预应变对DP600钢氢脆敏感性的影响

doi:10.11902/1005.4537.2017.164

中国腐蚀与防护学报

2018, Vol. 38

Issue (5): 424-430 DOI: 10.11902/1005.4537.2017.164

研究报告

本期目录 | 过刊浏览

预应变对DP600钢氢脆敏感性的影响

柯书忠, 刘静(

), 黄峰, 王贞, 毕云杰

武汉科技大学省部共建耐火材料与冶金国家重点实验室武汉 430081

Effect of Pre-strain on Hydrogen Embrittlement Susceptibility of DP600 Steel

Shuzhong KE, Jing LIU(

), Feng HUANG, Zhen WANG, Yunjie BI

State key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China

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摘要:

利用慢应变速率拉伸实验 (SSRT) 及双电解池渗氢实验,结合断口形貌观察和分析,探索了预应变对DP600钢氢脆敏感性的影响规律及机理。结果表明：在本实验预应变量范围内,预应变量小于15%时,随着预应变量的增大,DP600钢试样的氢脆敏感性不断增大,当预应变量达到15%以后,其氢脆敏感性基本趋于稳定。预应变增大了钢中的位错密度,使氢的有效扩散系数降低,有效捕获的氢量增加,从而使钢试样的氢脆敏感性增大;但当预应变量进一步增加至15%以上时,位错的相互缠结减缓氢的扩散和聚集速度,从而使试样的氢脆敏感性增加趋于平缓。

关键词 ： DP600钢, 预应变, 慢应变速率拉伸实验, 渗氢技术, 氢脆敏感性, 氢扩散

Abstract：

The effect of pre-strain on the hydrogen embrittlement (HE) susceptibility of DP600 steel was studied by means of slow strain-rate tensile (SSRT) test, electrochemical permeation technique and fractograph observation of fracture surface. The results indicate that the HE susceptibility of DP600 steel increases with the increasing pre-strain when the level of pre-strain is below 15%, and then tends to stable when the pre-strain exceeds 15%. The pre-strain increases dislocation density and the amount of effective hydrogen in the steel, but decreases the effective diffusivity (D_eff) of hydrogen, so that the HE susceptibility increases. However, when the pre-strain increases to above 15%, the HE susceptibility gradually becomes stable due to the decrease of diffusion and aggregation of hydrogen, which resulted from the dislocation tangle.

Key words： DP600 steel pre-strain SSRT electrochemical permeation technique HE susceptibility diffusion of hydrogen

收稿日期: 2017-10-11

ZTFLH:

TG171

基金资助:国家自然科学基金 (51571154)

作者简介:

作者简介柯书忠,男,1992年生,硕士生

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引用本文:

柯书忠, 刘静, 黄峰, 王贞, 毕云杰. 预应变对DP600钢氢脆敏感性的影响[J]. 中国腐蚀与防护学报, 2018, 38(5): 424-430.
Shuzhong KE, Jing LIU, Feng HUANG, Zhen WANG, Yunjie BI. Effect of Pre-strain on Hydrogen Embrittlement Susceptibility of DP600 Steel. Journal of Chinese Society for Corrosion and protection, 2018, 38(5): 424-430.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2017.164 或 https://www.jcscp.org/CN/Y2018/V38/I5/424

图1 拉伸样示意图

图2 试样在空气介质中拉伸的应力-应变曲线

图3 渗氢实验拉伸样尺寸示意图

图4 不同预应变下试样在空气和硫酸溶液中拉伸的应力-应变曲线

图5 不同预应变量下试样在空气 (HF) 和硫酸 (HC) 溶液中的延伸率、断面收缩率、氢脆指数与抗拉强度的变化曲线

图6 不同预应变试样的氢渗透曲线

表1 不同预应变量下氢的扩散动力学参数

图7 不同预应变下DP600钢的显微组织形貌及位错组态

图8 不同预应变下空拉试样的断口形貌

图9 硫酸介质中DP600钢拉伸试样的断口形貌

图10 不同预应变下硫酸介质中拉伸试样内部位错与氢原子分布示意图

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