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Influence of low energy laser welding on solidification and microstructure of austenitic stainless steel welds
University West, Department of Engineering Science, Division of Manufacturing Processes. (Welding technology, PTW)ORCID iD: 0000-0003-3374-6282
University West, Department of Engineering Science, Division of Manufacturing Processes. (PTW)ORCID iD: 0000-0001-8822-2705
Pennsylvania State University.
2013 (English)In: The 14th Nordic Laser Materials Processing Conference: NOLAMP 14 / [ed] Alexander Kaplan, Hans Engström, Luleå: Luleå University of Technology , 2013, 3-14 p.Conference paper, Published paper (Refereed)
Abstract [en]

Primary austenitic solidification is related to increased hot cracking susceptibility in welding of austenitic stainless steels. It is also recognised that high cooling rates and rapid solidification conditions, like those achieved in laser beam welding (LBW), increase the stability of austenite versus ferrite as the primary solidification phase. Knowledge about the solidification mode under LBW conditions is therefore of utmost importance. A series of austenitic stainless steel alloys were prepared using an electric arc furnace and cooled at a rate of 10 ºC/s. The overall alloying composition was kept constant at [Cr eq+Nieq] = 40 wt% while changing the Cr eq/Nieq ratio from 1.52 to 1.84. These alloys were then laser welded using a continuous wave ytterbium fibre laser at two different energy input levels. Cooling rates were experimentally determined to be in the range of 10 3 ºC/s to 104 ºC/s and the values were confirmed by computational modelling. The compositional border between primary austenitic and primary ferritic solidification was found to shift to higher Cr eq/Nieq values at higher cooling rates. However, all the alloys showed coexistence of regions of primary austenitic and primary ferritic solidification for both laser settings although ustenite tended to more abundant at higher cooling rates. Austenite content and refinement of microstructure is discussed in terms of effects of cooling rate on solidification behaviour and solid state transformations.

Place, publisher, year, edition, pages
Luleå: Luleå University of Technology , 2013. 3-14 p.
Keyword [en]
Laser welding, Solidification, Microstructure, Austenitic stainless steel, weld, Work-integrated Learning, WIL
Keyword [sv]
AIL
National Category
Metallurgy and Metallic Materials
Research subject
ENGINEERING, Manufacturing and materials engineering; Work Integrated Learning
Identifiers
URN: urn:nbn:se:hv:diva-5691ISBN: 978-91-7439-688-1 (print)ISBN: 978-91-7439-689-8 (print)OAI: oai:DiVA.org:hv-5691DiVA: diva2:661884
Conference
The 14th Nordic Laser Materials Processing Conference, NOLAMP 14
Available from: 2013-11-05 Created: 2013-11-05 Last updated: 2016-02-10Bibliographically approved

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http://pure.ltu.se/portal/files/43698678/NOLAMP_14_2013_webb.pdf

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