温度对Al-Zn-Mg-Cu合金应力腐蚀敏感性的影响

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英文篇名：Influence of Temperature on Stress Corrosion Susceptibility of Al-Zn-Mg-Cu Alloy 作者：丰亮东 ; 易丹青 ; 刘会群 ; 王斌 ; 王海生 英文作者：FENG Liangdong;YI Danqing;LIU Huiqun;WANG Bin;WANG Haisheng;Light Alloy Research Institute, Central South University;School of Material Science and Engineering, Central South University; 关键词：Al-Zn-Mg-Cu合金 ; 应力腐蚀敏感性 ; 温度 英文关键词：Al-Zn-Mg-Cu alloy;;stress corrosion susceptibility;;temperature 中文刊名：SJGY 英文刊名：Hot Working Technology 机构：中南大学轻合金研究院;中南大学材料科学与工程学院; 出版日期：2019-03-05 10:24 出版单位：热加工工艺 年：2019 期：v.48;No.506 语种：中文; 页：SJGY201904019 页数：4 CN：04 ISSN：61-1133/TG 分类号：86-88+93

摘要

采用慢应变拉伸的方法研究了服役温度对石油钻杆用Al-Zn-Mg-Cu合金应力腐蚀敏感性的影响。研究表明:T6态Al-Zn-Mg-Cu合金的应力腐蚀敏感性随温度升高而升高;在20℃下的应力腐蚀敏感性要远低于40、60、80℃下的应力腐蚀敏感性;40、60、80℃下合金应力腐蚀敏感性上升幅度较小。20℃常温下应力腐蚀开裂主导机制是阳极溶解;40℃及较高温度下应力腐蚀开裂的主导机制是氢脆机制,此时阳极溶解起到辅助作用。较高的温度不仅加快了氢原子的扩散速度,而且也促进了晶界及位错的运动,使得氢脆机制起主导作用。
        The influence of temperature on stress corrosion susceptibility of Al-Zn-Mg-Cu alloy used for oil drill pipes was studied by slow strain rate test. The results show that the stress corrosion susceptibility of Al-Zn-Mg-Cu alloy in T6 temper stare increases with temperature increasing. The stress corrosion susceptibility at room temperature of 20℃ is much lower than that of 40 ℃, 60 ℃ and 80℃. At 40 ℃, 60 ℃ and 80 ℃, the stress corrosion susceptibility of the alloy increases a little. The dominant mechanism of stress corrosion cracking is anodic dissolution at 20 ℃, while the hydrogen embrittlement mechanism dominates at 40 ℃ and higher temperatures, in which the anodic dissolution plays an auxiliary role. The higher temperature does not only accelerate the diffusion rate of hydrogen atom, but also promotes the movement of grain boundary and dislocation, making hydrogen embrittlement mechanism play a leading role.

引文

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