含V低合金高强度钢中氢与位错的相互作用研究  

Study on Interaction between Hydrogen and Dislocations in V-Containing Low-Alloy High-Strength Steel

作　　者：汪犁 程晓英[1] 蔡贞祥 赵佩文 彭浩 WANG Li;CHENG Xiaoying;CAI Zhenxiang;ZHAO Peiwen;PENG Hao(Institute of Materials Science, Shanghai University, Shanghai 200072, China)

机构地区：[1]上海大学材料研究所,上海200072

出　　处：《上海金属》2022年第4期42-48,共7页Shanghai Metals

基　　金：国家自然科学基金(51871145)。

摘　　要：通过动态充氢条件下的拉伸与预充氢条件下的应力松弛试验研究,采用扫描与透射电子显微镜研究了不同温度回火的含V低合金高强度钢的微观组织。结果表明:随着动态充氢电流密度的增大,不同温度回火的钢的塑性损失增加,断口形貌从韧窝向准解理和沿晶发展;在相同电流密度下,低温回火的钢氢脆敏感性最大,且在较小电流密度下就发生脆性断裂。在应力松弛过程中,预充氢试样的松弛循环次数和有效应力增加,有效激活体积和激活能降低;在相同电流密度预充氢后,低温回火的钢有效激活体积变化较小。Microstructures of V-containing low-alloy high-strength steel tempered at different temperatures was investigated by means of tensile test under dynamic hydrogen charging condition and stress relaxation test under hydrogen pre-charging condition,and with the use of scanning and transmission electron microscopes.The results showed that with the increase in current density of dynamic hydrogen charging,the loss in plasticity of the steel tempered at different temperatures increased,and the fracture morphology developed from dimple to quasi cleavage and intergranular.At the same current density,the hydrogen embrittlement sensitivity of the steel tempered at low temperature was the highest,and brittle fracture occurred at low current density.In the process of stress relaxation,the number of relaxation cycles and effective stress increased,while the effective activation volume and activation energy decreased.At the same current density,the effective activation volume of the steel tempered at low temperature changed a little.

关 键 词：低合金高强钢 氢脆敏感性 充氢 应力松弛 激活能 

分 类 号：TG142.15[一般工业技术—材料科学与工程]