<strong>Ti-6Al-4V</strong>合金的室温蠕变行为

doi:10.11901/1005.3093.2021.151

材料研究学报

2021, Vol. 35

Issue (12): 881-892 DOI: 10.11901/1005.3093.2021.151

研究论文

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Ti-6Al-4V合金的室温蠕变行为

席国强¹^,², 邱建科¹^,²^,³(

), 雷家峰¹^,²^,³(

), 马英杰¹^,²^,³, 杨锐¹^,²^,³

^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

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

XI Guoqiang¹^,², QIU Jianke¹^,²^,³(

), LEI Jiafeng¹^,²^,³(

), MA Yingjie¹^,²^,³, YANG Rui¹^,²^,³

^1.Shi -Changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
^2.School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China
^3.Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519000, China

引用本文:

席国强, 邱建科, 雷家峰, 马英杰, 杨锐. Ti-6Al-4V合金的室温蠕变行为[J]. 材料研究学报, 2021, 35(12): 881-892.
Guoqiang XI, Jianke QIU, Jiafeng LEI, Yingjie MA, Rui YANG. Room Temperature Creep Behavior of Ti-6Al-4V Alloy[J]. Chinese Journal of Materials Research, 2021, 35(12): 881-892.

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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0.85σ_y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。

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

Abstract：

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 0.85σ_y, and the room temperature strain increases with the creep stress level. Pre-plastic-strain 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.

Key words： metallic materials titanium alloy Ti-6Al-4V room temperature creep macrotexture pre-plastic-strain mechanical properties

收稿日期: 2021-02-26

ZTFLH:

TG146.2+3

基金资助:国家自然科学基金(51701219);国家重点研发计划(2016YFC0300600);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)

作者简介: 席国强，男，1992年生，博士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2021.151 或 https://www.cjmr.org/CN/Y2021/V35/I12/881

图1 试样的规格和取样示意图

表1 Ti-6Al-4V轧制板材各向各层单调压缩性能(平行样数量为2)

图2 普通蠕变和保载疲劳的加载波形

图3 Ti-6Al-4V轧制板材从表层到心部的显微组织

图4 Ti-6Al-4V轧制板材从表层到心部的(0001)极图

图5 Ti-6Al-4V轧制板材各向各层的室温单调压缩应力应变曲线

图6 Ti-6Al-4V轧制板材各向各层的室温压缩蠕变应变-时间曲线以及蠕变速率-时间曲线

表2 Ti-6Al-4V各向各层室温压缩蠕变参数的拟合结果(平行样数量为2)

图7 加工硬化指数n和蠕变指数b与<0001>峰值极密度之间的关系

图8 Ti-6Al-4V轧制板材在普通压缩蠕变和压缩保载疲劳中塑性应变的累积

表3 Ti-6Al-4V轧制板材室温压缩保载疲劳中蠕变参数的拟合结果(平行样数量为2)

图9 阶梯升力蠕变实验的设计以及Ti-6Al-4V轧制板材阶梯升力蠕变实验中各应力水平下蠕变应变随时间的变化

图10 预塑性应变对Ti-6Al-4V轧制板材室温蠕变性能的影响

图11 典型的“蠕变+疲劳”和“单调拉伸+疲劳”的应力应变曲线

表4 预塑性应变对Ti-6Al-4V轧制板材疲劳性能的影响

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