Initiating,growing and cracking of hydrogen blisters

作     者：REN Xuechong1, SHAN Guangbin1, CHU Wuyang1, SU Yanjing1, GAO Kewei1, QIAO Lijie1, JIANG Bo2, CHEN Gang2 & CUI Yinhui2 1. Department of Materials Physics, University of Science and Technol-ogy Beijing, Beijing 100083, China 2. Technology Center of Ma’anshan Steel & Iron Corporation, Ma’anshan 432000, China 

出 版 物：《Science Bulletin》 (科学通报(英文版))

年 卷 期：2005年第17期

页      面：148-151页

学科分类：07[理学] 070205[理学-凝聚态物理] 0702[理学-物理学] 

主　　题：hydrogen blister initiating growing cracking breaking. 

摘      要：The growing process of a hydrogen blister in a wheel steel was observed in situ with an optical microscope, and the fracture surfaces formed from broken blisters on a wheel steel and bulk metallic glass were investigated. The initiating, growing, cracking and breaking of hydrogen blis-ters are as follows. Supersaturated vacancies can increase greatly during charging and gather together into a vacancy cluster (small cavity). Hydrogen atoms become hydrogen molecules in the vacancy cluster and hydrogen molecules can stabilize the vacancy cluster. The small cavity becomes the nucleus of hydrogen blister. The blister will grow with enter-ing of vacancies and hydrogen atoms. With increasing hy-drogen pressure, plastic deformation occurs first, the hydro-gen blister near the surface extrudes, and then cracks initiate along the wall of the blister with further increasing hydrogen pressure. A cracked blister can grow further through propa-gating of cracks until it breaks.