双重退火Ti6246合金棒材微观组织与拉伸性能研究  

Study on Microstructure and Tensile Properties of Double Annealed Ti6246 Alloy Bar

作　　者：李国善 Li Guoshan(Gansu Iron and Steel Vocational Technical College,Jiayuguan 735100,China)

机构地区：[1]甘肃钢铁职业技术学院,甘肃嘉峪关735100

出　　处：《钛工业进展》2024年第5期23-26,共4页Titanium Industry Progress

摘　　要：对Ti6246合金棒材进行(930~990)℃/2 h/AC+580℃/4 h/AC双重退火热处理,探究不同热处理工艺对Ti6246合金棒材拉伸性能的影响。研究表明,随着第一重退火热处理温度的升高,α相逐渐减少直至消失,且β晶界逐渐清晰;抗拉强度和屈服强度逐渐增大,断面收缩率和断后伸长率逐渐降低;断裂机制亦发生改变,从韧性–韧窝断裂转变为脆性–解理断裂。经950℃/2 h/AC+580℃/4 h/AC双重退火热处理后,Ti6246合金棒材的抗拉强度为1083 MPa,屈服强度为985 MPa,断后延伸率为12%,断面收缩率为18%,强塑性匹配佳,具有较好的综合性能。The Ti6246 alloy bar was subjected to double annealing heat treatment at(930-990)℃/2 h/AC+580℃/4 h/AC.The influence of different heat treatment processes on the tensile properties of Ti6246 alloy bar was explored.The research shows that with the increase of the first-stage annealing heat treatment temperature,theαphase gradually decreases and even disappears,and theβgrain boundary gradually becomes clear.The tensile strength and yield strength gradually increase,while the reduction of area and elongation after fracture gradually decrease.The fracture mechanism also changes from ductile-dimpled fracture to brittle-cleavage fracture.After double annealing heat treatment at 950℃/2 h/AC+580℃/4 h/AC,the tensile strength of Ti6246 alloy bar is 1083 MPa,the yield strength is 985 MPa,the elongation after fracture is 12%,and the reduction of area is 18%.The strength and plasticity are well matched,and better comprehensive properties are obtained.

关 键 词：Ti6246合金 微观组织 拉伸性能 断口形貌 

分 类 号：TG166.5[金属学及工艺—热处理] TG146.23[金属学及工艺—金属学]