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Effect of PWHT on the Microstructure and Mechanical proerties of ERNiCrFe-7 All-Weld Metal
Dept of Solid Mechanics, KTH Royal Institute of Technology, Stockholm.
Sandvik Materials Technology, Sandviken.
Sandvik Materials Technology, Sandviken.
Linköping University, Department of Management and Engineering, Engineering Materials. Linköping University, Faculty of Science & Engineering.
2015 (English)In: Welding in the World, ISSN 0043-2288, E-ISSN 1878-6669, Vol. 59, no 3, 317-323 p.Article in journal (Refereed) Published
Abstract [en]

The effects on the microstructure and room temperature mechanical properties of the nickel-based filler metal ERNiCrFe-7 due to a post weld heat treatment (PWHT) at 610 °C have been studied. It was shown that PWHT caused an increase in yield strength and ultimate tensile strength, but at the cost of reduced ductility and impact toughness. Crack tip opening displacement (CTOD) fracture toughness tests revealed an initial increase in maximum CTOD when a short PWHT was given, but declined with prolonged PWHT. The PWHT also caused a transition in fracture mechanism from microvoid coalescence to quasi-cleavage in room temperature air. Chromium-rich M23C6 type grain boundary carbides were present already in the as-welded weld metal, and were observed to coarsen during the PWHT. Intragranular M23C6 carbides were not observed in the as-welded state, but were precipitated during the 610 °C PWHT. Precipitation of these intragranular carbides is believed to be the main reason for the changes in mechanical properties.

Place, publisher, year, edition, pages
Springer, 2015. Vol. 59, no 3, 317-323 p.
Keyword [en]
nickel, heat treatment, toughness, strength
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:liu:diva-123641DOI: 10.1007/s40194-014-0201-4OAI: oai:DiVA.org:liu-123641DiVA: diva2:890623
Available from: 2016-01-04 Created: 2016-01-04 Last updated: 2016-01-13

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Chai, Guocai
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Engineering MaterialsFaculty of Science & Engineering
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