Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Modelling microstructural changes in pulsed weldments
Luleå tekniska universitet.
1994 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Microstructural changes in pulsed weldments have been studied in mild steel, a quenched and tempered steel and in two austenitic stainless steels. A heat flow model has been developed to compute the thermal cycles at different locations in the pulsed welds. It is shown that this model is useful in understanding the sequence of phase transformations in the pulsed welds. With additional information on the kinetics of phase transformations obtained by weld simulation, it is shown that a phenomenological modelling approach can be used for choosing appropriate procedures for applications where it is desired to obtain the maximum possible refinement of microstructures in the weld metal and heat affected zone. The effect of a refinement in the solidification structures in pulsed welds on the susceptibility to soldification cracking has been studied with the help of a slow-bend transvarestraint test method. This testing method is specially suited for studying the cracking tendency under dynamic conditions such as those prevailing in pulsed welds. First, with tests on constant current welds, it is shown that the susceptibility of a material to solidification cracking can be estimated in a sensitive manner. This data also provided the basis for evaluating the effects of pulsed welding on the cracking sensitivity. Work carried out on two austenitic stainless steels showed that pulsed welding leads to a refinement in the solidification structures. This was found to increase the cracking resistance only in the steel solidifying by the ferritic-austenitic mode. In case of the steel solidifying by the austenitic mode, an increase in the cracking sensitivity was observed for certain pulsing parameters. Metallographic evidence of Equation was observed in the pulsed welds of the latter steel. In the pulsed welding conditions studied, the adverse effect on the cracking resistance due to liquation seemed to override any positive effects that could result from grain refinement.

Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 1994. , 13 p.
Series
Doctoral thesis / Luleå University of Technologyy… → 31 dec 1996, ISSN 0348-8373 ; 150D
National Category
Other Materials Engineering
Research subject
Material Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-26431Local ID: e31b6dc0-f64a-11db-ac79-000ea68e967bOAI: oai:DiVA.org:ltu-26431DiVA: diva2:999593
Note
Godkänd; 1994; 20070429 (ysko)Available from: 2016-09-30 Created: 2016-09-30Bibliographically approved

Open Access in DiVA

fulltext(112248 kB)14 downloads
File information
File name FULLTEXT01.pdfFile size 112248 kBChecksum SHA-512
6457628bad52a14c939e1f5ce617c67e81680ee585ca99e77294d746cfd924c9eb4e0dea91d495a40fe0394d982e412d774d67935b95d0d61382523ec9f390ca
Type fulltextMimetype application/pdf

Other Materials Engineering

Search outside of DiVA

GoogleGoogle Scholar
Total: 14 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

urn-nbn

Altmetric score

urn-nbn
Total: 35 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf