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Effect of refining austenite grains on the properties of carbon steels after lowtemperature tempering

  • Structural Steels
  • Published:
Metal Science and Heat Treatment Aims and scope

Conclusions

  1. 1.

    Preparation of the initial structure, a high heating rate, and restricting the maximum temperature make it possible to obtain an austenite grain size of grade 15 in carbon steels with 0.4–0.8% C.

  2. 2.

    Refining of austenite grains from grade 8 to grade 15 increases the strength and reduces the critical embrittlement temperature in impact and static tests of these steels after low-temperature tempering.

  3. 3.

    After tempering of steel 45 at 200°C the strength is 230kg/mm2 for a grain size of grade 15 and 205 kg/mm2 for a grain size of grade 8, while the critical embrittlement temperature determined in impact tests is 200°C lower for the fine-grained steel than the coarse-grained steel.

  4. 4.

    In steels with a higher carbon content (0.55–0.8%) the lowering of the critical embrittlement temperature in fine-grained steel leads to the fact that these steels become ductile at lower tempering temperatures, making it possible to attain a strength of 280–290 kg/mm2.

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Literature cited

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Authors
  1. G. A. Ostrovskii
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  2. V. I. Sarrak
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  3. K. Z. Shepelyakovskii
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  4. R. I. Éntin
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Additional information

Moscow Automobile Plant. TsNIIChERME T. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 6, pp. 56–62, June, 1967.

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Ostrovskii, G.A., Sarrak, V.I., Shepelyakovskii, K.Z. et al. Effect of refining austenite grains on the properties of carbon steels after lowtemperature tempering. Met Sci Heat Treat 9, 458–462 (1967). https://doi.org/10.1007/BF00657596

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  • DOI: https://doi.org/10.1007/BF00657596

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