固溶时效处理对钻杆用Ti-6Al-4V-1Mo-1Zr合金组织及性能的影响
Effect of solution aging heat treatment on microstructure and properties of Ti-6Al-4V-1Mo-1Zr alloy for drill pipe
冯春 1张凯 2张芳芳 2朱丽娟 2马栋 2刘洪涛 3李双贵4
作者信息
- 1. 中国石油集团工程材料研究院有限公司油气钻采输送装备全国重点实验室 陕西西安 710077;中国石油集团渤海石油装备制造有限公司 天津 300457
- 2. 中国石油集团工程材料研究院有限公司油气钻采输送装备全国重点实验室 陕西西安 710077
- 3. 中国石油塔里木油田公司 新疆库尔勒 841000
- 4. 中国石油化工股份有限公司西北油田分公司 新疆乌鲁木齐 830011
- 折叠
摘要
采用力学性能测试、组织观察等方法研究了固溶时效热处理工艺对钻杆用Ti-6Al-4V-1Mo-1Zr合金显微组织和力学性能的影响.研究结果表明,两相区固溶时效后实验材料得到双态组织,初生a相体积分数随固溶温度升高而减少,β转变组织及次生a相尺寸和体积分数随固溶温度升高而增加;相变点以上固溶时效后实验材料得到片层组织,使断裂过程中裂纹路径发生偏转,提高了裂纹的扩展路径,增大了冲击过程中钛合金可吸收的能量,提高了钛合金的冲击韧性;两阶段固溶时效热处理后的钛合金屈服强度达932 MPa以上、伸长率为14.1％、冲击功大于45 J,具备良好的强韧性匹配.
Abstract
The impact of solution and aging heat treatment process on the microstructure and mechanical properties of Ti-6Al-4V-1 Mo-1Zr alloy for drill pipes were studied by mechanical property test and microstructure observation.The results show that after solution aging in two-phase region,the experimental materials with duplex microstructure can be obtained;the volume fraction of primary αphase is decreased with increasing solution temperature,while the size and volume fraction of the β transition structure and secondaryα phase is increased with increasing solution temperature.After solution aging above the phase transformation temperature,the ex-perimental materials with lamellar microstructure can be obtained,as result of which the crack path is deflected during the fracture process.This has improved the crack propagation path,increased the energy absorbed by titanium alloy in the impact process,and enhanced the impact toughness of titanium alloy.The titanium alloy after TSSA treatment has the yield strength over 932 MPa,the elongation of 14.1％,and the impact energy greater than 45J,demonstrating ideal strength and toughness matching properties.
关键词
石油钻杆/Ti-6Al-4V-1Mo-1Zr钛合金/固溶时效/显微组织/力学性能/冲击功Key words
oil drill pipe/Ti-6Al-4V-1 Mo-1 Zr titanium alloy/solution aging/microstructure/mechanical properties/impact energy引用本文复制引用
基金项目
国家重点研发计划(2021YFB3700803)
中国石油天然气集团有限公司科技项目(2023ZZ11)
中国石油天然气集团有限公司科技项目(2022DQ03-02)
出版年
2024
NETL
NSTL
万方数据