Experimental studies on process-induced morphological characteristics of macro- and microstructures in laser consolidated alloys

Download
  1. (PDF, 3 MB)
  2. Get@NRC: Experimental studies on process-induced morphological characteristics of macro- and microstructures in laser consolidated alloys (Opens in a new window)
DOIResolve DOI: http://doi.org/10.1007/s10853-011-5543-3
AuthorSearch for: ; Search for: ; Search for:
TypeArticle
Journal titleJournal of Materials Science
ISSN0022-2461
Volume46
Issue17
Pages58595875; # of pages: 17
SubjectLaser consolidation; Freeform fabrication; Rapid directional solidification; Microstructure; Residual stress; Nickel-base alloy; Stainless steel; Titanium alloy; Alluminum alloy
AbstractLaser consolidation (LC) developed by National Research Council's Industrial Materials Institute (NRC-IMI-London) since mid-1990s, is a laser cladding based rapid manufacturing and material additive process that could fabricate a "net-shape" functional metallic shape through a "layer-upon-layer" deposition directly from a computer aided design model without using molds or dies. In order to evaluate the LC processability of different materials, some representative nickel-based superalloys (IN-625, IN-718, IN-738, and Waspaloy), stainless steels (austenitic SS316L and martensitic SS420), and lightweight alloys (Ti-6Al-4V titanium alloy and Al-4047 aluminum alloy) have been investigated. Like other laser cladding based processes, due to process-induced rapid directional solidification, the LC alloys have demonstrated certain unique morphological characteristics. Moreover, the "as-consolidated" LC alloys, in nature, are in the "as-quenched" state, and some precipitation processes from their matrices, which are sometimes critical to the development of mechanical performance of the materials, could be effectively suppressed or retarded. Post-heat treatments, therefore, could necessarily facilitate the process of achieving their required operational microstructures. In this article, a comprehensive investigation was performed including metallurgical soundness and process-induced morphological characteristics of the LC materials, and microstructure development brought by post-LC heat treatments using optical microscope, scanning electron microscope, and X-ray diffraction. The implications on the mechanical performance of the LC materials were discussed as well in order to provide essential information for potential industrial applications of the LC materials. © 2011 Her Majesty the Queen.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); NRC Industrial Materials Institute (IMI-IMI)
Peer reviewedYes
NPARC number21271454
Export citationExport as RIS
Report a correctionReport a correction
Record identifiera87a7de1-4479-44fe-ad36-0d916d713b7f
Record created2014-03-24
Record modified2016-05-09
Bookmark and share
  • Share this page with Facebook (Opens in a new window)
  • Share this page with Twitter (Opens in a new window)
  • Share this page with Google+ (Opens in a new window)
  • Share this page with Delicious (Opens in a new window)