The effects of process variables on the hardness of nitrided 3% chromium steel

To achieve higher surface hardnesses with a steep hardness profile of the nitrided case is one of the main objectives of nitriding of commercial low-alloy steels. The effects of nitriding process variables and prior austenitizing and tempering temperatures have been investigated using En40B steels g...

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Main Authors:	Mridha, Shahjahan, Khan, Ahsan Ali
Format:	Article
Language:	English
Published:	Elsevier BV 2008
Subjects:	TS200 Metal manufactures. Metalworking
Online Access:	http://irep.iium.edu.my/7831/ http://irep.iium.edu.my/7831/ http://irep.iium.edu.my/7831/ http://irep.iium.edu.my/7831/1/2008_Shahjahan.pdf

id	iium-7831
recordtype	eprints
spelling	iium-78312013-07-18T04:02:13Z http://irep.iium.edu.my/7831/ The effects of process variables on the hardness of nitrided 3% chromium steel Mridha, Shahjahan Khan, Ahsan Ali TS200 Metal manufactures. Metalworking To achieve higher surface hardnesses with a steep hardness profile of the nitrided case is one of the main objectives of nitriding of commercial low-alloy steels. The effects of nitriding process variables and prior austenitizing and tempering temperatures have been investigated using En40B steels gas—nitrided at 470, 520 and 570 °C in different nitriding potentials for up to 96 h. The surface hardness was found to increase with increasing nitriding potential. The steeper hardness profiles and higher surface hardness were attained at the lower nitriding temperatures and higher nitriding potentials. With increasing nitriding temperatures, the surface hardness decreased and the hardness profile became shallower. The treatment time was found to have little effect on the surface hardness and the combined hardness curves obtained after different nitriding times gave the appearance of a hysteresis loop. The prior austenitizing temperatures appeared to have no influence on hardness. With increasing tempering temperatures the surface hardness of the nitrided case was observed to decrease and the hardness profile became shallower especially when nitrided at 570 °C. The decrease in surface hardness at higher nitriding temperatures is considered to be due to coarsening of the nitride particles, CrN, and the shallower hardness build up due to coarser alloy nitride precipitation which has actually transformed from large carbide particles formed during prior tempering at higher temperatures and in the carburized layer (CL). Elsevier BV 2008 Article PeerReviewed application/pdf en http://irep.iium.edu.my/7831/1/2008_Shahjahan.pdf Mridha, Shahjahan and Khan, Ahsan Ali (2008) The effects of process variables on the hardness of nitrided 3% chromium steel. Journal of Materials Processing Technology, 201 (1-3). pp. 325-330. ISSN 0924-0136 http://www.sciencedirect.com/science/article/pii/S0924013607012459 http://dx.doi.org/10.1016/j.jmatprotec.2007.11.142
repository_type	Digital Repository
institution_category	Local University
institution	International Islamic University Malaysia
building	IIUM Repository
collection	Online Access
language	English
topic	TS200 Metal manufactures. Metalworking
spellingShingle	TS200 Metal manufactures. Metalworking Mridha, Shahjahan Khan, Ahsan Ali The effects of process variables on the hardness of nitrided 3% chromium steel
description	To achieve higher surface hardnesses with a steep hardness profile of the nitrided case is one of the main objectives of nitriding of commercial low-alloy steels. The effects of nitriding process variables and prior austenitizing and tempering temperatures have been investigated using En40B steels gas—nitrided at 470, 520 and 570 °C in different nitriding potentials for up to 96 h. The surface hardness was found to increase with increasing nitriding potential. The steeper hardness profiles and higher surface hardness were attained at the lower nitriding temperatures and higher nitriding potentials. With increasing nitriding temperatures, the surface hardness decreased and the hardness profile became shallower. The treatment time was found to have little effect on the surface hardness and the combined hardness curves obtained after different nitriding times gave the appearance of a hysteresis loop. The prior austenitizing temperatures appeared to have no influence on hardness. With increasing tempering temperatures the surface hardness of the nitrided case was observed to decrease and the hardness profile became shallower especially when nitrided at 570 °C. The decrease in surface hardness at higher nitriding temperatures is considered to be due to coarsening of the nitride particles, CrN, and the shallower hardness build up due to coarser alloy nitride precipitation which has actually transformed from large carbide particles formed during prior tempering at higher temperatures and in the carburized layer (CL).
format	Article
author	Mridha, Shahjahan Khan, Ahsan Ali
author_facet	Mridha, Shahjahan Khan, Ahsan Ali
author_sort	Mridha, Shahjahan
title	The effects of process variables on the hardness of nitrided 3% chromium steel
title_short	The effects of process variables on the hardness of nitrided 3% chromium steel
title_full	The effects of process variables on the hardness of nitrided 3% chromium steel
title_fullStr	The effects of process variables on the hardness of nitrided 3% chromium steel
title_full_unstemmed	The effects of process variables on the hardness of nitrided 3% chromium steel
title_sort	effects of process variables on the hardness of nitrided 3% chromium steel
publisher	Elsevier BV
publishDate	2008
url	http://irep.iium.edu.my/7831/ http://irep.iium.edu.my/7831/ http://irep.iium.edu.my/7831/ http://irep.iium.edu.my/7831/1/2008_Shahjahan.pdf
first_indexed	2023-09-18T20:17:22Z
last_indexed	2023-09-18T20:17:22Z
_version_	1777407877817827328

The effects of process variables on the hardness of nitrided 3% chromium steel

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