University of Oulu

Laitila, J. & Larkiola, J. Weld World (2019) 63: 637. https://doi.org/10.1007/s40194-018-00689-7

Effect of enhanced cooling on mechanical properties of a multipass welded martensitic steel

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Author: Laitila , Juhani1; Larkiola, Jari1
Organizations: 1Materials and Production Engineering, Faculty of Technology, University of Oulu, Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 2.4 MB)
Persistent link: http://urn.fi/urn:nbn:fi-fe2019061320346
Language: English
Published: Springer Nature, 2019
Publish Date: 2019-06-13
Description:

Abstract

The effect of forced cooling using heat sinks on the mechanical properties and interpass waiting time of two-pass welds has been studied for a martensitic steel with a yield strength of 960 MPa when the interpass temperature was 100 °C. Cross-weld tensile and − 40 °C Charpy-V impact toughness properties were examined. The use of heat sinks is shown to result in a beneficial increase of the cross-weld yield strength but at the expense of the yield-to-tensile strength ratio. Due to its particularly detrimental effect on the heat-affected zone (HAZ) toughness of multipass welds, special attention was given in the Charpy-V toughness of the intercritically reheated coarse-grained HAZ (ICCGHAZ) by also testing simulated ICCGHAZs. It is shown that forced cooling has a beneficial effect in respect of the toughness of this simulated subzone and on the Charpy-V toughness of the HAZ of the actual welds. The interpass cooling time during the two-pass welding was reduced by 37%. The results indicate that, in the case of high-strength steels, it may be possible to simultaneously improve both welding productivity and mechanical properties by using forced cooling down to 100 °C to reduce waiting time between weld passes.

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Series: Welding in the world
ISSN: 0043-2288
ISSN-E: 1878-6669
ISSN-L: 0043-2288
Volume: 63
Issue: 3
Pages: 637 - 646
DOI: 10.1007/s40194-018-00689-7
OADOI: https://oadoi.org/10.1007/s40194-018-00689-7
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
Subjects:
Funding: Open access funding provided by University of Oulu including Oulu University Hospital. The authors are grateful for the financial support of the Business Finland and to Juha Uusitalo for conducting the Gleeble simulations used in this study.
Copyright information: © The Author(s) 2019. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
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