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dc.contributor.author | Smith, D.![]() |
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dc.contributor.upauthor | Du Toit, Madeleine | |
dc.contributor.upauthor | Van Rooyen, Gerrit T. | |
dc.date.accessioned | 2008-07-01T12:06:59Z | |
dc.date.available | 2008-07-01T12:06:59Z | |
dc.date.issued | 2008-05-28 | |
dc.description | Professor Madeleine du Toit of the University of Pretoria has won the Harvey Shacklock Gold Medal. Prof du Toit works in the Department of Materials Science and Metallurgical Engineering. The decision to declare her a winner was made at a recent meeting of the council of the Southern African Institute of Welding (SAIW). This award is made to the author of an outstanding paper presented to a SAIW conference or technical meeting. The award was first presented as long ago as 1949 and is donated by Afrox in recognition of Harvey Shacklock – the former managing director of Afrox and the first President of SAIW in 1948. Du Toit presented this paper to the SAIW meeting held in Johannesburg. Her paper was titled: ‘Failure of type 1.4003 welds due to intergranular stress corrosion cracking and pitting corrosion in the HAZ’. “I know the award is well earned in this our 60th anniversary year– many congratulations,” said Jim Guild, Executive Director of SAIW. Du Toit said that she feels very honoured to be the recipient of the Harvey Shacklock Gold Medal in the 60th anniversary year of the Southern African Institute of Welding (SAIW). “Over the last 60 years, the Southern African Institute of Welding has grown into South Africa's leading provider of internationally accredited training and certification programmes in the field of welding. It is a privilege to be recognised by the Institute on occasion of such a milestone,” she said. Du Toit will receive her award at the annual dinner to be held at the Balalaika Hotel on the 25th July 2008. | en |
dc.description.abstract | This document presents an overview of the findings of several investigations into the susceptibility of 12% chromium type 1.4003 ferritic stainless steel to heat-affected zone sensitization and intergranular stress corrosion cracking. A description of the sensitization behaviour of these steels is complicated by the partial transformation of d-ferrite to austenite on cooling. During slow cooling or annealing below the A1 temperature, this austenite decomposes to form desensitized ferrite and M23C6-type carbide precipitates. The rapid cooling rates associated with welding, however, prevent the transformation of austenite to ferrite at lower temperatures, and any austenite formed on cooling transforms to martensite below the Ms-temperature. Four distinct modes of heat-affected zone sensitization have been identified to date. Sensitization of the martensite phase may occur on welding material inadvertently annealed above the A1 temperature (Mode 1), or when multiple welds are positioned in such a way that the heat-affected zone of the 2nd pass overlaps the heataffected zone of the 1st pass (Mode 2). Rapid cooling after very low heat input welding may sensitize the ferrite phase (Mode 3), whereas very slow cooling after welding at excessively high heat input levels may lead to sensitization of the austenite phase (Mode 4). Results examining the influence of Modes 1 and 2 heat-affected zone sensitization on the incidence of intergranular stress corrosion cracking are presented. | en |
dc.description.uri | http://www.saiw.co.za/ | en |
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dc.format.mimetype | application/pdf | |
dc.identifier.citation | Du Toit, M, Van Rooyen, GT & Smith, D 2008, 'An overview of the heat-affected zone sensitization and stress corrosion cracking behaviour of 12% chromium type 1.4003 ferritic stainless steel', Paper presented to the Southern African Institute of Welding 60th Anniversary Conference, Gold Reef City South Africa, 28 - 29 May 2008. 16 p. | en |
dc.identifier.uri | http://hdl.handle.net/2263/6020 | |
dc.language.iso | en | en |
dc.publisher | South African Institute of Welding | en |
dc.rights | Madeleine du Toit | en |
dc.subject | Heat-affected zone sensitization | en |
dc.subject | Stress corrosion | en |
dc.subject | Chromium type 1.4003 ferritic stainless steel | en |
dc.subject.lcsh | Stress corrosion | |
dc.subject.lcsh | Ferritic steel | |
dc.subject.lcsh | Austenite | |
dc.subject.lcsh | Ferrite | |
dc.subject.lcsh | Martensite | |
dc.subject.lcsh | Welding | |
dc.title | An overview of the heat-affected zone sensitization and stress corrosion cracking behaviour of 12% chromium type 1.4003 ferritic stainless steel | en |
dc.type | Presentation | en |