Investigation of melting in the Al-Si coating of a boron steel sheet by differential scanning calorimetry

S. J. Grauer, E. J.F.R. Caron, N. L. Chester, M. A. Wells, K. J. Daun

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Abstract

This paper investigates the veracity of claims, reported in the literature, that slow heating of Al-Si coated boron steel blanks in a roller hearth furnace can allow sufficient diffusion of iron from the steel substrate to the coating and prevent liquefaction of the Al-Si layer. The results of differential scanning calorimetry experiments conducted at various heating rates indicate that melting cannot be avoided under realistic industrial heating conditions. Heating rates as low as 0.08 K/s as well as isothermal heat treatments at 550 °C for 60 min are insufficient to prevent melting of the binary Al-Si layer at the eutectic temperature. A two-stage treatment in which the coating was pre-treated up to 650 °C to form solid Al-Si-Fe intermetallics is investigated. Intermetallic formation at 650 °C is shown to occur very quickly due to the enhanced iron diffusion in the liquid Al-Si phase. The coating of pre-treated blanks does not melt during the second stage of the heat treatment; however the properties of the final component obtained via this two-stage heat treatment remain to be assessed.

Original languageEnglish (US)
Pages (from-to)89-94
Number of pages6
JournalJournal of Materials Processing Technology
Volume216
DOIs
StatePublished - Feb 2015

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Computer Science Applications
  • Metals and Alloys
  • Industrial and Manufacturing Engineering

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