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Alternative welding methods for nitrogen alloyed steel
Örebro University, School of Science and Technology.
2017 (English)Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesisAlternative title
Alternativa svetsmetoder för kvävelegerat stål (Swedish)
Abstract [en]

This project explores the feasibility of the solid-state welding method direct-drive friction welding to be used as a joining method for the nitrogen alloyed steel Uddeholm Vanax SuperClean, produced via processes based on powder metallurgy. Vanax SuperClean cannot be welded using fusion welding methods where the base material melts, due to nitrogen escaping the material, resulting in inferior quality welds. The cost of the material motivates the use of Vanax SuperClean for critical parts in applications, combined with a less costly material for the remaining parts, causing alternative joining methods to be examined.

Vanax SuperClean is friction welded to itself and to Uddeholm steel types Stavax ESR and UHB 11. Samples are prepared for a number of examinations. Microstructures of the samples are examined using microscopy, microhardness testing is carried out per the Vickers principle, retained austenite is measured using X-ray diffraction and tensile testing of the welded samples is performed. Defect-free welds are produced in all examined samples, showing that the method is suitable for Vanax SuperClean and that no preheating or slow cooling of workpieces are necessary.

The possibility of using friction stir welding as a joining method for Vanax SuperClean is discussed.

Abstract [sv]

Detta projekt undersöker möjligheten att använda trycksvetsningsmetoden friktionssvetsning som sammanfogningsmetod för det kvävelegerade pulvermetallurgiskt framställda stålet Uddeholm Vanax SuperClean. Vanax SuperClean kan inte svetsas med smältsvetsmetoder där grundmaterialet smälter, på grund av kvävgasbildning som resulterar i undermåliga svetsfogar. Kostnaden för materialet motiverar användandet av Vanax SuperClean för kritiska delar i applikationer, kombinerat med ett mindre kostsamt material till övriga delar, vilket föranleder undersökning av alternativa sammanfogningsmetoder.

Vanax SuperClean friktionssvetsas mot sig själv, såväl som mot Uddeholmsstålen Stavax ESR och UHB 11. Prov tas fram för ett antal undersökningar. Mikrostruktur undersöks med mikroskopi, mikrohårdhetsprovning utförs enligt Vickersprincipen, restaustenitnivåer mäts med röntgendiffraktion och dragprovning utförs. Lyckade svetsfogar fås i alla undersökta prover, vilket visar att svetsmetoden är lämplig för Vanax SuperClean och att varken förvärmning eller långsamt svalnande av arbetsstycken krävs.

Möjligheten att använda friktionsomrörningssvetsning som sammanfogningsmetod för Vanax SuperClean diskuteras.

Place, publisher, year, edition, pages
2017. , 71 p.
Keyword [en]
Nitrogen alloyed tool steel, Uddeholm Vanax SuperClean, solid-state welding, direct-drive friction welding, friction stir welding, microstructure, Vickers microhardness testing, retained austenite measurement by X-ray diffraction
Keyword [sv]
Kvävelegerat verktygsstål, Uddeholm Vanax SuperClean, trycksvetsning, friktionssvetsning, friktionsomrörningssvetsning, mikrostruktur, Vickers mikrohårdhetsmätning, restaustenitmätning med röntgendiffraktion
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:oru:diva-62142OAI: oai:DiVA.org:oru-62142DiVA: diva2:1155003
Subject / course
Mechanical Engineering
Supervisors
Examiners
Available from: 2017-11-06 Created: 2017-11-06 Last updated: 2017-11-06Bibliographically approved

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Alternative welding methods for nitrogen alloyed(6237 kB)3 downloads
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