Interpretation of surficial shear crack propagation mechanisms in bending for Zn or AlSi coated hot press forming steels

Abstract The bending angle at the peak load is regarded as the most important parameter for evaluating bending properties of hot-press-forming (HPF) steels. However, it is not a mechanics-based parameter for the bending criterion, and the data interpretation is difficult because bending criteria in...

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Autores principales:	Selim Kim, Min Cheol Jo, Seongwoo Kim, Jinkeun Oh, Sang-Heon Kim, Seok Su Sohn, Sunghak Lee
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/e2207ca3cac04bf4b2402746f816c11e
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spelling	oai:doaj.org-article:e2207ca3cac04bf4b2402746f816c11e2021-12-02T18:25:04ZInterpretation of surficial shear crack propagation mechanisms in bending for Zn or AlSi coated hot press forming steels10.1038/s41598-021-91065-x2045-2322https://doaj.org/article/e2207ca3cac04bf4b2402746f816c11e2021-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-91065-xhttps://doaj.org/toc/2045-2322Abstract The bending angle at the peak load is regarded as the most important parameter for evaluating bending properties of hot-press-forming (HPF) steels. However, it is not a mechanics-based parameter for the bending criterion, and the data interpretation is difficult because bending criteria in relation with microstructures and associated bending mechanisms have not been verified yet. In this study, effects of coating and baking treatments on bending angles at the peak load of three kinds of 1470 MPa-grade HPF steels were investigated by interrupted three-point bending tests coupled with direct microstructural observation. According to direct observations of sequential cracking processes of V-shaped crack (V-crack), bending procedures were classified into four stages: (1) formation of small V-crack, (2) increase in number and size of V-cracks, (3) initiation of shear-crack propagation from the V-crack tip, and (4) further propagation and opening of the shear crack. The minimum bending angle required for initiating the shear-crack propagation from the V-crack tip was defined as a critical angle, which meant the boundary between the 2nd and 3rd stages. The present bending behavior related with critical bending angle and V-cracking could be interpreted similarly by the fracture-mechanics concept, i.e., the initiation of shear-crack propagation.Selim KimMin Cheol JoSeongwoo KimJinkeun OhSang-Heon KimSeok Su SohnSunghak LeeNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-11 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Selim Kim Min Cheol Jo Seongwoo Kim Jinkeun Oh Sang-Heon Kim Seok Su Sohn Sunghak Lee Interpretation of surficial shear crack propagation mechanisms in bending for Zn or AlSi coated hot press forming steels
description	Abstract The bending angle at the peak load is regarded as the most important parameter for evaluating bending properties of hot-press-forming (HPF) steels. However, it is not a mechanics-based parameter for the bending criterion, and the data interpretation is difficult because bending criteria in relation with microstructures and associated bending mechanisms have not been verified yet. In this study, effects of coating and baking treatments on bending angles at the peak load of three kinds of 1470 MPa-grade HPF steels were investigated by interrupted three-point bending tests coupled with direct microstructural observation. According to direct observations of sequential cracking processes of V-shaped crack (V-crack), bending procedures were classified into four stages: (1) formation of small V-crack, (2) increase in number and size of V-cracks, (3) initiation of shear-crack propagation from the V-crack tip, and (4) further propagation and opening of the shear crack. The minimum bending angle required for initiating the shear-crack propagation from the V-crack tip was defined as a critical angle, which meant the boundary between the 2nd and 3rd stages. The present bending behavior related with critical bending angle and V-cracking could be interpreted similarly by the fracture-mechanics concept, i.e., the initiation of shear-crack propagation.
format	article
author	Selim Kim Min Cheol Jo Seongwoo Kim Jinkeun Oh Sang-Heon Kim Seok Su Sohn Sunghak Lee
author_facet	Selim Kim Min Cheol Jo Seongwoo Kim Jinkeun Oh Sang-Heon Kim Seok Su Sohn Sunghak Lee
author_sort	Selim Kim
title	Interpretation of surficial shear crack propagation mechanisms in bending for Zn or AlSi coated hot press forming steels
title_short	Interpretation of surficial shear crack propagation mechanisms in bending for Zn or AlSi coated hot press forming steels
title_full	Interpretation of surficial shear crack propagation mechanisms in bending for Zn or AlSi coated hot press forming steels
title_fullStr	Interpretation of surficial shear crack propagation mechanisms in bending for Zn or AlSi coated hot press forming steels
title_full_unstemmed	Interpretation of surficial shear crack propagation mechanisms in bending for Zn or AlSi coated hot press forming steels
title_sort	interpretation of surficial shear crack propagation mechanisms in bending for zn or alsi coated hot press forming steels
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/e2207ca3cac04bf4b2402746f816c11e
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Interpretation of surficial shear crack propagation mechanisms in bending for Zn or AlSi coated hot press forming steels

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