Exploratory studies on grain refinement in medium chromium ferritic stainless steel welds

The fusion welding of ferritic stainless steel is associated with several challenges principal among which is the grain coarsening in and around the weld section. This leads to loss in ductility and toughness. It may be possible to improve ductility in the ferritic weld if refined grain structure c...

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Main Authors:	Amuda, Muhammed Olawale Hakeem, Mridha, Shahjahan
Format:	Article
Language:	English
Published:	Information Engineering Research Institute (IERI) 2011
Subjects:	TN600 Metallurgy
Online Access:	http://irep.iium.edu.my/9588/ http://irep.iium.edu.my/9588/ http://irep.iium.edu.my/9588/1/1.pdf

id	iium-9588
recordtype	eprints
spelling	iium-95882011-12-12T13:11:00Z http://irep.iium.edu.my/9588/ Exploratory studies on grain refinement in medium chromium ferritic stainless steel welds Amuda, Muhammed Olawale Hakeem Mridha, Shahjahan TN600 Metallurgy The fusion welding of ferritic stainless steel is associated with several challenges principal among which is the grain coarsening in and around the weld section. This leads to loss in ductility and toughness. It may be possible to improve ductility in the ferritic weld if refined grain structure can be produced. Available literatures indicate that formation of refined grains in weld is promoted by ensuring low net heat input and faster transfer dynamics. This may be achieved by controlling the proportion of arc heat input that is actually delivered to the workpiece or enhancing the solidification process by artificially agitating the weld pool. Addition of elemental powder ex-situ as well as the use of cryogenic cooling offer means for controlling net heat input and ensuring faster cooling from the grain coarsening temperature. In the present work, exploratory studies are conducted on grain refinement in medium chromium ferritic stainless steel weld via ex-situ elemental powder addition and cryogenic cooling. It emerged from the study that grain refinement averaged 40% with cryogenic cooling, 35% with aluminum and titanium, 55%. The refinement from cryogenic cooling is due to the steep thermal gradient provided by the cooling liquid while ex-situ elemental powders provide sites for heterogeneous nucleation of equiaxed grains leading to higher microhardness value which is indicative of greater resistance to flow stress and a measure of strength. Information Engineering Research Institute (IERI) 2011 Article PeerReviewed application/pdf en http://irep.iium.edu.my/9588/1/1.pdf Amuda, Muhammed Olawale Hakeem and Mridha, Shahjahan (2011) Exploratory studies on grain refinement in medium chromium ferritic stainless steel welds. Lecture Notes in Information Technology, 1-2. pp. 358-365. ISSN 2070-1918 http://www.ier-institute.org/2070-1918.html
repository_type	Digital Repository
institution_category	Local University
institution	International Islamic University Malaysia
building	IIUM Repository
collection	Online Access
language	English
topic	TN600 Metallurgy
spellingShingle	TN600 Metallurgy Amuda, Muhammed Olawale Hakeem Mridha, Shahjahan Exploratory studies on grain refinement in medium chromium ferritic stainless steel welds
description	The fusion welding of ferritic stainless steel is associated with several challenges principal among which is the grain coarsening in and around the weld section. This leads to loss in ductility and toughness. It may be possible to improve ductility in the ferritic weld if refined grain structure can be produced. Available literatures indicate that formation of refined grains in weld is promoted by ensuring low net heat input and faster transfer dynamics. This may be achieved by controlling the proportion of arc heat input that is actually delivered to the workpiece or enhancing the solidification process by artificially agitating the weld pool. Addition of elemental powder ex-situ as well as the use of cryogenic cooling offer means for controlling net heat input and ensuring faster cooling from the grain coarsening temperature. In the present work, exploratory studies are conducted on grain refinement in medium chromium ferritic stainless steel weld via ex-situ elemental powder addition and cryogenic cooling. It emerged from the study that grain refinement averaged 40% with cryogenic cooling, 35% with aluminum and titanium, 55%. The refinement from cryogenic cooling is due to the steep thermal gradient provided by the cooling liquid while ex-situ elemental powders provide sites for heterogeneous nucleation of equiaxed grains leading to higher microhardness value which is indicative of greater resistance to flow stress and a measure of strength.
format	Article
author	Amuda, Muhammed Olawale Hakeem Mridha, Shahjahan
author_facet	Amuda, Muhammed Olawale Hakeem Mridha, Shahjahan
author_sort	Amuda, Muhammed Olawale Hakeem
title	Exploratory studies on grain refinement in medium chromium ferritic stainless steel welds
title_short	Exploratory studies on grain refinement in medium chromium ferritic stainless steel welds
title_full	Exploratory studies on grain refinement in medium chromium ferritic stainless steel welds
title_fullStr	Exploratory studies on grain refinement in medium chromium ferritic stainless steel welds
title_full_unstemmed	Exploratory studies on grain refinement in medium chromium ferritic stainless steel welds
title_sort	exploratory studies on grain refinement in medium chromium ferritic stainless steel welds
publisher	Information Engineering Research Institute (IERI)
publishDate	2011
url	http://irep.iium.edu.my/9588/ http://irep.iium.edu.my/9588/ http://irep.iium.edu.my/9588/1/1.pdf
first_indexed	2023-09-18T20:19:14Z
last_indexed	2023-09-18T20:19:14Z
_version_	1777407995332788224

Exploratory studies on grain refinement in medium chromium ferritic stainless steel welds

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