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加载方向对Al-Zn-Mg合金型材应力腐蚀开裂行为的影响

吴建山 邓运来 张臻 张议丹 孙琳

吴建山, 邓运来, 张臻, 张议丹, 孙琳. 加载方向对Al-Zn-Mg合金型材应力腐蚀开裂行为的影响[J]. 工程科学学报, 2019, 41(3): 350-358. doi: 10.13374/j.issn2095-9389.2019.03.008
引用本文: 吴建山, 邓运来, 张臻, 张议丹, 孙琳. 加载方向对Al-Zn-Mg合金型材应力腐蚀开裂行为的影响[J]. 工程科学学报, 2019, 41(3): 350-358. doi: 10.13374/j.issn2095-9389.2019.03.008
WU Jian-shan, DENG Yun-lai, ZHANG Zhen, ZHANG Yi-dan, SUN Lin. Effect of sampling direction on the stress corrosion cracking behavior of Al-Zn-Mg alloy[J]. Chinese Journal of Engineering, 2019, 41(3): 350-358. doi: 10.13374/j.issn2095-9389.2019.03.008
Citation: WU Jian-shan, DENG Yun-lai, ZHANG Zhen, ZHANG Yi-dan, SUN Lin. Effect of sampling direction on the stress corrosion cracking behavior of Al-Zn-Mg alloy[J]. Chinese Journal of Engineering, 2019, 41(3): 350-358. doi: 10.13374/j.issn2095-9389.2019.03.008

加载方向对Al-Zn-Mg合金型材应力腐蚀开裂行为的影响

doi: 10.13374/j.issn2095-9389.2019.03.008
基金项目: 

国家自然科学基金资助项目(51375503)

国家重点研发计划资助项目(2016YFB0300901)

国家重点基础研究发展计划资助项目(2012CB619500)

详细信息
  • 中图分类号: TG146.2;TG113

Effect of sampling direction on the stress corrosion cracking behavior of Al-Zn-Mg alloy

  • 摘要: 采用恒载荷拉伸应力腐蚀试验和电化学试验研究取向对Al-Zn-Mg合金型材的应力腐蚀(SCC)开裂的影响,腐蚀介质采用质量分数3.5%的NaCl溶液,容器温度维持在50±2℃,并通过光学金相显微镜(OM)、扫描电子显微镜(SEM)、电子背散射衍射(EBSD)等研究不同取向试样应力腐蚀前、后的微观形貌.结果表明横向试样在315 h时断裂,而纵向试样在整个加载过程中未发生断裂,纵向试样有更好的抗应力腐蚀开裂性能;纵截面(L-S面)的腐蚀电流密度为0.980 mA·cm-2,约为横截面(T-S面)的5倍,腐蚀倾向于沿挤压方向发展;相比T-S面,L-S面晶粒间取向差较大,大角度晶界多,容易被腐蚀产生裂纹;在应力腐蚀加载过程中,试样先发生阳极溶解,形成腐蚀坑,聚集的腐蚀产物所产生的楔入力和恒定载荷的共同作用促使裂纹在腐蚀介质中加速扩展,两种取向试样均发生了明显的晶间腐蚀,存在应力腐蚀开裂的倾向.
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出版历程
  • 收稿日期:  2018-08-19

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