Shengquan He , Yanran Ma , Dan Zhao , Dazhao Song , Xueqiu He , Siyu Luo , Jia Wang
{"title":"Fatigue crack extension and acoustic emission response law of 316L austenitic stainless steel by hydrogen charging","authors":"Shengquan He , Yanran Ma , Dan Zhao , Dazhao Song , Xueqiu He , Siyu Luo , Jia Wang","doi":"10.1016/j.tafmec.2025.104983","DOIUrl":null,"url":null,"abstract":"<div><div>To better understand the crack propagation behavior of 316L austenitic stainless steel in hydrogen environments, fatigue tests were conducted at three different stress levels on both untreated and electrochemically hydrogen-charged samples. Acoustic emission (AE) monitoring was performed throughout the testing process. The results indicate that both the hydrogen environment and stress are primary factors in reducing the fatigue life of 316L austenitic stainless steel, with a synergistic interaction that accelerates material failure. Hydrogen charging alters the fatigue fracture mechanism of 316L stainless steel, increasing the randomness of the crack extension path due to the increasing number of secondary cracks in hydrogen-charged samples. During fatigue fracture, the energy release rate of acoustic emission signals exhibits a linear positive correlation with the fatigue crack propagation rate. Under lower stress conditions, hydrogen-charged samples exhibit a higher fatigue crack propagation rate, with hydrogen serving as the primary influencing factor. A quantitative characterization model for acoustic emission parameters, suitable for hydrogen embrittlement environment but not affected by fatigue average stress, was developed to compute the fatigue crack propagation rate. This study reveals the fatigue crack propagation behavior and damage mechanisms of hydrogen-charged 316L austenitic stainless steel.</div></div>","PeriodicalId":22879,"journal":{"name":"Theoretical and Applied Fracture Mechanics","volume":"138 ","pages":"Article 104983"},"PeriodicalIF":5.6000,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Theoretical and Applied Fracture Mechanics","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0167844225001417","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, MECHANICAL","Score":null,"Total":0}
引用次数: 0
Abstract
To better understand the crack propagation behavior of 316L austenitic stainless steel in hydrogen environments, fatigue tests were conducted at three different stress levels on both untreated and electrochemically hydrogen-charged samples. Acoustic emission (AE) monitoring was performed throughout the testing process. The results indicate that both the hydrogen environment and stress are primary factors in reducing the fatigue life of 316L austenitic stainless steel, with a synergistic interaction that accelerates material failure. Hydrogen charging alters the fatigue fracture mechanism of 316L stainless steel, increasing the randomness of the crack extension path due to the increasing number of secondary cracks in hydrogen-charged samples. During fatigue fracture, the energy release rate of acoustic emission signals exhibits a linear positive correlation with the fatigue crack propagation rate. Under lower stress conditions, hydrogen-charged samples exhibit a higher fatigue crack propagation rate, with hydrogen serving as the primary influencing factor. A quantitative characterization model for acoustic emission parameters, suitable for hydrogen embrittlement environment but not affected by fatigue average stress, was developed to compute the fatigue crack propagation rate. This study reveals the fatigue crack propagation behavior and damage mechanisms of hydrogen-charged 316L austenitic stainless steel.
期刊介绍:
Theoretical and Applied Fracture Mechanics'' aims & scopes have been re-designed to cover both the theoretical, applied, and numerical aspects associated with those cracking related phenomena taking place, at a micro-, meso-, and macroscopic level, in materials/components/structures of any kind.
The journal aims to cover the cracking/mechanical behaviour of materials/components/structures in those situations involving both time-independent and time-dependent system of external forces/moments (such as, for instance, quasi-static, impulsive, impact, blasting, creep, contact, and fatigue loading). Since, under the above circumstances, the mechanical behaviour of cracked materials/components/structures is also affected by the environmental conditions, the journal would consider also those theoretical/experimental research works investigating the effect of external variables such as, for instance, the effect of corrosive environments as well as of high/low-temperature.