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Effect of carbides on the austenite grain growth characteristics in 1Cr-1C and 6Cr-1Mo-1C steels

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Abstract

The nature of carbidesvis-a-vis austenite grain growth characteristics in a ball-bearing steel (1Cr-1C) and in a wear-resistant steel (6Cr-1Mo-1C) is reported. Quantitative EPMA analysis was used to determine the type of carbides andin situ examination of austenite grain growth was carried out in a hot-stage microscope. The grain size against temperature plots indicated an initial stage of slower “normal” grain growth, followed by the “abnormal” growth, or, grain coarsening beyond a critical soaking temperature. The M3C type of carbides containing a small amount of chromium could inhibit grain coarsening up to 1223 K in 1Cr-1C steel, whereas the alloy carbides of the M7C3 type with a substantial amount (about 35 mass%) of chromium were more effective in restricting grain growth even up to 1273 K in the 6Cr-1Mo-1C steel. In addition, the grain sizes obtained in the latter steel were found to be considerably smaller than those of the former variety at all soaking temperatures investigated.

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Authors and Affiliations

  1. Research and Development Centre for Iron and Steel, Steel Authority of India Limited, 834002, Ranchi, India

    Amitava Ray, Santanu Kr. Ray & S. R. Mediratta

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  1. Amitava Ray
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  2. Santanu Kr. Ray
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  3. S. R. Mediratta
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Ray, A., Kr. Ray, S. & Mediratta, S.R. Effect of carbides on the austenite grain growth characteristics in 1Cr-1C and 6Cr-1Mo-1C steels. J Mater Sci 25, 5070–5076 (1990). https://doi.org/10.1007/BF00580131

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  • DOI: https://doi.org/10.1007/BF00580131

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