La和Ag对石油钻杆用Weldalite049铝锂合金热稳定性的影响  

Effects of La and Ag on Thermal Stability of Weldalite049 Al-Li Alloy Used for Oil Drilling Rod

作　　者：王复越 王向杰 徐闻慧 崔建忠 Wang Fuyue;Wang Xiangjie;Xu Wenhui;Cui Jianzhong(Key Laboratory of Electromagnetic Processing of Materials,Ministry of Education,Northeastern University,Shenyang 110819,China)

机构地区：[1]东北大学材料电磁过程研究教育部重点实验室,辽宁沈阳110819

出　　处：《稀有金属材料与工程》2020年第9期3052-3058,共7页Rare Metal Materials and Engineering

基　　金：国家重点研发计划(2016YFB0300901);国家自然科学基金(U1708251,51574075,U1608252);中央高校基本科研专项资金(N180905010)。

摘　　要：通过对添加微量La和Ag的Weldalite049铝合金挤压棒材采用T6峰时效处理,利用SEM、TEM及拉伸性能检测,研究稀土元素La和Ag的不同配比在热处理后以及不同的热暴露条件下对Weldalite049铝合金石油钻杆的显微组织和拉伸性能的影响。其目的是研究在满足力学要求的前提下,用少量稀土La替代价格较高Ag的方法。实验结果表明,含添加0.05%La以及0.2%Ag(质量分数)的Weldalite049合金经T6处理后其峰时效抗拉强度为619.2 MPa,经190℃,24 h的热暴露后,其力学性能小幅下降,抗拉强度下降了4.87%;添加0.1%La而无Ag的Weldalite049峰时效合金经175℃,60 h的热暴露后其抗拉强度为548.4 MPa,与热暴露前相比抗拉强度下降了5.98%,力学性能仍保持在一个较高的水平(σb≥530MPa、σ0.2≥480MPa、δ≥7%)。The influence of different ratios of La and Ag under the condition of T6peak aging treatment and different thermal exposure was investigated.The microstructures and tensile properties of Weldalite049 aluminum alloy were analyzed by SEM,TEM and tensile properties testing.The aim is to investigate the method of substituting a small amount of rare earth La for higher price Ag in precondition of satisfying mechanical requirements.It is proved that the tensile strength of Weldalite049 alloy with 0.05 wt%La and 0.2 wt%Ag is619.2 MPa after T6peak treatment,and the ultimate tensile strength is decreased by 4.87%under thermal exposure at 190℃/24 h.The tensile strength of Weldalite049 alloy with 0.1 wt%La but without Ag is 548.4 MPa under thermal exposure at 175℃/60 h,decreased by5.98%,while the mechanical properties remain at a high level(σb>530 MPa,σ0.2≥480 MPa,δ≥7%).

关 键 词：稀土La Weldalite049 铝锂合金 石油钻杆 热暴露 

分 类 号：TG146.21[一般工业技术—材料科学与工程]