Incorporation of TiC particles on AlSi 4340 low alloy steel surfaces via tungsten inert gas melting

Shahjahan Mridha, A.N. Idriss, Thomas Baker

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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 (1680J/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 grcater TiC addition and reduced energy input.
Original languageEnglish
Number of pages7
Publication statusPublished - 13 Jul 2011
Event14th international Conference on Advances in Materials and Processing Technologies - Istanbul, Turkey
Duration: 13 Jul 201116 Jul 2011


Conference14th international Conference on Advances in Materials and Processing Technologies


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

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