Modified Slow-Strain-Rate Tensile Testing Method for Evaluation of Room-temperature Hydrogen Embrittlement Susceptibility and Its Application to 23Cr2Ni4MoV Steel  

作　　者：Sanshu Lv Xuedong Chen Zhichao Fan Yu Zhou Hao Yang Qiang Zhang Mingjian Chi Yue Li 

机构地区：[1]College of Mechanical and Electrical Engineering,Beijing University of Chemical Technology,Beijing 100029,China [2]Hefei General Machinery Research Institute Co.,Ltd.,Hefei 230031,China

出　　处：《Chinese Journal of Mechanical Engineering》2024年第6期571-578,共8页中国机械工程学报(英文版)

基　　金：Supported by National Key Research and Development Program of China (Grant No. 2023YFB3408300);the Doctoral Science and Technology Foundation of Hefei General Machinery Research Institute Co.Ltd.(Grant No. 2023010792)。

摘　　要：To evaluate the room-temperature hydrogen embrittlement susceptibility(HES) of high-pressure hydrogen storage vessels, a modified slow-strain-rate tensile(MSSRT) testing method was proposed for effectively aligning with their actual operating conditions. The effectiveness of the MSSRT testing method in evaluating the room-temperature HES of steels under high pressure was validated by comparing the results obtained using the conventional slow strain rate tensile(SSRT) and proposed MSSRT testing methods for 30CrMo steel, which is widely used for manufacturing high-pressure hydrogen storage vessels. The tensile properties and fracture morphologies of 23Cr2Ni4MoV steel were then examined using the MSSRT testing method under 35 MPa hydrogen and nitrogen at room temperature. Results indicate that 35 MPa hydrogen exerted a marginal effect on the tensile properties of 23Cr2Ni4MoV steel at room temperature when considering the MSSRT testing method;moreover, the test specimen basically exhibited macroscopic ductile fracture. Furthermore, obvious surface cracking was observed on the fractured specimen tested under hydrogen, whereas surface cracking was not observed on the fractured specimen tested under nitrogen. Hence, the relative reduction of area and surface cracking are necessary criteria for evaluating the room-temperature HES of steels using the MSSRT testing method. Overall, 23Cr2Ni4MoV steel might be unsuitable for manufacturing high-pressure hydrogen storage vessels.

关 键 词：Hydrogen embrittlement susceptibility High-pressure hydrogen storage vessel Low-alloy high-strength steel Slow-strain-rate tensile testing Fracture analysis 

分 类 号：TG1[金属学及工艺—金属学]