Interaction of Hydrogen and Retained Austenite in Bainite/Martensite Dual-Phase High Strength Steel  

作　　者：GUJia-lin CHANGKai-di FANGHong-sheng YANGZhi-gang BAIBing-zhe 

机构地区：[1]TsinghuaUniversity,Beijing100084,China [2]ShougangResearchInstituteofTechnology,Beijing100041,China

出　　处：《Journal of Iron and Steel Research International》2004年第1期42-46,共5页

基　　金：Item Sponsored by Ministry of Science and Technology of China(G1998061513)

摘　　要：The hydrogen trapping phenomena in two bainite/martensite dual-phase high strength steels(U20Si and U20DSi)were investigated by electrochemical permeation technique.The hydrogen diffusivity was calculated from data of permeation delay time,and the diffusion coefficient in U20 Si is far less than that in U20 DSi.Moreover,the hydrogen diffusivity decreases as the volume percent of retained austenite increases.The experiment results show that there are different hydrogen trappings and different volume percents of retained austenite in U20 Si and U20 DSi.The retained austenite is precipitated as films.The trap binding energy for the retained austenite and hydrogen is calculated to be 40.4kJ·mol-1.The hydrogen trapping phenomena in two bainite/martensite dual-phase high strength steels(U20Si and U20DSi)were investigated by electrochemical permeation technique.The hydrogen diffusivity was calculated from data of permeation delay time,and the diffusion coefficient in U20 Si is far less than that in U20 DSi.Moreover,the hydrogen diffusivity decreases as the volume percent of retained austenite increases.The experiment results show that there are different hydrogen trappings and different volume percents of retained austenite in U20 Si and U20 DSi.The retained austenite is precipitated as films.The trap binding energy for the retained austenite and hydrogen is calculated to be 40.4kJ·mol-1.

关 键 词：BAINITE martensite dual-phase high strength steel electrochemical permeation technique diffusion coefficient retained austenite trap binding energy 

分 类 号：TG142.1[一般工业技术—材料科学与工程]