Contribution to Improvement of Fatigue Properties of Zr-4 Alloy: Gradient Nanostructured Surface Layer versus Compressive Residual Stress

The gradient nanostructured (GNS) layer forms beneath the surface of Zr-4 samples by the surface mechanical grinding treatment (SMGT) process, which increases the fatigue strength apparently due to the synergistic effect of the gradient nanostructured layer and compressive residual stress. The SMGTe...

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Autores principales:	Donghui Geng, Qiaoyan Sun, Chao Xin, Lin Xiao
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	gradient nanostructured surface layer compressive residual stress Zr-4 alloy fatigue properties Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/61a4006f43f84d07a503d5e60e027fed
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spelling	oai:doaj.org-article:61a4006f43f84d07a503d5e60e027fed2021-11-25T18:32:39ZContribution to Improvement of Fatigue Properties of Zr-4 Alloy: Gradient Nanostructured Surface Layer versus Compressive Residual Stress10.3390/nano111131252079-4991https://doaj.org/article/61a4006f43f84d07a503d5e60e027fed2021-11-01T00:00:00Zhttps://www.mdpi.com/2079-4991/11/11/3125https://doaj.org/toc/2079-4991The gradient nanostructured (GNS) layer forms beneath the surface of Zr-4 samples by the surface mechanical grinding treatment (SMGT) process, which increases the fatigue strength apparently due to the synergistic effect of the gradient nanostructured layer and compressive residual stress. The SMGTed Zr-4 samples are subjected to annealing to remove residual stress (A-SMGT) and the individual effect of the GNS layer and compressive residual stress can be clarified. The results show that the gradient nanostructure in the surface is stable after annealing at 400 °C for 2 h but residual stress is apparently removed. Both SMGTed and A-SMGTed Zr-4 samples exhibit higher fatigue strength than that of coarse-grained (CG) Zr-4 alloy. The fatigue fracture of Zr-4 alloy indicates that the hard GNS surface layer hinders fatigue cracks from approaching the surface and leads to a lower fatigue striation space than that of CG Zr-4 samples. The offset fatigue strength of 10<sup>6</sup> cycles is taken for SMRT-ed, A-SMRT-ed, and CG Zr-4 samples and the results indicate clearly that the GNS surface layer is a key factor for the improvement of fatigue strength of the Zr-4 alloy with surface mechanical grinding treatment.Donghui GengQiaoyan SunChao XinLin XiaoMDPI AGarticlegradient nanostructured surface layercompressive residual stressZr-4 alloyfatigue propertiesChemistryQD1-999ENNanomaterials, Vol 11, Iss 3125, p 3125 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	gradient nanostructured surface layer compressive residual stress Zr-4 alloy fatigue properties Chemistry QD1-999
spellingShingle	gradient nanostructured surface layer compressive residual stress Zr-4 alloy fatigue properties Chemistry QD1-999 Donghui Geng Qiaoyan Sun Chao Xin Lin Xiao Contribution to Improvement of Fatigue Properties of Zr-4 Alloy: Gradient Nanostructured Surface Layer versus Compressive Residual Stress
description	The gradient nanostructured (GNS) layer forms beneath the surface of Zr-4 samples by the surface mechanical grinding treatment (SMGT) process, which increases the fatigue strength apparently due to the synergistic effect of the gradient nanostructured layer and compressive residual stress. The SMGTed Zr-4 samples are subjected to annealing to remove residual stress (A-SMGT) and the individual effect of the GNS layer and compressive residual stress can be clarified. The results show that the gradient nanostructure in the surface is stable after annealing at 400 °C for 2 h but residual stress is apparently removed. Both SMGTed and A-SMGTed Zr-4 samples exhibit higher fatigue strength than that of coarse-grained (CG) Zr-4 alloy. The fatigue fracture of Zr-4 alloy indicates that the hard GNS surface layer hinders fatigue cracks from approaching the surface and leads to a lower fatigue striation space than that of CG Zr-4 samples. The offset fatigue strength of 10<sup>6</sup> cycles is taken for SMRT-ed, A-SMRT-ed, and CG Zr-4 samples and the results indicate clearly that the GNS surface layer is a key factor for the improvement of fatigue strength of the Zr-4 alloy with surface mechanical grinding treatment.
format	article
author	Donghui Geng Qiaoyan Sun Chao Xin Lin Xiao
author_facet	Donghui Geng Qiaoyan Sun Chao Xin Lin Xiao
author_sort	Donghui Geng
title	Contribution to Improvement of Fatigue Properties of Zr-4 Alloy: Gradient Nanostructured Surface Layer versus Compressive Residual Stress
title_short	Contribution to Improvement of Fatigue Properties of Zr-4 Alloy: Gradient Nanostructured Surface Layer versus Compressive Residual Stress
title_full	Contribution to Improvement of Fatigue Properties of Zr-4 Alloy: Gradient Nanostructured Surface Layer versus Compressive Residual Stress
title_fullStr	Contribution to Improvement of Fatigue Properties of Zr-4 Alloy: Gradient Nanostructured Surface Layer versus Compressive Residual Stress
title_full_unstemmed	Contribution to Improvement of Fatigue Properties of Zr-4 Alloy: Gradient Nanostructured Surface Layer versus Compressive Residual Stress
title_sort	contribution to improvement of fatigue properties of zr-4 alloy: gradient nanostructured surface layer versus compressive residual stress
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/61a4006f43f84d07a503d5e60e027fed
work_keys_str_mv	AT donghuigeng contributiontoimprovementoffatiguepropertiesofzr4alloygradientnanostructuredsurfacelayerversuscompressiveresidualstress AT qiaoyansun contributiontoimprovementoffatiguepropertiesofzr4alloygradientnanostructuredsurfacelayerversuscompressiveresidualstress AT chaoxin contributiontoimprovementoffatiguepropertiesofzr4alloygradientnanostructuredsurfacelayerversuscompressiveresidualstress AT linxiao contributiontoimprovementoffatiguepropertiesofzr4alloygradientnanostructuredsurfacelayerversuscompressiveresidualstress
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Contribution to Improvement of Fatigue Properties of Zr-4 Alloy: Gradient Nanostructured Surface Layer versus Compressive Residual Stress

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