摘要
研究了常规固溶+时效、双时效及固溶+预时效+时效处理对热加工态TB2钛合金显微组织及力学性能的影响。显微组织研究表明:通过增加低温预时效工艺,可以使经热处理后的TB2钛合金中析出的次生α相较经常规固溶+时效处理后的更加均匀、细小。力学性能分析表明:经常规固溶+时效处理后,TB2钛合金的塑性较好,但强度偏低;双时效处理可以提高TB2钛合金的强度,但塑性较差;固溶+预时效+时效处理后,TB2钛合金的强度与塑性匹配良好。进一步热处理工艺研究表明:经780℃×1 h/AC+350℃×6 h/AC+560℃×8 h/AC热处理后,TB2钛合金的强度与塑性达到最优匹配,抗拉强度为1 190 MPa,延伸率为14%。
The influence of heat treatments on microstructure and mechanical properties of TB2 titanium alloy in hot working state which included solution ＋ aging, double aging and solution ＋ pre-aging ＋ aging were compared in this research. The microstructure studies show that, adding pre-aging process at low temperature during conventional solution ＋ aging treatment can result in more homogeneous and fine secondary α phase. The mechanical analysis reveals that TB2 titanium alloy has good plasticity but low strength by conventional solution ＋ aging treatment, while higher strength and poorer plasticity have been found by double aging treatment. However, solution ＋ pre-aging ＋ aging treatment can significantly improve the strength of TB2 titanium alloy, while the plasticity maintained. Further researches indicate that there is an optimal match between strength and plasticity by heat treatment of 780 ℃ × 1 h/AC ＋350 ℃ ×6 h/AC ＋560 ℃ ×8 h/AC, for which the strength can up to 1 190 MPa, and the elongation to 14%.
出处
《钛工业进展》
CAS
北大核心
2015年第6期31-35,共5页
Titanium Industry Progress
关键词
TB2钛合金
热处理
预时效
显微组织
力学性能
TB2 titanium alloy
heat treatment
pre-aging
microstructure
mechanical properties
