Laser cladding of TiC reinforced 316L stainless steel composites: Feedstock powder preparation and microstructural evaluation

ERTUĞRUL O., Enrici T. M., Paydas H., Saggionetto E., Boschini F., Mertens A.

POWDER TECHNOLOGY, vol.375, pp.384-396, 2020 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 375
  • Publication Date: 2020
  • Doi Number: 10.1016/j.powtec.2020.07.100
  • Journal Name: POWDER TECHNOLOGY
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, PASCAL, Aerospace Database, Agricultural & Environmental Science Database, Applied Science & Technology Source, Chemical Abstracts Core, Chimica, Communication Abstracts, Compendex, Computer & Applied Sciences, EMBASE, INSPEC, Metadex, Civil Engineering Abstracts
  • Page Numbers: pp.384-396
  • Keywords: Laser cladding, Microstructure, Titanium carbide, High-energy ball milling, Stainless steel composite, MECHANICAL-PROPERTIES, MATRIX NANOCOMPOSITES, POURING TEMPERATURE, ENERGY DEPOSITION, GRAIN-REFINEMENT, BEHAVIOR, EVOLUTION, CARBIDE, SOLIDIFICATION, SPEED
  • Dokuz Eylül University Affiliated: No

Abstract

Laser cladding was used to fabricate 316L/TiC composite coatings after optimizing the feedstock powder morphology. Firstly, the influences of ball-to-powder ratio (BPR) and milling duration on the morphology were investigated. The BPR of 1: 1 and 2 h of milling was sufficient to attach considerable amount of TiC particles onto 316L particles. Then, the microstructure and hardness behaviors of 15 vol% TiC reinforced 316L coatings were examined. Partial or total dissolution of the original TiC powders led to the formation of a reinforced austenitic microstructure with a hardness increase of 100 HV. This increase is due to a grain refinement effect of the TiC during solidification and the presence of new solidification carbides. Partially dissolved and primary MC globular carbides are well-distributed in the matrix together with few larger MC globular carbides. Furthermore, MC corallike pseudo-primary carbides and MC branched eutectic carbides are observed inside the cells and in intercellular spaces, respectively. (C) 2020 Elsevier B.V. All rights reserved.