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Influence of heat treatments on toughness and sensitization of a Ti-alloyed supermartensitic stainless steel

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Abstract

Supermartensitic steels are a new class of martensitic stainless steels developed to obtain higher corrosion resistance and better toughness through the reduction of carbon content, and addition of Ni and Mo. They were developed to more critical applications or to improve the performance obtained with conventional grades AISI 410, 420, and 431. In this study, the influences of the tempering parameters on the microstructure, mechanical properties (hardness and toughness), and sensitization of a Ti-alloyed supermartensitc stainless steel were investigated. The material showed temper embrittlement in the 400–600 °C range, as detected by low temperature (−46 °C) impact tests. The degree of sensitization measured by double loop reactivation potentiodynamic tests increased continuously with the increase of tempering temperature above 400 °C. Healing due to Cr diffusion at high tempering temperatures was not observed. Double tempered specimens showed high amounts (>20%) of reverse austenite but their toughness were similar to specimens single tempered at 625 and 650 °C.

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Acknowledgement

The authors acknowledge the Brazilian research agencies (CAPES, FAPERJ and CNPq) for financial support.

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Authors and Affiliations

  1. PETROBRAS-UO-Rio, Rua General Canabarro, 500, Rio de Janeiro, CEP 20271-205, Brazil

    G. F. da Silva

  2. Departamento de Engenharia Mecânica, Universidade Federal Fluminense, Rua Passo da Pátria, 156, Niterói, CEP 24210-240, Brazil

    S. S. M. Tavares & J. M. Pardal

  3. Instituto de Ciências, Universidade Federal de Itajubá, Minas Gerais, Brazil

    M. R. Silva

  4. Departamento de Engenharia Metalúrgica e Materiais, Universidade Federal do Ceará, Campus do Pici, Bloco 702, Fortaleza, CEP 60455-760, Brazil

    H. F. G. de Abreu

Authors
  1. G. F. da Silva
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  2. S. S. M. Tavares
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  3. J. M. Pardal
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  4. M. R. Silva
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  5. H. F. G. de Abreu
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Correspondence to S. S. M. Tavares.

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da Silva, G.F., Tavares, S.S.M., Pardal, J.M. et al. Influence of heat treatments on toughness and sensitization of a Ti-alloyed supermartensitic stainless steel. J Mater Sci 46, 7737–7744 (2011). https://doi.org/10.1007/s10853-011-5753-8

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  • DOI: https://doi.org/10.1007/s10853-011-5753-8

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