低于960℃时,时效后的强度随固溶温度升高而增大;当固溶温度大于960℃后,强度降低;αkv值随固溶温度升高而增大。试样固溶时效态的拉伸强度高于试样退火态的强度。TA31合金随着固溶温度的升高,初生α相含量减少,且组织中存在等轴初生α相+β转内细小的针状次生α相。The effect of different heat treatment(solid solution and aging, annealing) on the microstructure and mechanical properties of TA31 alloy were studied. The microstructure was observed by OM, TEM, SEM and the tensile properties were evaluated by a tensile tester. The results show that, when the four solid solution temperature(920, 940, 960,980 ℃) are selected below the phase transition point for the solution aging treatment of TA31 alloy. The tensile strength increases with the solid solution temperature increasing, the tensile strength decreases when the solid solution temperature is higher than 960 ℃. The value of αkvincreases with the increase of the solution temperature. The tensile strength of the sample in solution aging state is higher than that of the annealed sample. With the increase of solution temperature, the content of primary α phase in TA31 alloy decreases, and there are fine acicular secondary α phase in β transformation and equiaxed primary α phase +.

关 键 词：TA31钛合金 固溶+时效 退火 微观组织 力学性能 

分 类 号：TG156.9[金属学及工艺—热处理] TG146.23[金属学及工艺—金属学]