Using Small Punch Test to Investigate the Mechanical Properties of X42 Exposed to Gaseous Hydrogen:Effect of Pressure,Pre-charge Time,Punch Velocity and Oxygen Content  

作　　者：Hu-Yue Wang Hong-Liang Ming Dong-Ceng Hou Jian-Qiu Wang Wei Ke En-Hou Han 

机构地区：[1]School of Materials Science and Engineering,Northeastern University,Shenyang,110819,China [2]CAS Key Laboratory of Nuclear Materials and Safety Assessment,Institute of Metal Research,Chinese Academy of Sciences,Shenyang,110016,China [3]Analysis and Test Center,Institute of Metal Research,Chinese Academy of Sciences,Shenyang,110016,China [4]Institute of Corrosion Science and Technology,Guangzhou,510530,China

出　　处：《Acta Metallurgica Sinica(English Letters)》2024年第11期1961-1983,共23页金属学报（英文版）

基　　金：supported by the National Key R&D Program of China(2021YFB4001601);the Youth Innovation Promotion Association CAS(2022187).

摘　　要：This study investigated the effect of pressure,pre-charge time,punch velocity and oxygen content on the mechanical properties of X42 pipeline steel in gaseous hydrogen environment by using small punch test.When exposed to nitrogen,the fracture mode of X42 pipeline steel undergoes ductile fracture,but in the presence of hydrogen,it shifts to brittle fracture.Moreover,an increase in hydrogen pressure or a decrease in punch velocity is found to enhance the hydrogen embrittlement susceptibility of X42 pipeline steel,as evidenced by the decrease of maximal load,displacement at failure onset and small punch energy.But the effect of pre-charge time on the hydrogen embrittlement susceptibility of X42 pipeline steel is not very obvious.Meanwhile,the presence of oxygen has been found to effectively inhibit hydrogen embrittlement.As the oxygen content in hydrogen increases,the hydrogen embrittlement susceptibility of X42 pipeline steel decreases.

关 键 词：X42 pipeline steel Hydrogen embrittlement Mechanical properties Scanning electron microscopy(SEM) Small punch test 

分 类 号：TG146.21[一般工业技术—材料科学与工程]