摘要
以提高魏氏体组织Ti60合金的拉伸强度与塑性为目标,研究固溶与时效处理对Ti60合金组织与性能演变的影响规律,并优化热处理参数。结果表明,初始魏氏组织晶粒较为粗大,经过固溶与时效处理后,晶粒明显减小,层片状α相明显减少。初始魏氏组织Ti60合金抗拉强度为850 MPa,伸长率为0.9%,1000℃固溶处理后,Ti60合金的抗拉强度达到1100 MPa,伸长率为3.7%。1000℃固溶+600℃8 h时效处理后,抗拉强度达到1200 MPa,伸长率为3.3%。随固溶温度提高,其硬度与抗拉强度增加,伸长率降低。随时效时间延长,硬度先增大后减小。经1050℃固溶+600℃8 h时效处理后Ti60合金具有最大硬度值509 HV。
To enhance the tensile strength and ductility of Ti60 alloy with Widmansttten microstructure,effects of solid solution and aging processes on microstructure and property were studied,and the heat treatment parameters were optimized. The results show that the large grain size of Ti60 alloy with Widmansttten microstructure is refined significantly after solid solution and aging treatments. Tensile strength and elongation of Ti60 alloy with Widmansttten microstructure are 850 MPa and 0. 9%,respectively. After solid solution at 1000 ℃,the tensile strength and ductility increase to 1100 MPa and 3. 7%. The strength further increases to 1200 MPa,while the ductility slightly decreases to 3. 3% after solid solution at 1000 ℃ and then aging at 600 ℃ for 8 h. Moreover,the tensile strength and hardness of Ti60 alloy increase while the ductility decreases with increasing solid solution temperatures and decreasing aging temperatures. In addition,the hardness firstly increases and then decreases with increasing aging time. The hardness of the alloy increases to 509 HV after solid solution at 1050 ℃ and aging at 600 ℃ for 8 h.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2015年第10期39-45,共7页
Transactions of Materials and Heat Treatment
基金
国家高技术研究发展计划项目(2013AA031202)
国家自然科学基金(51471063,51271064)
中央高校基本科研业务费专项资金(HIT.BRETIII201401)
关键词
Ti60合金
热处理
魏氏体组织
拉伸性能
Ti60 alloy
heat treatment
Widmanstätten microstructure
tensile property
