Precipitation analysis of as-cast HK40 steel after isothermal aging

M. L. Saucedo-Mu&#241;oz; A. Ortiz-Mariscal; V. M. Lopez-Hirata; J. D. Villegas-Cardenas; Orlando Soriano-Vargas; Erika O. Avila-Davila

doi:10.1007/s12613-017-1503-5

Volume 24 Issue 10

Oct. 2017

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2017 > 24(10): 1125-1133

M. L. Saucedo-Muñoz, A. Ortiz-Mariscal, V. M. Lopez-Hirata, J. D. Villegas-Cardenas, Orlando Soriano-Vargas, and Erika O. Avila-Davila, Precipitation analysis of as-cast HK40 steel after isothermal aging, Int. J. Miner. Metall. Mater., 24(2017), No. 10, pp. 1125-1133. https://doi.org/10.1007/s12613-017-1503-5

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M. L. Saucedo-Muñoz, A. Ortiz-Mariscal, V. M. Lopez-Hirata, J. D. Villegas-Cardenas, Orlando Soriano-Vargas, and Erika O. Avila-Davila, Precipitation analysis of as-cast HK40 steel after isothermal aging, Int. J. Miner. Metall. Mater., 24(2017), No. 10, pp. 1125-1133. https://doi.org/10.1007/s12613-017-1503-5

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Research Article

Precipitation analysis of as-cast HK40 steel after isothermal aging

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Corresponding author:
V. M. Lopez-Hirata E-mail: vlopezhi@prodigy.net.mx
Received: 24 February 2017; Revised: 17 May 2017; Accepted: 19 May 2017

Abstract

Abstract

As-cast HK40 steel was aged at 700, 800, or 900℃ for times as long as 2000 h. Microstructural characterization showed that the primary M₇C₃ carbide network contained a substantial content of manganese, in agreement with the microsegregation of manganese calculated by Thermo-Calc using the Scheil-Gulliver module. The dissolution of primary carbides caused the solute supersaturation of austenite and subsequent precipitation of fine M₂₃C₆ carbides in the austenite matrix for aged specimens. During prolonged aging, the carbide size increased with increasing time because of the coarsening process. A time-temperature-precipitation diagram for M₂₃C₆ carbides was calculated using the Thermo-Calc PRISMA software; this diagram showed good agreement with the experimental growth kinetics of precipitation. The fine carbide precipitation caused an increase in hardness; however, the coarsening process of carbides promoted a decrease in hardness. Nanoindentation tests of the austenite matrix indicated an increase in ductility with increasing aging time.
- as-cast HK40 steel;
- carbide precipitation;
- aging;
- precipitation simulation

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References

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