Ti-6Al-4V合金的室温蠕变行为  

Room Temperature Creep Behavior of Ti-6Al-4V Alloy

作　　者：席国强 邱建科[1,2,3] 雷家峰 马英杰[1,2,3] 杨锐 XI Guoqiang;QIU Jianke;LEI Jiafeng;MAYingjie;YANG Rui(Shi-Changxu Innovation Center for Advanced Materials,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;School of Materials Science and Engineering,University of Science and Technology of China,Shenyang 110016,China;Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai),Zhuhai 519000,China)

机构地区：[1]中国科学院金属研究所师昌绪先进材料创新中心,沈阳110016 [2]中国科学技术大学材料科学与工程学院,沈阳110016 [3]南方海洋科学与工程广东省实验室(珠海),珠海519000

出　　处：《材料研究学报》2021年第12期881-892,共12页Chinese Journal of Materials Research

基　　金：国家自然科学基金(51701219,91960202);国家重点研发计划(2016YFC0300600,2016YFC0304200,2017YFC0305501);南方海洋科学与工程广东省实验室(珠海)创新团队建设项目(311021013)。

摘　　要：研究了Ti-6Al-4V钛合金板材的室温蠕变行为及其对合金后续使用性能的影响。结果表明:合金的宏观织构、应力水平以及预塑性应变都显著影响其室温蠕变行为。在加载方向上合金的<0001>峰值极密度越高,则其加工硬化指数越大、蠕变指数越小、室温蠕变性能越好。足够大的应力,是合金发生室温蠕变的必要条件。只有在蠕变应力不小于0.85σy的条件下才能观察到较为明显的室温蠕变,且室温蠕变效应随着蠕变应力水平的增大而增大。在室温下无论是蠕变还是单调加载引起的塑性应变,都抑制合金的后续蠕变行为。预加的塑性应变虽然抑制合金的后续蠕变应变,却使合金的后续疲劳性能恶化。The room temperature creep behavior of Ti-6Al-4V alloy and its effect on subsequent mechanical properties were investigated. The results show that all these factors, such as macro-texture,creep stress level and pre-plastic-strain, have a significant impact on the room temperature creep behavior of Ti-6Al-4V. With the increase of the <0001> peak pole density along the loading direction, the work hardening exponent increases, and the creep exponent becomes smaller, resulting in the better room temperature creep property of Ti-6Al-4V. Enough high stress is the prerequisite for room temperature creep. The obvious room temperature creep behavior can be observed only when the creep stress is not lower than 0.85σy, and the room temperature strain increases with the creep stress level. Pre-plasticstrain can suppress the subsequent room temperature creep of Ti-6Al-4V, no matter the pre-plastic-strain comes from the monotonic loading or from the creep behavior. The pre-plastic-strain can deteriorate the fatigue property of the alloy, although it can reduce subsequent creep strain.

关 键 词：金属材料 钛合金 TI-6AL-4V 室温蠕变 宏观织构 预塑性应变 力学性能 

分 类 号：TG146.23[一般工业技术—材料科学与工程]