固溶时效对Ti-5Al-3V-1Mo-1Zr钛合金钻杆组织演变及力学性能的影响  

Effect of solution aging on microstructure evolution and mechanical properties of Ti-5Al-3V-1Mo-1Zr titanium drill pipe

作　　者：冯春 宋文文 张凯 刘洪涛[2] 赵密锋[2] 朱丽娟 刘会群[3] 刘乐 FENG Chun;SONG Wen-wen;ZHANG Kai;LIU Hong-tao;ZHAO Mi-feng;ZHU Li-juan;LIU Hui-qun;LIU Le(State Key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials,Tubular Goods Research Institute of CNPC,Xi’an 710077,China;Petrochina Tarim Oilfield Company,Korla 841000,China;School of Materials Science and Engineering,Central South University,Changsha 410083,China)

机构地区：[1]中国石油集团工程材料研究院有限公司石油管材及装备材料服役行为与结构安全国家重点实验室,西安710077 [2]中国石油天然气股份有限公司塔里木油田分公司,库尔勒841000 [3]中南大学材料科学与工程学院,长沙410083

出　　处：《中国有色金属学报》2023年第6期1795-1803,共9页The Chinese Journal of Nonferrous Metals

基　　金：国家重点研发计划资助项目(2021YFB3700800);中国石油集团勘探与生产分公司重点盆地技术支持项目(201021092330)。

摘　　要：利用激光共聚焦显微镜(CLSM)、电子扫描显微镜(SEM)、透射电子显微镜(TEM)和力学性能测试等手段分析相变点上两阶段固溶时效(TSSA)对Ti-5Al-3V-1Mo-1Zr钛合金钻杆片层组织演变规律及力学性能的影响。结果表明:通过采用相变点上TSSA工艺获得了全片层转变组织,随时效温度的升高,全片层转变组织的晶界α相平均宽度由5.5μm增至9.0μm,集束内的α片层平均宽度由2.75μm增至3.95μm,材料抗拉和屈服强度变化幅度均小于0.15 MPa/℃;与原始挤压态相比,钛合金的冲击功增加74.07%,材料冲击功与α片宽度满足Hall-Petch关系;经(1000℃, 1 h,炉冷(FC))→(600℃, 1 h,空冷(AC))+(550℃, 6 h,AC)热处理后钛合金具有良好的综合性能匹配,其屈服强度为894 MPa,夏比V型缺口冲击功(-20℃)为46 J,伸长率为7.5%。The effect of two steps solution and aging treatment(TSSA)on lamellar microstructure evolution and mechanical properties of Ti-5Al-3V-1Mo-1Zr titanium alloy drill pipe was analyzed by CLSM,SEM,TEM and mechanical properties test.The results show that the whole lamellar transition microstructure is obtained by TSSA process above the phase transition point.With the increase of aging temperature,the average width ofαphase at grain boundary increases from 5.5μm to 9.0μm,and the average width ofαlamellar increases from 2.75μm to 3.95μm,but changes of the tensile and yield strength can be less than 0.15 MPa/℃.Compared with the original extrusion state,the impact energy of titanium alloy can be increased significantly by 74.07%,and the Hall−Petch relationship between the material impact energy andαsheet width is satisfied.After heat treatment at(1000℃,1 h,FC)→(600℃,1 h,AC)+(550℃,6 h,AC),the titanium alloy has good comprehensive property matching.The yield strength is 894 MPa,the Charpy V-notch impact work(−20℃)is 46 J,and the elongation is 7.5%.

关 键 词：Ti-5Al-3V-1Mo-1Zr 钛合金钻杆 相变点 固溶时效 片层组织 力学性能 

分 类 号：TG146.23[一般工业技术—材料科学与工程]