Structural Characteristics and Sliding Friction Properties of 40CrNiMo Steel after Broadband Laser Hardening

The surface of 40CrNiMo steel, which is commonly used for the sprag clutch wedge, is prone to wear. In this study, hardening of the matrix material was conducted by broadband-laser scanning at various scanning speeds. The hardness distribution and structure evolution were analyzed along the vertical...

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Autores principales:	Jia Li, Hongzhi Yan, Songbai Li, Yin Zhang, Pengfei Zhu
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	laser hardening scanning speed structural characteristics friction Engineering (General). Civil engineering (General) TA1-2040
Acceso en línea:	https://doaj.org/article/1d4f6f67150e4fb3bdf9a206f78bd5e8
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id	oai:doaj.org-article:1d4f6f67150e4fb3bdf9a206f78bd5e8
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spelling	oai:doaj.org-article:1d4f6f67150e4fb3bdf9a206f78bd5e82021-11-25T17:15:32ZStructural Characteristics and Sliding Friction Properties of 40CrNiMo Steel after Broadband Laser Hardening10.3390/coatings111112822079-6412https://doaj.org/article/1d4f6f67150e4fb3bdf9a206f78bd5e82021-10-01T00:00:00Zhttps://www.mdpi.com/2079-6412/11/11/1282https://doaj.org/toc/2079-6412The surface of 40CrNiMo steel, which is commonly used for the sprag clutch wedge, is prone to wear. In this study, hardening of the matrix material was conducted by broadband-laser scanning at various scanning speeds. The hardness distribution and structure evolution were analyzed along the vertical direction. Characteristics of the hardened layer were explored using scanning electron microscopy, transmission electron microscopy, and X-ray diffractometry. The friction coefficient, wear amount, and wear morphology of sliding friction against GCr15 steel were investigated under various conditions. The results show that the depth of the hardened zone decreases with increasing scanning speed. Under the experimental power and defocus, a laser scanning speed between 700–1020 mm/min can meet the general surface requirements of the sprag clutch wedge. After laser hardening, the main components of the hardened layer included lath-shaped and needle-shaped martensite and retained austenite. In terms of friction and wear, when the relative movement speed was within 300–500 mm/min, the relative movement speed decreased and the normal force increased, which led to an increase in the friction coefficient and its fluctuation, as well as an increase in wear volume of the hardened layer. The wear mechanism of the hardened layer included abrasive wear, adhesive wear, and oxidative wear. Excessive normal force resulted in obvious delamination of the sample. Within the scope of the experiment, the best laser hardening results were obtained with a scanning speed of 800 mm/min.Jia LiHongzhi YanSongbai LiYin ZhangPengfei ZhuMDPI AGarticlelaser hardeningscanning speedstructural characteristicsfrictionEngineering (General). Civil engineering (General)TA1-2040ENCoatings, Vol 11, Iss 1282, p 1282 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	laser hardening scanning speed structural characteristics friction Engineering (General). Civil engineering (General) TA1-2040
spellingShingle	laser hardening scanning speed structural characteristics friction Engineering (General). Civil engineering (General) TA1-2040 Jia Li Hongzhi Yan Songbai Li Yin Zhang Pengfei Zhu Structural Characteristics and Sliding Friction Properties of 40CrNiMo Steel after Broadband Laser Hardening
description	The surface of 40CrNiMo steel, which is commonly used for the sprag clutch wedge, is prone to wear. In this study, hardening of the matrix material was conducted by broadband-laser scanning at various scanning speeds. The hardness distribution and structure evolution were analyzed along the vertical direction. Characteristics of the hardened layer were explored using scanning electron microscopy, transmission electron microscopy, and X-ray diffractometry. The friction coefficient, wear amount, and wear morphology of sliding friction against GCr15 steel were investigated under various conditions. The results show that the depth of the hardened zone decreases with increasing scanning speed. Under the experimental power and defocus, a laser scanning speed between 700–1020 mm/min can meet the general surface requirements of the sprag clutch wedge. After laser hardening, the main components of the hardened layer included lath-shaped and needle-shaped martensite and retained austenite. In terms of friction and wear, when the relative movement speed was within 300–500 mm/min, the relative movement speed decreased and the normal force increased, which led to an increase in the friction coefficient and its fluctuation, as well as an increase in wear volume of the hardened layer. The wear mechanism of the hardened layer included abrasive wear, adhesive wear, and oxidative wear. Excessive normal force resulted in obvious delamination of the sample. Within the scope of the experiment, the best laser hardening results were obtained with a scanning speed of 800 mm/min.
format	article
author	Jia Li Hongzhi Yan Songbai Li Yin Zhang Pengfei Zhu
author_facet	Jia Li Hongzhi Yan Songbai Li Yin Zhang Pengfei Zhu
author_sort	Jia Li
title	Structural Characteristics and Sliding Friction Properties of 40CrNiMo Steel after Broadband Laser Hardening
title_short	Structural Characteristics and Sliding Friction Properties of 40CrNiMo Steel after Broadband Laser Hardening
title_full	Structural Characteristics and Sliding Friction Properties of 40CrNiMo Steel after Broadband Laser Hardening
title_fullStr	Structural Characteristics and Sliding Friction Properties of 40CrNiMo Steel after Broadband Laser Hardening
title_full_unstemmed	Structural Characteristics and Sliding Friction Properties of 40CrNiMo Steel after Broadband Laser Hardening
title_sort	structural characteristics and sliding friction properties of 40crnimo steel after broadband laser hardening
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/1d4f6f67150e4fb3bdf9a206f78bd5e8
work_keys_str_mv	AT jiali structuralcharacteristicsandslidingfrictionpropertiesof40crnimosteelafterbroadbandlaserhardening AT hongzhiyan structuralcharacteristicsandslidingfrictionpropertiesof40crnimosteelafterbroadbandlaserhardening AT songbaili structuralcharacteristicsandslidingfrictionpropertiesof40crnimosteelafterbroadbandlaserhardening AT yinzhang structuralcharacteristicsandslidingfrictionpropertiesof40crnimosteelafterbroadbandlaserhardening AT pengfeizhu structuralcharacteristicsandslidingfrictionpropertiesof40crnimosteelafterbroadbandlaserhardening
_version_	1718412575701467136

Structural Characteristics and Sliding Friction Properties of 40CrNiMo Steel after Broadband Laser Hardening

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