应变速率对预充氢DP780钢氢脆敏感性的影响

doi:10.11902/1005.4537.2020.259

中国腐蚀与防护学报

2022, Vol. 42

Issue (1): 106-112 DOI: 10.11902/1005.4537.2020.259

研究报告

本期目录 | 过刊浏览

应变速率对预充氢DP780钢氢脆敏感性的影响

王贞, 刘静(

), 张施琦, 黄峰

武汉科技大学省部共建耐火材料与冶金国家重点实验室湖北省海洋工程材料及服役安全工程技术研究中心武汉 430081

Effect of Strain Rate on Hydrogen Embrittlement Susceptibility of DP780 Steel with Hydrogen Pre-charging

WANG Zhen, LIU Jing(

), ZHANG Shiqi, HUANG Feng

Hubei Engineering Technology Research Center of Marine Materials and Service Safety, The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China

全文: PDF(2561 KB) HTML

摘要:

利用电化学预充氢和慢应变速率拉伸实验研究了不同应变速率 (10^-4、10^-5和10^-6 s^-1) 条件下DP780钢的氢脆敏感性。结果表明，随应变速率降低，材料的氢脆敏感性增强，但其变化幅度与初始预充氢状态有关。当预充氢电流密度较小时，充氢量少且钢中无初始氢致裂纹，随应变速率降低，更多氢原子可扩散至试样心部应力集中处，导致断口心部脆性区域宽度增加，氢脆敏感性增强。但当预充氢电流密度较大 (≥30 mA/cm²) 且充氢量大于8.5 mg/L时，钢中产生的初始氢致裂纹会影响氢原子向心部扩散与聚集，同时其本身可捕获H原子产生氢脆，使材料氢脆敏感性随应变速率增加幅度减小。

关键词 ： DP钢, 应变速率, 预充氢, 氢脆敏感性

Abstract：

The hydrogen embrittlement susceptibility of DP780 steel under different strain rates (10^-4, 10^-5 and 10^-6 s^-1) was studied by means of slow strain rate tensile test and electrocheminal hydrogen pre-charging. The results showed that the hydrogen embrittlement susceptibility increased with decreasing strain rate, while the decreasing increment of the hydrogen embritttlement susceptibility was related to the hydrogen pre-charging parameters. When the pre-charging current density was low, pre-charged hydrogen content was low and there was no hydrogen-induced cracks in the steel. More hydrogen atoms could diffuse to the center of sample with the decreasing strain rate, which led to the increasing width of brittle region in fracture surface center portion and hydrogen embrittlement susceptibility of the steel. However, when the pre-charging hydrogen current density was over 30 mA/cm², pre-charged hydrogen content increased to 8.5 mg/L and the initial hydrogen-induced cracks generated in the steel could act as hydrogen traps, which could influence the inward diffusion and aggregation of hydrogen, therewith induce hydrogen embrittlement as a result of capturing hydrogen atom. Therefore, the hydrogen embrittlement sensitivity of the steel decreases with the increase of strain rate.

Key words： DP steel strain rate hydrogen pre-charged hydrogen embrittlement susceptibility

收稿日期: 2020-12-09

ZTFLH:

TG111.91

基金资助:国家自然科学基金(51871171)

通讯作者: 刘静 E-mail: liujing@wust.edu.cn

Corresponding author: LIU Jing E-mail: liujing@wust.edu.cn

作者简介: 王贞，女，1987年生，博士生

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引用本文:

王贞, 刘静, 张施琦, 黄峰. 应变速率对预充氢DP780钢氢脆敏感性的影响[J]. 中国腐蚀与防护学报, 2022, 42(1): 106-112.
Zhen WANG, Jing LIU, Shiqi ZHANG, Feng HUANG. Effect of Strain Rate on Hydrogen Embrittlement Susceptibility of DP780 Steel with Hydrogen Pre-charging. Journal of Chinese Society for Corrosion and protection, 2022, 42(1): 106-112.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2020.259 或 https://www.jcscp.org/CN/Y2022/V42/I1/106

图1 退火热处理工艺曲线

图2 DP780钢的显微组织

图3 不同预充氢条件下拉伸样横截面形貌

图4 不同应变速率下DP780钢的拉伸性能

图5 应变速率对预充氢DP780钢氢脆敏感指数的影响

图6 不同预充氢电流密度下试样的拉伸断口形貌 (应变速率10-4 s-1)

图7 预充氢拉伸试样在不同应变速率下断口心部脆性区域宽度

图8 DP 780钢未拉伸状态下的氢渗透曲线

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