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Effect of Silicon on Carbide Precipitation after Tempering of H11 Hot Work Steels

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Abstract

The formation of secondary carbides during tempering of H11 hot work steels at 898 K (625 °C) was studied by transmission electron microscopy (TEM) and related to the previously established effects of Si content on mechanical properties. Lower Si contents (0.05 and 0.3 pct Si) and higher Si contents (1.0 and 2.0 pct Si) were observed to yield different carbide phases and different particle distributions. Cementite particles stabilized by Cr, Mo, and V in the lower Si steels were found to be responsible for similar precipitation hardening effects in comparison to the M2C alloy carbides in the higher Si steels. The much higher toughness of the lower Si steels was suggested to be due to a finer and more homogeneous distribution of Cr-rich M7C3 carbides in the interlath and interpackage regions of the quenched and tempered martensite microstructure. The present effects of Si content on the formation of alloy carbides in H11 hot work steels were found to be the result of the retarding effect of Si on the initial formation of cementite, well known from the early tempering stages in low alloy steels.

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Acknowledgments

Financial support by the Brazilian research funding agencies FAPESP and CNPq is gratefully acknowledged. H.-J. Kestenbach and R.A. Mesquita also thank CNPq for their research scholarships.

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Authors and Affiliations

  1. Universidade Nove de Julho, Av. Francisco Matarazzo 612, São Paulo, SP, 05001-100, Brazil

    R. A. Mesquita (Professor)

  2. Villares Metals, Rua Alfredo Dumont Villares 155, Sumaré, SP, 13178-902, Brazil

    C. A. Barbosa (Head of Research)

  3. Physics Department, Universidad Central de las Villas, Carretera a Camajuaní, Km. 5½, Santa Clara, Cuba

    E. V. Morales (Professor)

  4. Department of Materials Engineering, Universidade Federal de São Carlos, Rod., Washington Luis, km 235, CP 676, São Carlos, SP, 13565-905, Brazil

    H.-J. Kestenbach (Professor)

Authors
  1. R. A. Mesquita
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  2. C. A. Barbosa
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  3. E. V. Morales
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  4. H.-J. Kestenbach
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Correspondence to R. A. Mesquita.

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Manuscript submitted November 22, 2009.

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Mesquita, R.A., Barbosa, C.A., Morales, E.V. et al. Effect of Silicon on Carbide Precipitation after Tempering of H11 Hot Work Steels. Metall Mater Trans A 42, 461–472 (2011). https://doi.org/10.1007/s11661-010-0430-0

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