20CrMnTi齿轮钢的应力腐蚀行为
Stress Corrosion Behavior of 20CrMnTi Gear Steel
摘 要
采用电化学噪声法研究了20CrMnTi钢在含0.3 mol/L Cl-的硼酸缓冲溶液中的应力腐蚀行为，结合预制点蚀试样的ANSYS有限元模拟和原位拉伸试验，分析了点蚀坑周围的应力分布。结果表明：应力促进20CrMnTi钢的腐蚀，与无应力时的相比，恒应力下20CrMnTi钢的电流噪声峰的幅值和寿命均有大幅提高，低应力条件下，电流噪声峰的上升有一段较长的积累期。由于点蚀的存在，垂直于拉伸方向出现了明显的应力集中现象，且距离点蚀坑较远的区域，应力集中迅速衰减。
应力腐蚀
电化学噪声
原位拉伸试验
gear steel
stress corrosion
electrochemical noise
in situ tensile test
Abstract
Stress corrosion behavior of 20CrMnTi steel in a boronic acid buffer solution containing 0.3 mol/L Cl- was studied by electrochemical noise method. Combined with ANSYS finite element simulation and in-situ tensile test of precast pitting samples, the stress distribution around the corrosion pit was analyzed. The results show that stress promoted the corrosion of 20CrMnTi steel, and the amplitude and life of the current noise peak of 20CrMnTi steel under constant stress were greatly improved compared with those without stress. At low stress levels, the rise in current noise peak had a long accumulation period. Due to the existence of pitting, significant stress concentration occurred perpendicular to the tensile direction, and the stress concentration was rapidly attenuated in the region far from the corrosion pit.
中图分类号 TG172.9 DOI 10.11973/fsyfh-201903003
所属栏目 试验研究
基金项目 国家自然科学基金（51661006）；贵州省教育厅创新群体项目（2016021）；贵州省科技计划（20175656）
收稿日期 2017/10/15
修改稿日期
网络出版日期
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联系人作者向嵩,E-mail:sxiang@gzu.edu.cn
引用该论文: JI Xuanming,XIANG Song,YU Wen,XIANG Zijie,ZHOU Guobo,YU Mingfei. Stress Corrosion Behavior of 20CrMnTi Gear Steel[J]. Corrosion & Protection, 2019, 40(3): 169
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【12】PENGA D Q,KIMA T H,CHUNGA J H,et al. Development of nitride-layer of AISI 304 austenitic stainless steel during high-temperature ammonia gas-nitriding[J]. Applied Surface Science,2010,256(24):7522-7529.
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