Effect of Quenching and Partitioning Heat Treatment on the Fatigue Behavior of 42SiCr Steel

The manufacturing of advanced high-strength steels with enhanced ductility is a persistent aim of research. The ability of a material to absorb high loads while showing a high deformation behavior is a major task for many industrial fields like the mobility sector. Therefore, the material properties...

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Autores principales:	Marco Thomä, Guntram Wagner
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	quenching and partitioning QP-steels mechanical properties fatigue 42SiCr steel heat treatment Mining engineering. Metallurgy TN1-997
Acceso en línea:	https://doaj.org/article/bbadd8b4476d437592a025e26ef2df60
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spelling	oai:doaj.org-article:bbadd8b4476d437592a025e26ef2df602021-11-25T18:21:18ZEffect of Quenching and Partitioning Heat Treatment on the Fatigue Behavior of 42SiCr Steel10.3390/met111116992075-4701https://doaj.org/article/bbadd8b4476d437592a025e26ef2df602021-10-01T00:00:00Zhttps://www.mdpi.com/2075-4701/11/11/1699https://doaj.org/toc/2075-4701The manufacturing of advanced high-strength steels with enhanced ductility is a persistent aim of research. The ability of a material to absorb high loads while showing a high deformation behavior is a major task for many industrial fields like the mobility sector. Therefore, the material properties of advanced high-strength steels are one of the most important impact factors on the resulting cyclic fatigue behavior. To adjust advanced material properties, resulting in high tensile strengths as well as an enhanced ductility, the heat treatment process of quenching and partitioning (QP) was developed. The quenching takes place in a field between martensite start and martensite finish temperature and the subsequent partitioning is executed at slightly elevated temperatures. Regarding the sparsely investigated field of fatigue research on quenched and partitioned steels, the present work investigates the influence of a QP heat treatment on the resulting microstructure by light and scanning electron microscopy as well as on the mechanical properties such as tensile strength and resistance against fatigue regarding two different heat treatment conditions (QP1, QP2) in comparison to the cold-rolled base material of 42SiCr steel. Therefore, the microscopic analysis proved the presence of a characteristic quenched and partitioned microstructure consisting of a martensitic matrix and partial areas of retained austenite, whereas carbides were also present. Differences in the amount of retained austenite could be observed by using X-ray diffraction (XRD) for the different QP routes, which influence the mechanical properties resulting in higher tensile strength of about 2000 MPa for QP1 compared to about 1600 MPa for QP2. Furthermore, the transition for the fatigue limit was approximated by using stepwise load increase tests (LIT) and afterwards verified by constant amplitude tests (CAT) in accordance with the staircase method, whereas the QP1 condition reached the highest fatigue strength of 900 MPa. Subsequent light and scanning electron microscopy of selected fractured surfaces and runouts showed a different behavior regarding the size of the fatigue fracture area and also differences in the microstructure of these runouts.Marco ThomäGuntram WagnerMDPI AGarticlequenching and partitioningQP-steelsmechanical propertiesfatigue42SiCr steelheat treatmentMining engineering. MetallurgyTN1-997ENMetals, Vol 11, Iss 1699, p 1699 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	quenching and partitioning QP-steels mechanical properties fatigue 42SiCr steel heat treatment Mining engineering. Metallurgy TN1-997
spellingShingle	quenching and partitioning QP-steels mechanical properties fatigue 42SiCr steel heat treatment Mining engineering. Metallurgy TN1-997 Marco Thomä Guntram Wagner Effect of Quenching and Partitioning Heat Treatment on the Fatigue Behavior of 42SiCr Steel
description	The manufacturing of advanced high-strength steels with enhanced ductility is a persistent aim of research. The ability of a material to absorb high loads while showing a high deformation behavior is a major task for many industrial fields like the mobility sector. Therefore, the material properties of advanced high-strength steels are one of the most important impact factors on the resulting cyclic fatigue behavior. To adjust advanced material properties, resulting in high tensile strengths as well as an enhanced ductility, the heat treatment process of quenching and partitioning (QP) was developed. The quenching takes place in a field between martensite start and martensite finish temperature and the subsequent partitioning is executed at slightly elevated temperatures. Regarding the sparsely investigated field of fatigue research on quenched and partitioned steels, the present work investigates the influence of a QP heat treatment on the resulting microstructure by light and scanning electron microscopy as well as on the mechanical properties such as tensile strength and resistance against fatigue regarding two different heat treatment conditions (QP1, QP2) in comparison to the cold-rolled base material of 42SiCr steel. Therefore, the microscopic analysis proved the presence of a characteristic quenched and partitioned microstructure consisting of a martensitic matrix and partial areas of retained austenite, whereas carbides were also present. Differences in the amount of retained austenite could be observed by using X-ray diffraction (XRD) for the different QP routes, which influence the mechanical properties resulting in higher tensile strength of about 2000 MPa for QP1 compared to about 1600 MPa for QP2. Furthermore, the transition for the fatigue limit was approximated by using stepwise load increase tests (LIT) and afterwards verified by constant amplitude tests (CAT) in accordance with the staircase method, whereas the QP1 condition reached the highest fatigue strength of 900 MPa. Subsequent light and scanning electron microscopy of selected fractured surfaces and runouts showed a different behavior regarding the size of the fatigue fracture area and also differences in the microstructure of these runouts.
format	article
author	Marco Thomä Guntram Wagner
author_facet	Marco Thomä Guntram Wagner
author_sort	Marco Thomä
title	Effect of Quenching and Partitioning Heat Treatment on the Fatigue Behavior of 42SiCr Steel
title_short	Effect of Quenching and Partitioning Heat Treatment on the Fatigue Behavior of 42SiCr Steel
title_full	Effect of Quenching and Partitioning Heat Treatment on the Fatigue Behavior of 42SiCr Steel
title_fullStr	Effect of Quenching and Partitioning Heat Treatment on the Fatigue Behavior of 42SiCr Steel
title_full_unstemmed	Effect of Quenching and Partitioning Heat Treatment on the Fatigue Behavior of 42SiCr Steel
title_sort	effect of quenching and partitioning heat treatment on the fatigue behavior of 42sicr steel
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/bbadd8b4476d437592a025e26ef2df60
work_keys_str_mv	AT marcothoma effectofquenchingandpartitioningheattreatmentonthefatiguebehaviorof42sicrsteel AT guntramwagner effectofquenchingandpartitioningheattreatmentonthefatiguebehaviorof42sicrsteel
_version_	1718411281752391680

Effect of Quenching and Partitioning Heat Treatment on the Fatigue Behavior of 42SiCr Steel

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