热处理对锻态TC21钛合金组织及性能的影响
Effect of heat treatment on microstructure and properties of as-forged TC21 titanium alloy
何睿 1王杰 2尹慧 3翟瑞志 3向伟 3吕东莉 1尹耀吉1
作者信息
- 1. 西南石油大学新能源与材料学院,四川成都 610500
- 2. 西南石油大学新能源与材料学院,四川成都 610500;长沙理工大学材料科学与工程学院,湖南长沙 410114
- 3. 中国第二重型机械集团德阳万航模锻有限责任公司,四川德阳 618000
- 折叠
摘要
设计12种固溶+时效处理工艺,对不同固溶温度(880～920℃)与时效温度(500～650 ℃)锻态TC21钛合金的显微组织与力学性能进行研究.结果表明,随着固溶温度的升高,初生α相的含量降低、尺寸变小,钛合金的塑性也随之变差;在同一固溶温度下,时效温度变化影响次生α相的含量及尺寸,随时效温度的升高,次生α相的弥散程度增大,钛合金的屈服强度呈先增后降的趋势,当时效温度过高,达到650 ℃时,次生α相会变粗大.只进行920 ℃ ×2 h固溶处理的试样Rp0.2=1107.0 MPa,Rm=1238.5 MPa,后续时效处理的加入使屈服强度与抗拉强度大幅提升,通过920 ℃ ×2 h固溶+590 ℃ ×4 h时效处理可使锻态TC21钛合金获得优良的综合力学性能,Rp0.2=1237.7 MPa,=1322.0 MPa.
Abstract
12 kinds of solution treatment+aging processes were designed to study the microstructure and mechanical properties of as-forged TC21 titanium alloy under different solution treatment(880-920 ℃)and aging temperatures(500-650 ℃).The results show that as the solution treatment temperature rises,there is a reduction in the primary α phase's volume and dimensions,leading to decreased ductility.At the same solution temperature,the change in aging temperature affects the content and size of the secondary α phase.With the aging temperature increasing,the dispersion degree of the secondary α phase increases,and the yield strength of the titanium alloy increases first and then decreases.When the aging temperature is too high,and reaches 650 ℃ the secondary α phase becomes coarse.Specimen is subjected only to solution treat at 920 ℃ for 2 h,Which exhibites a yield strength(Rp0 2)of 1107.0 MPa and a tensile strength(Rm)of 1238.5 MPa.The addition of subsequent aging treatment significantly enhances the yield and tensile strength.Especially,by solution treatment at 920 ℃ for 2 h followed by aging at 590 ℃ for 4 h,the as-forged TC21 titanium alloy achieves excellent comprehensive mechanical properties,with a yield strength(Rp02)of 1237.7 MPa and a tensile strength(Rm)of 1322.0 MPa.
关键词
TC21钛合金/固溶时效/显微组织/力学性能Key words
TC21 titanium alloy/solution treatment and aging/microstructure/mechanical properties引用本文复制引用
基金项目
四川省自然科学基金(2022NSFSC0325)
德阳市科技计划(2021JBJZ011)
出版年
2024
NETL
NSTL
万方数据