{"title":"Crack Propagation Behavior in Rotational Bending Fatigue Test of Nitrocarburized JIS SCM420 Steel","authors":"Naoya Ihara, Takashi Iwamoto, K. Nishimura","doi":"10.2355/tetsutohagane.tetsu-2022-034","DOIUrl":null,"url":null,"abstract":": The crack propagation behavior of nitrocarburized JIS SCM420 steel was investigated in a rotating bending fatigue test, focusing on crack stagnation behavior. The crack had clearly stagnated at a length of approximately 200 µm at the fatigue limit of 400 MPa, indicating that crack stagnation could control fatigue strength. The crack stagnation cannot be explained only by the change of the stress intensity factor, since the calculated value in this process increases with the depth from the notch. A large amount of plas-tic strain was observed around the tip of the crack by EBSD analysis. Because the stagnated position cor-responds to the critical depth between the hardened and unhardened regions formed by nitrocarburizing, it can be easily deformed. Therefore, it is inferred that the crack stagnation nitrocarburized JIS SCM420 steel can be explained by a plastic-induced closure mechanism.","PeriodicalId":22340,"journal":{"name":"Tetsu To Hagane-journal of The Iron and Steel Institute of Japan","volume":null,"pages":null},"PeriodicalIF":0.3000,"publicationDate":"2023-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Tetsu To Hagane-journal of The Iron and Steel Institute of Japan","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.2355/tetsutohagane.tetsu-2022-034","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"METALLURGY & METALLURGICAL ENGINEERING","Score":null,"Total":0}
引用次数: 0
Abstract
: The crack propagation behavior of nitrocarburized JIS SCM420 steel was investigated in a rotating bending fatigue test, focusing on crack stagnation behavior. The crack had clearly stagnated at a length of approximately 200 µm at the fatigue limit of 400 MPa, indicating that crack stagnation could control fatigue strength. The crack stagnation cannot be explained only by the change of the stress intensity factor, since the calculated value in this process increases with the depth from the notch. A large amount of plas-tic strain was observed around the tip of the crack by EBSD analysis. Because the stagnated position cor-responds to the critical depth between the hardened and unhardened regions formed by nitrocarburizing, it can be easily deformed. Therefore, it is inferred that the crack stagnation nitrocarburized JIS SCM420 steel can be explained by a plastic-induced closure mechanism.
期刊介绍：
The journal ISIJ International first appeared in 1961 under the title Tetsu-to-Hagané Overseas. The title was changed in 1966 to Transactions of The Iron and Steel Institute of Japan and again in 1989 to the current ISIJ International.
The journal provides an international medium for the publication of fundamental and technological aspects of the properties, structure, characterization and modeling, processing, fabrication, and environmental issues of iron and steel, along with related engineering materials.
Classification
I Fundamentals of High Temperature Processes
II Ironmaking
III Steelmaking
IV Casting and Solidification
V Instrumentation, Control, and System Engineering
VI Chemical and Physical Analysis
VII Forming Processing and Thermomechanical Treatment
VIII Welding and Joining
IX Surface Treatment and Corrosion
X Transformations and Microstructures
XI Mechanical Properties
XII Physical Properties
XIII New Materials and Processes
XIV Social and Environmental Engineering.
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