回火温度对含Nb低合金高强度钢氢行为的影响  

Effect of tempering temperature on hydrogen behavior of Nb-containing HSLA steel

作　　者：蔡贞祥 程晓英[1] 彭浩 李晓亮 王兆丰 Cai Zhenxiang;Cheng Xiaoying;Peng Hao;Li Xiaoliang;Wang Zhaofeng(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4期45-52,共8页Heat Treatment of Metals

基　　金：国家自然科学基金(51871145)。

摘　　要：采用X射线衍射、电化学氢渗透和动态充氢拉伸试验研究了含Nb低合金高强度钢560、600和640℃回火的氢行为,建立了氢扩散系数、氢浓度、氢扩散激活能与氢陷阱密度之间的定量关系。结果表明,随着回火温度的升高,试验钢的位错密度降低,氢陷阱密度降低,氢扩散系数增大,氢扩散激活能和氢浓度降低,氢脆敏感性下降。Hydrogen behavior of Nb-containing HSLA steel tempered at 560,600 and 640℃was investigated by means of X-ray diffraction,electrochemical hydrogen permeation and dynamic hydrogen charging tensile tests,respectively.The quantitative relations of hydrogen diffusion coefficient,hydrogen concentration,as well as activation energy for hydrogen diffusion with hydrogen trap sites density were established.The results show that with the increase of tempering temperature,the dislocation density of the tested steel decreases,hence the hydrogen trap sites density decreases.In the meantime,the hydrogen diffusion coefficient increases,while the activation energy of hydrogen diffusion and hydrogen concentration decreases,which reduces the susceptibility of hydrogen embrittlement.

关 键 词：NB微合金化 X射线衍射 氢渗透 氢脆敏感性 

分 类 号：TG142.41[一般工业技术—材料科学与工程] TG172[金属学及工艺—金属材料]