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Investigation of laser metal deposited Alloy 718 onto an EN 1.4401 stainless steel substrate
University West, Department of Engineering Science, Division of Welding Technology.ORCID iD: 0000-0002-1472-5489
University West, Department of Engineering Science, Division of Welding Technology.ORCID iD: 0000-0001-9065-0741
University West, Department of Engineering Science, Division of Welding Technology.ORCID iD: 0000-0003-2560-0531
2017 (English)In: Optics and Laser Technology, ISSN 0030-3992, E-ISSN 1879-2545, Vol. 97, no Supplement C, 144-153 p.Article in journal (Refereed) Published
Abstract [en]

This paper focuses on how process parameters affect the deposition of Alloy 718 onto an EN 1.4401 stainless steel substrate in terms of secondary phase formation, dilution and hardness. A columnar solidification structure with elongated grains growing in the direction normal to the substrate was observed for all parameters. In the interdendritic regions, phases with a high content of Niobium were identified. Scanning Electron Microscopy imaging and Energy Dispersive Spectroscopy measurements revealed these phases to most likely be Laves phase and Nb-carbides. Temperature measurements indicated no significant aging in the deposits. Considerable enrichment of iron was found in the initially deposited layers due to dilution from the substrate. The increased content of iron seemed to aid in forming constituents rich in niobium which, in turn, influenced the hardness. The highest mean hardness was noted in the sample with the lowest area fraction of Nb-rich constituents.

Place, publisher, year, edition, pages
2017. Vol. 97, no Supplement C, 144-153 p.
Keyword [en]
Laser metal deposition, Additive manufacturing, Powder, Superalloy, Stainless steel
National Category
Manufacturing, Surface and Joining Technology
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
URN: urn:nbn:se:hv:diva-11578DOI: 10.1016/j.optlastec.2017.05.038ISI: 000409284800019Scopus ID: 2-s2.0-85021979985OAI: oai:DiVA.org:hv-11578DiVA: diva2:1142652
Available from: 2017-09-19 Created: 2017-09-19 Last updated: 2017-10-10Bibliographically approved

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Segerstark, AndreasAndersson, JoelSvensson, Lars-Erik
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CiteExportLink to record
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Citation style
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