Strength gradient enhances fatigue resistance of steels

Steels are heavily used in infrastructure and the transportation industry, and enhancing their fatigue resistance is a major challenge in materials engineering. In this study, by introducing a gradient microstructure into 304 austenitic steel, which is one of the most widely used types of stainless...

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Main Authors:	Ma, Zhiwei, Liu, Jiabin, Wang, Gang, Wang, Hongtao, Wei, Yujie, Gao, Huajian
Format:	Online
Language:	English
Published:	Nature Publishing Group 2016
Online Access:	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4764920/

id	pubmed-4764920
recordtype	oai_dc
spelling	pubmed-47649202016-03-02 Strength gradient enhances fatigue resistance of steels Ma, Zhiwei Liu, Jiabin Wang, Gang Wang, Hongtao Wei, Yujie Gao, Huajian Article Steels are heavily used in infrastructure and the transportation industry, and enhancing their fatigue resistance is a major challenge in materials engineering. In this study, by introducing a gradient microstructure into 304 austenitic steel, which is one of the most widely used types of stainless steel, we show that a strength gradient substantially enhances the fatigue life of the material. Pre-notched samples with negative strength gradients in front of the notch’s tip endure many more fatigue cycles than do samples with positive strength gradients during the crack initiation stage, and samples with either type of gradient perform better than do gradient-free samples with the same average yield strength. However, as a crack grows, samples with positive strength gradients exhibit better resistance to fatigue crack propagation than do samples with negative gradients or no gradient. This study demonstrates a simple and promising strategy for using gradient structures to enhance the fatigue resistance of materials and complements related studies of strength and ductility. Nature Publishing Group 2016-02-24 /pmc/articles/PMC4764920/ /pubmed/26907708 http://dx.doi.org/10.1038/srep22156 Text en Copyright © 2016, Macmillan Publishers Limited http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
repository_type	Open Access Journal
institution_category	Foreign Institution
institution	US National Center for Biotechnology Information
building	NCBI PubMed
collection	Online Access
language	English
format	Online
author	Ma, Zhiwei Liu, Jiabin Wang, Gang Wang, Hongtao Wei, Yujie Gao, Huajian
spellingShingle	Ma, Zhiwei Liu, Jiabin Wang, Gang Wang, Hongtao Wei, Yujie Gao, Huajian Strength gradient enhances fatigue resistance of steels
author_facet	Ma, Zhiwei Liu, Jiabin Wang, Gang Wang, Hongtao Wei, Yujie Gao, Huajian
author_sort	Ma, Zhiwei
title	Strength gradient enhances fatigue resistance of steels
title_short	Strength gradient enhances fatigue resistance of steels
title_full	Strength gradient enhances fatigue resistance of steels
title_fullStr	Strength gradient enhances fatigue resistance of steels
title_full_unstemmed	Strength gradient enhances fatigue resistance of steels
title_sort	strength gradient enhances fatigue resistance of steels
description	Steels are heavily used in infrastructure and the transportation industry, and enhancing their fatigue resistance is a major challenge in materials engineering. In this study, by introducing a gradient microstructure into 304 austenitic steel, which is one of the most widely used types of stainless steel, we show that a strength gradient substantially enhances the fatigue life of the material. Pre-notched samples with negative strength gradients in front of the notch’s tip endure many more fatigue cycles than do samples with positive strength gradients during the crack initiation stage, and samples with either type of gradient perform better than do gradient-free samples with the same average yield strength. However, as a crack grows, samples with positive strength gradients exhibit better resistance to fatigue crack propagation than do samples with negative gradients or no gradient. This study demonstrates a simple and promising strategy for using gradient structures to enhance the fatigue resistance of materials and complements related studies of strength and ductility.
publisher	Nature Publishing Group
publishDate	2016
url	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4764920/
_version_	1613542507932549120

Strength gradient enhances fatigue resistance of steels

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