钛合金高温短时蠕变与应力松弛的关系研究*

doi:10.11901/1005.3093.2013.981

材料研究学报

2014, Vol. 28

Issue (5): 339-345 DOI: 10.11901/1005.3093.2013.981

本期目录 | 过刊浏览

钛合金高温短时蠕变与应力松弛的关系研究*

刘坡,宗影影,郭斌,单德彬(

)

金属精密热加工国家级重点实验室哈尔滨工业大学材料科学与工程学院哈尔滨 150001

Relation between Short-term Creep and Stress Relaxation of Titanium Alloy at High Temperature

Po LIU,Yingying ZONG,Bin GUO,Debin SHAN(

)

(National Key Laboratory for Precision Hot Processing of Metals
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001)

引用本文:

刘坡,宗影影,郭斌,单德彬. 钛合金高温短时蠕变与应力松弛的关系研究*[J]. 材料研究学报, 2014, 28(5): 339-345.
Po LIU, Yingying ZONG, Bin GUO, Debin SHAN. Relation between Short-term Creep and Stress Relaxation of Titanium Alloy at High Temperature[J]. Chinese Journal of Materials Research, 2014, 28(5): 339-345.

全文: PDF(2585 KB) HTML

摘要:

蠕变或应力松弛被认为是钛合金板材热成形降低回弹的主要机理。目前对热校形阶段中的蠕变与应力松弛的区别及联系尚缺乏深入研究。本文主要进行了钛合金高温短时蠕变及应力松弛实验, 利用TEM对实验后的显微组织进行了观察。分别研究了温度、应力及时间对蠕变和应力松弛行为的影响规律, 从蠕变率-时间和蠕变-时间角度建立了蠕变与应力松弛之间的联系。研究表明: 钛合金在低温低应力下蠕变以原子扩散为主, 高温高应力下以位错滑移和攀移为主, 而应力松弛在不同温度时均以位错攀移为主要变形机制, 基于蠕变数据预测的应力松弛行为与实验结果符合较好。

关键词 ：金属材料, 钛合金, 蠕变, 应力松弛, 蠕变率

Abstract：

Creep or stress relaxation is considered as a main mechanism of reducing the springback of titanium alloy sheet during thermal forming process. So far, the difference and relation between the two phenomena have not been clearly explored. In this paper, tests of short term creep and stress relaxation of Ti6Al4V alloy were conducted at high temperature. The microstructure of the tested alloy was observed by using TEM. Effects of temperature, stress and time on creep and stress relaxation behavior were studied, respectively. The correlation and difference between the two phenomena were compared based on relations of creep strain - time and strain rate - time. Results show that creep behavior is controlled by atom diffusion at low temperature under low stress; by dislocation slide and climb at high temperature under high stress. The stress relaxation behavior is mainly governed by dislocation climb. The predicted stress relaxation behavior based on the creep data shows a good agreement with the experiment.

Key words： metallic materials titanium alloy creep stress relaxation creep rate

收稿日期: 2013-12-30

基金资助:* 国家自然科学基金面上项目51275132,材料成形与模具技术国家重点实验室开放基金资助项目2011-P11和哈尔滨市科技创新人才研究基金2008RFQXG046资助。

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https://www.cjmr.org/CN/10.11901/1005.3093.2013.981 或 https://www.cjmr.org/CN/Y2014/V28/I5/339

图1 700℃时的蠕变行为

图2 750℃时的蠕变行为

图3 各种条件下蠕变后的TEM像

图4 初始应力为45 MPa时的蠕变行为

图5 初始应力为45 MPa不同温度蠕变后的TEM像

图6 不同温度时的应力松弛曲线

图7 不同应力松弛时间后TEM像

图8 不同温度时的应力-蠕变速率关系曲线

图9 700℃由蠕变与应力松弛获得的蠕变应变与时间关系曲线

图10 经不同应力松弛时间计算的蠕变速率与时间关系

图11 不同温度下应力松弛曲线

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