Morphology, topography, and hardness of diffusion bonded sialon to AISI 420 at different bonding time

Sialon and AISI 420 martensitic stainless steel were diffusion bonded in order to study the effect of bonding time on reaction layer's growth. Joining of these materials was conducted at 1200°C under a uniaxial pressure of 17 MPa in a vacuum ranging from 5.0 to 8.0�10 -6 Torr with bonding tim...

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Main Authors: Ibrahim, N.N.M., Hussain, P., Awang, M.
Format: Conference or Workshop Item
Published: American Institute of Physics Inc. 2015
Online Access:https://www.scopus.com/inward/record.uri?eid=2-s2.0-85063846640&doi=10.1063%2f1.4919173&partnerID=40&md5=160c1680db50663785f2615b17c16b6a
http://eprints.utp.edu.my/31440/
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spelling my.utp.eprints.314402022-03-26T03:19:51Z Morphology, topography, and hardness of diffusion bonded sialon to AISI 420 at different bonding time Ibrahim, N.N.M. Hussain, P. Awang, M. Sialon and AISI 420 martensitic stainless steel were diffusion bonded in order to study the effect of bonding time on reaction layer's growth. Joining of these materials was conducted at 1200°C under a uniaxial pressure of 17 MPa in a vacuum ranging from 5.0 to 8.0�10 -6 Torr with bonding time varied for 0.5, 2, and 3 h. Thicker reaction layer was formed in longer bonded sample since the elements from sialon could diffuse further into the steel. Sialon retained its microstructure but it was affected at the initial contact with the steel to form the new interface layer. Diffusion layer grew toward the steel and it was segregated with the parent steel as a result of the difference in properties between these regions. The segregation formed a stream-like structure and its depth decreased when the bonding time was increased. The microstructure of the steel transformed into large grain size with precipitates. Prolonging the bonding time produced more precipitates in the steel and reduced the steel thickness as well. Interdiffusions of elements occurred between the joined materials and the concentrations were decreasing toward the steel and vice versa. Silicon easily diffused into the steel because it possessed lower ionization potential compared to nitrogen. Formation of silicide and other compounds such as carbides were detected in the interface layer and steel grain boundary, respectively. These compounds were harmful due to silicide brittleness and precipitation of carbides in the grain boundary might cause intergranular corrosion cracking. Sialon retained its hardness but it dropped very low at the interface layer. The absence of crack at the joint in all samples could be contributed from the ductility characteristic of the reaction layer which compensated the residual stress that was formed upon the cooling process. © 2015 AIP Publishing LLC. American Institute of Physics Inc. 2015 Conference or Workshop Item NonPeerReviewed https://www.scopus.com/inward/record.uri?eid=2-s2.0-85063846640&doi=10.1063%2f1.4919173&partnerID=40&md5=160c1680db50663785f2615b17c16b6a Ibrahim, N.N.M. and Hussain, P. and Awang, M. (2015) Morphology, topography, and hardness of diffusion bonded sialon to AISI 420 at different bonding time. In: UNSPECIFIED. http://eprints.utp.edu.my/31440/
institution Universiti Teknologi Petronas
building UTP Resource Centre
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Petronas
content_source UTP Institutional Repository
url_provider http://eprints.utp.edu.my/
description Sialon and AISI 420 martensitic stainless steel were diffusion bonded in order to study the effect of bonding time on reaction layer's growth. Joining of these materials was conducted at 1200°C under a uniaxial pressure of 17 MPa in a vacuum ranging from 5.0 to 8.0�10 -6 Torr with bonding time varied for 0.5, 2, and 3 h. Thicker reaction layer was formed in longer bonded sample since the elements from sialon could diffuse further into the steel. Sialon retained its microstructure but it was affected at the initial contact with the steel to form the new interface layer. Diffusion layer grew toward the steel and it was segregated with the parent steel as a result of the difference in properties between these regions. The segregation formed a stream-like structure and its depth decreased when the bonding time was increased. The microstructure of the steel transformed into large grain size with precipitates. Prolonging the bonding time produced more precipitates in the steel and reduced the steel thickness as well. Interdiffusions of elements occurred between the joined materials and the concentrations were decreasing toward the steel and vice versa. Silicon easily diffused into the steel because it possessed lower ionization potential compared to nitrogen. Formation of silicide and other compounds such as carbides were detected in the interface layer and steel grain boundary, respectively. These compounds were harmful due to silicide brittleness and precipitation of carbides in the grain boundary might cause intergranular corrosion cracking. Sialon retained its hardness but it dropped very low at the interface layer. The absence of crack at the joint in all samples could be contributed from the ductility characteristic of the reaction layer which compensated the residual stress that was formed upon the cooling process. © 2015 AIP Publishing LLC.
format Conference or Workshop Item
author Ibrahim, N.N.M.
Hussain, P.
Awang, M.
spellingShingle Ibrahim, N.N.M.
Hussain, P.
Awang, M.
Morphology, topography, and hardness of diffusion bonded sialon to AISI 420 at different bonding time
author_facet Ibrahim, N.N.M.
Hussain, P.
Awang, M.
author_sort Ibrahim, N.N.M.
title Morphology, topography, and hardness of diffusion bonded sialon to AISI 420 at different bonding time
title_short Morphology, topography, and hardness of diffusion bonded sialon to AISI 420 at different bonding time
title_full Morphology, topography, and hardness of diffusion bonded sialon to AISI 420 at different bonding time
title_fullStr Morphology, topography, and hardness of diffusion bonded sialon to AISI 420 at different bonding time
title_full_unstemmed Morphology, topography, and hardness of diffusion bonded sialon to AISI 420 at different bonding time
title_sort morphology, topography, and hardness of diffusion bonded sialon to aisi 420 at different bonding time
publisher American Institute of Physics Inc.
publishDate 2015
url https://www.scopus.com/inward/record.uri?eid=2-s2.0-85063846640&doi=10.1063%2f1.4919173&partnerID=40&md5=160c1680db50663785f2615b17c16b6a
http://eprints.utp.edu.my/31440/
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score 13.209306