不同充氢条件下AH36钢的氢脱附及氢脆敏感性

doi:10.13251/j.issn.0254-6051.2025.07.021

金属热处理 ›› 2025, Vol. 50 ›› Issue (7): 151-158.DOI: 10.13251/j.issn.0254-6051.2025.07.021

不同充氢条件下AH36钢的氢脱附及氢脆敏感性

陈翠, 李维娟, 张大征, 庞启航, 潘越, 马祉怡, 许廷峰

辽宁科技大学材料与冶金学院, 辽宁鞍山 114051

收稿日期:2025-02-10 修回日期:2025-05-13 出版日期:2025-07-25 发布日期:2025-07-28
通讯作者: 李维娟,教授,博士,E-mail:liweijuan826@163.com
作者简介:陈翠(1999—),女,硕士研究生,主要研究方向为高性能金属材料,E-mail:2013463507@qq.com。
基金资助:
国家自然科学基金(52074152,52204346)

Hydrogen desorption and hydrogen embrittlement susceptibility of AH36 steel under different hydrogen charging conditions

Chen Cui, Li Weijuan, Zhang Dazheng, Pang Qihang, Pan Yue, Ma Zhiyi, Xu Tingfeng

School of Materials and Metallurgy, University of Science and Technology Liaoning, Anshan Liaoning 114051, China

Received:2025-02-10 Revised:2025-05-13 Online:2025-07-25 Published:2025-07-28

摘要/Abstract

摘要： 通过氢微印技术、热脱附谱分析、慢应变速率拉伸试验,结合扫描电镜和透射电镜,探究了充氢条件为50 mA/cm²-24 h、100 mA/cm²-2 h、100 mA/cm²-24 h时AH36钢板中的氢脱附行为及氢脆敏感性。结果表明,充氢后,氢原子主要存在于珠光体中渗碳体/铁素体相界和铁素体晶界处,晶内分布较少,珠光体中渗碳体/铁素体相界、铁素体晶界和晶内的位错显著增多,并且铁素体晶界宽化;在200 ℃以下出现一个氢的热脱附峰,其最大脱附速率为0.012~0.063 μg/(g·min),脱附累积总量为0.48~4.47 μg/g。随着充氢电流密度和充氢时间的增加,氢原子的最大脱附速率和脱附总量逐渐减小;屈服平台长度逐渐缩短,屈服强度变化不超过1.16%,抗拉强度由483.9 MPa降至438.1 MPa、断后伸长率由55.8%降至19.4%,氢脆敏感性显著增加;拉伸断口缩颈现象逐渐消失,形貌均由韧窝向河流状花样转变,断裂机制由韧性断裂逐渐转变成脆性断裂。

关键词: AH36钢, 电化学充氢, 氢微印技术, 热脱附分析, 氢脆敏感性

Abstract: Hydrogen desorption behavior and hydrogen embrittlement susceptibility of AH36 steel plate under hydrogen charging conditions of 50 mA/cm²-24 h, 100 mA/cm²-2 h, and 100 mA/cm²-24 h were explored by hydrogen microprint technique, thermal desorption spectrum analysis, slow strain rate tensile experiment, and scanning electron microscopy and transmission electron microscopy. The results show that after hydrogen charging, the hydrogen atoms mainly exist at the cementite/ferrite phase boundary and ferrite grain boundary in the pearlite, and the intragranular distribution is less. The dislocations at the cementite/ferrite phase boundaries, ferrite grain boundaries and intragranular dislocations in the pearlite increase significantly, and the ferrite grain boundaries are broadened. A thermal desorption peak of hydrogen appears below 200 ℃, and its maximum desorption rate is 0.012-0.063 μg/(g·min), and the cumulative total desorption is 0.48-4.47 μg/g. With the increase of hydrogen charging current density and hydrogen charging time, the maximum desorption rate and total desorption amount of hydrogen atoms gradually decrease. The length of the yield platform gradually decreases, the yield strength changes by no more than 1.16%, the tensile strength decreases from 483.9 MPa to 438.1 MPa, the elongation after fracture decreases from 55.8% to 19.4%, and the hydrogen embrittlement susceptibility increases significantly. The necking phenomenon of tensile fractures gradually disappears, the morphologies change from dimples to river-like patterns, and the fracture mechanism gradually changes from ductile to brittle.

Key words: AH36 steel, electrochemical hydrogen charging, hydrogen microprint technique, thermal desorption spectrum analysis, hydrogen embrittlement susceptibility

中图分类号:

TG142.1

陈翠, 李维娟, 张大征, 庞启航, 潘越, 马祉怡, 许廷峰. 不同充氢条件下AH36钢的氢脱附及氢脆敏感性[J]. 金属热处理, 2025, 50(7): 151-158.

Chen Cui, Li Weijuan, Zhang Dazheng, Pang Qihang, Pan Yue, Ma Zhiyi, Xu Tingfeng. Hydrogen desorption and hydrogen embrittlement susceptibility of AH36 steel under different hydrogen charging conditions[J]. Heat Treatment of Metals, 2025, 50(7): 151-158.

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不同充氢条件下AH36钢的氢脱附及氢脆敏感性

Hydrogen desorption and hydrogen embrittlement susceptibility of AH36 steel under different hydrogen charging conditions

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