回火温度对含V、Nb高强度低合金钢氢脆敏感性的影响  

Effect of tempering temperature on hydrogen embrittlement sensitivity of a high strength low alloy steel containing V and Nb

作　　者：王兆丰 程晓英[1] 李晓亮 彭浩 蔡贞祥 Wang Zhaofeng;Cheng Xiaoying;Li Xiaoliang;Peng Hao;Cai Zhenxiang(Institute of Materials,Shanghai University,Shanghai 200072,China)

机构地区：[1]上海大学材料研究所,上海200072

出　　处：《金属热处理》2023年第3期12-18,共7页Heat Treatment of Metals

基　　金：国家自然科学基金(51871145)。

摘　　要：采用氢渗透试验和动态充氢拉伸试验研究了920℃冰水淬火后回火温度(560、600和640℃)对某含0.15%V和0.05%Nb(质量分数)高强度低合金钢的氢扩散系数和氢脆敏感性的影响,并利用金相显微镜、X射线衍射仪、透射电镜(TEM)观察分析回火试样的微观组织。结果表明,随回火温度升高,氢扩散系数增加,氢扩散激活能降低,同时钢的氢脆敏感性也降低,这是因为随回火温度升高,钢中作为氢陷阱的位错密度减少,从而使得氢陷阱密度减小,在相同的充氢条件下可扩散氢含量减小。Effect of tempering temperature(560,600 and 640℃)after 920℃ice-water quenching on hydrogen diffusion and hydrogen embrittlement sensitivity of a high strength low alloy steel with 0.15%V and 0.05%Nb(mass fraction)was investigated by hydrogen penetration and dynamic hydrogen charging tensile test,and the microstructure of the tempered specimens was observed and analyzed by metallographic microscope,X-ray diffractometer and transmission electron microscope.The results show that with the increase of tempering temperature,the hydrogen diffusion coefficient increases,the hydrogen diffusion activation energy and hydrogen embrittlement sensibility decrease,which is because that with the increase of tempering temperature,the decrease of dislocation density reduces the density of hydrogen traps,and the diffusible hydrogen content decreases under the same hydrogen charging condition.

关 键 词：高强度低合金钢 氢扩散 回火温度 氢脆敏感性 

分 类 号：TG142.1[一般工业技术—材料科学与工程] TG174.4[金属学及工艺—金属材料]