微织构对Ti-6Al-3Nb-2Zr-1Mo合金的应力腐蚀性能的影响

许亚利; 张斌斌; 卢晓阳

微织构对Ti-6Al-3Nb-2Zr-1Mo合金的应力腐蚀性能的影响

许亚利^1,2,
张斌斌^1,2,
卢晓阳^1,2

1. 中国船舶重工集团公司第七二五研究所, 河南洛阳 471023;
2. 国家新材料生产应用示范平台(先进海工与高技术船舶材料), 河南洛阳 471023

基金项目:

国家重点研发专项(2017YFC0305502)

详细信息

作者简介:
许亚利,女,1989年生,工程师,主要从事陶瓷及金属材料的研发

中图分类号: TG146.23
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- 被引次数: 0
出版历程
- 收稿日期: 2020-12-01
- 刊出日期: 2021-08-25

Effect of Microtexture on the Stress Corrosion Property of Ti-6Al-3Nb-2Zr-1Mo Alloy

1. Luoyang Ship Material Research Institute, Luoyang 471023, China;
2. National New Material Production and Application Demonstration Platform(Advanced Marine Engineering and High-tech Ship Materials), Luoyang 471023, China

摘要

摘要: 采用EBSD方法对断口以及裂纹扩展路径进行观察,研究了近α型钛合金Ti-6Al-3Nb-2Zr-1Mo组织中的微织构对应力腐蚀敏感性和裂纹扩展路径的影响规律。结果表明,微织构区域的形貌为接近平行于轧面的不规则薄片层状,长度方向沿轧向扩展,微织构区的晶粒取向为c轴趋近于与板材横向平行。当加载方向与微织构区的长度方向接近平行时,微织构区内部晶粒易于柱面滑移,降低裂纹尖端的应力集中和降低应力腐蚀敏感性;当加载方向与微织构区的长度方向接近垂直时,微织构区内部晶粒不容易发生柱面滑移和基面滑移,易于造成局部应力集中和形成微裂纹,提高板材的应力腐蚀敏感性。
- 钛合金 /
- 应力腐蚀 /
- 微织构
Abstract: The influence of microtexture on the stress corrosion cracking susceptibility and crack propagation path of a near alpha titanium alloy Ti-6 Al-3 Nb-2 Zr-1 Mo were investigated by the observation of the fracture surfaces and the crack propagating paths using EBSD method. The results showed that the morphologies of the microtexture zones were irregular thin lamellae which were nearly parallel to the rolling plane, with their longitudinal direction extending along the rolling direction, and that the grain orientation in the microtexture zones was their c-axis almost parallel to the transverse direction of the bulk plate. When the loading direction was almost parallel to the longitudinal directions of the microtexture zones, prismatic slip was easily activated in the grains of these zones, so as to decrease the stress concentration at crack tip as well as the stress corrosion cracking susceptibility. When the loading direction was almost perpendicular to the longitudinal directions of microtexture zones, prismatic slip and basal slip were hard to activate and that would lead to localized stress concentration and the formation of micro-cracks, raising the stress corrosion cracking susceptibility of the plate.
- titanium alloys /
- stress corrosion cracking /
- microtexture

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参考文献(13)

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