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The influence of heat treatment on the high-stress abrasion resistance and fracture toughness of alloy white cast irons

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Abstract

The influence of a range of austenitizing and subcritical (tempering) heat treatments on the high-stress abrasion resistance and fracture toughness of four commercially significant grades of alloy white cast iron was investigated. Complementing an earlier study[1] on the influence of a more limited range of heat treatments on the gouging abrasion performance of the same alloys, the results showed that the effect of austenitizing temperature on high-stress abrasion pin test weight loss differed for each alloy. With increasing austenitizing temperature, these results ranged from a substantial improvement in wear performance and retention of hardness through to vir-tually no change in wear performance and substantial falls in hardness. Fracture toughness, however, increased markedly in all alloys with increasing austenitizing temperature. Tempering treatments in the range 400 °C to 600 °C, following hardening at the austenitizing temperature used commonly in industrial practice for each alloy, produced significant changes in both hard-ness and wear performance, but negligible changes in fracture toughness. Most importantly, the data showed that selection of the correct temperature for subcritical heat treatment to reduce the retained austenite content for applications involving repeated impact loading is critical if abrasion resistance is not to suffer.

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Authors and Affiliations

  1. CSIRO Division of Manufacturing Technology, 5011, Woodville, South Australia, Australia

    I. R. Sare (Assistant Chief) & B. K. Arnold (Experimental Scientist)

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  1. I. R. Sare
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  2. B. K. Arnold
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Sare, I.R., Arnold, B.K. The influence of heat treatment on the high-stress abrasion resistance and fracture toughness of alloy white cast irons. Metall Mater Trans A 26, 1785–1793 (1995). https://doi.org/10.1007/BF02670766

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  • DOI: https://doi.org/10.1007/BF02670766

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