Incorporation of TiC on Alsi 4340 low alloy steel surfaces via tungsten inert gas arc melting

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Abstract

Surface cladding utilizes a high energy input to deposit a layer on substrate surfaces providing protection against wear and corrosion. In this work, TiC particulates were incorporated by melting single tracks in powder preplaced onto AISI 4340 low alloy steel surfaces using a Tungsten Inert Gas (TIG) torch with a range of processing conditions. The effects of energy input and powder content on the melt geometry, microstructure and hardness were investigated. The highest energy input (1680 J/mm) under the TIG torch produced deeper (1.0 mm) and wider melt pools, associated with increased dilution, compared to that processed at the lowest energy (1008J/mm). The melt microstructure contained partially melted TiC particulates associated with dendritic, cubic and globular type carbides precipitated upon solidification of TiC dissolved in the
melt; TiC accumulated more near to the melt-matrix interface and at the track edges. Addition of 0.4, 0.5 and 1.0 mg/mm2 TiC gave hardness values in the resolidified melt pools between 750 to over 1100Hv, against a base hardness of 300 Hv; hardness values are higher in tracks processed with a greater TiC addition and reduced energy input.
Original languageEnglish
Pages (from-to)655-660
JournalAdvanced Materials Research
Volume445
Early online date24 Jan 2012
DOIs
Publication statusPublished - Aug 2012
Event14th international Conference on Advances in Materials and Processing Technologies - Istanbul, Turkey
Duration: 13 Jul 201116 Jul 2011

Keywords

  • low alloy steel
  • TIG torch
  • TiC powder
  • surface layer
  • microstructure
  • melt depth
  • hardness

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