氮碳化JIS SCM420钢旋转弯曲疲劳试验中的裂纹扩展行为

IF 0.3 4区材料科学 Q4 METALLURGY & METALLURGICAL ENGINEERING

Tetsu To Hagane-journal of The Iron and Steel Institute of Japan Pub Date : 2023-08-15 DOI:10.2355/tetsutohagane.tetsu-2022-034

Naoya Ihara, Takashi Iwamoto, K. Nishimura

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引用次数: 0

摘要

通过旋转弯曲疲劳试验，研究了氮碳化JIS SCM420钢的裂纹扩展行为，重点研究了裂纹停滞行为。在疲劳极限为400 MPa时，裂纹在长度约200µm处出现明显的停滞，说明裂纹停滞对疲劳强度具有控制作用。裂纹停滞不能仅仅用应力强度因子的变化来解释，因为该过程的计算值随着距缺口深度的增加而增加。通过EBSD分析，在裂纹尖端周围观察到大量的塑性应变。由于停滞位置对应于氮碳共渗形成的硬化区和未硬化区之间的临界深度，因此很容易变形。因此，可以推断JIS SCM420氮碳渗碳钢裂纹滞止可以用塑性闭合机制来解释。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Crack Propagation Behavior in Rotational Bending Fatigue Test of Nitrocarburized JIS SCM420 Steel

: 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.

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来源期刊

Tetsu To Hagane-journal of The Iron and Steel Institute of Japan 工程技术-冶金工程

CiteScore

0.70

自引率

33.30%

发文量

审稿时长

6-12 weeks

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.