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Residual Stress and Fatigue of Metals (Second Edition)

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Dear Colleagues,

Nowadays, metals represent one of the fundamental pillars of social progress, as well as the material basis of national economic development. Many mechanical components and structures are made from metal materials. During the fabrication of these metal components, residual stresses are inevitably generated, which have a great influence on the structural integrity and service performance of the products. Whether involving traditional welding/joining/forming technology or newly developed additive manufacturing technology, residual stress has always been a key factor affecting the reliability of mechanical structures. Fatigue is the main failure mode of mechanical components and structures. Many observations of structural failure have shown that the location of fatigue failure is closely related to the distribution and magnitude of residual stress. Generally, tensile residual stress promotes fatigue and fracture failure, while compressive residual stress inhibits crack initiation and prolongs life. Therefore, the investigation of residual stress, fatigue and the relationship between them is of great significance to ensure the long life and safe operation of metal structures.

The goal of the present Special Issue is to examine the recent contributions in the field of residual stress and fatigue of metals. The topics of interest include, but are not limited to: experimental, theoretical and simulation analyses of residual stress, residual stress reduction, fatigue life prediction, damage analysis, and fatigue life improvement via any engineering technologies, including design, process control and surface treatment, etc.

Authors are invited to publish their research results on all of these topics, and therefore, we believe that this Special Issue will sufficiently demonstrate the recent advances in the residual stress and fatigue of metals.

Dr. Yun Luo
Dr. Pengcheng Zhao
Dr. Huai Wang
Guest Editors

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Keywords

residual stress
fatigue
life assessment
welding and brazing
forming
simulation
measurement
controlling

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14 pages, 5454 KiB

Open AccessArticle

Hardening Behavior and Model of a 316L Sheet Considering Macro and Micro Size Effects

by Qian Zhang, Weige Meng and Yun Luo

Metals 2023, 13(12), 1926; https://doi.org/10.3390/met13121926 - 23 Nov 2023

Viewed by 659

Abstract

316L stainless steel is often used as the metal bipolar plate, which is a key component of fuel cells. For the thinner metal bipolar plates, the mechanical properties may be different for different specimen sizes. In this paper, the mechanical properties, metallographic structure, and hardening behavior of 316L stainless steel sheets with different grain sizes and specimen thickness were studied. Several mathematical models were selected to describe the hardening behavior of 316L stainless steel sheet. A correlated hardening model of 316L stainless steel was established, considering the specimen and grain size effect. The results show that the specimen thickness has no effect on the microstructure and grain size, but the austenite grain size increases gradually with an increase in holding time. With a decrease in plate thickness and an increase in grain size, the strength decreases. Compared to the 0.1 mm sheet, the yield strength and tensile strength for the 0.9 mm sheet are increased by 48% and 24%, respectively. The yield strength and tensile strength are decreased by nearly half after 20 min heat treatment due to the grain size growth. The thicker the sample and higher the grain size is, the higher the hardening rate is. The predicted stress–strain by established correlated hardening model has a good agreement with the experiment curves. Full article

(This article belongs to the Special Issue Residual Stress and Fatigue of Metals (Second Edition))

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