Laser-fabricated Fe-Ni-Co-Cr-B austenitic alloy on steels. Part I. Microstructures and cavitation erosion behaviour

C. T. Kwok, F. T. Cheng, Hau Chung Man

Research output: Journal article publicationJournal articleAcademic researchpeer-review

28 Citations (Scopus)

Abstract

Laser surface alloying using NiCoCrB alloy (Ni-17.1% Co-19.6% Cr-14.5% Fe-3.5% B-1% C-0.9% Si) on mild steel AISI 1050 and austenitic stainless steel AISI 316L was attempted. Both steels alloyed with NiCoCrB contained austenite as the main phase, with carbides and borides as the minor phases. The maximum hardness of laser-alloyed 1050 and 316L increased to 545 and 410 Hv, respectively, with the cobalt content ranging from 4.5 to 12 wt.%. The cavitation erosion resistance Rein deionized water was determined by an ultrasonic vibration system. Rewas found to increase with the Co content in the alloyed layer, reaching a value 4.4- and 12-fold that of the substrate for 1050 and 316L, respectively. The increase in Rewas attributed to a decrease in the stacking-fault energy and enhancement of strain-induced martensitic transformability due to the presence of Co. Increase in hardness due to the presence of carbides and borides and a refined microstructure resulting from laser treatment also contributed to an enhanced resistance.
Original languageEnglish
Pages (from-to)194-205
Number of pages12
JournalSurface and Coatings Technology
Volume145
Issue number1-3
DOIs
Publication statusPublished - 1 Aug 2001

Keywords

  • Cavitation erosion
  • Laser surface alloying
  • Martensitic transformability
  • Stacking-fault energy
  • Steels

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Condensed Matter Physics
  • Surfaces and Interfaces

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