eprintid: 5834 rev_number: 2 eprint_status: archive userid: 1 dir: disk0/00/00/58/34 datestamp: 2023-11-09 16:17:34 lastmod: 2023-11-09 16:17:34 status_changed: 2023-11-09 16:04:00 type: conference_item metadata_visibility: show creators_name: Ibrahim, N.N.M. creators_name: Hussain, P. creators_name: Awang, M. title: Morphology, topography, and hardness of diffusion bonded sialon to AISI 420 at different bonding time ispublished: pub note: cited By 0; Conference of 23rd Scientific Conference of Microscopy Society Malaysia, SCMSM 2014 ; Conference Date: 10 December 2014 Through 12 December 2014; Conference Code:113582 abstract: 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. date: 2015 publisher: American Institute of Physics Inc. official_url: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85063846640&doi=10.1063%2f1.4919173&partnerID=40&md5=160c1680db50663785f2615b17c16b6a id_number: 10.1063/1.4919173 full_text_status: none publication: AIP Conference Proceedings volume: 1669 refereed: TRUE isbn: 9780735413160 issn: 0094243X citation: 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.