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    Volume 5, Issue 1 (February 2016)

    Heat Treatment of Precipitation-Hardening Stainless Steels Alloyed With Niobium

    (Received 21 August 2015; accepted 17 December 2015)

    Published Online: 26 February 2016

    CODEN: MPCACD

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    Abstract

    Precipitation-hardening stainless steels are iron-nickel-chromium alloys containing precipitation hardening elements such as aluminum, titanium, niobium, and copper. In this work, heat treatment of a novel precipitation hardening stainless steel using niobium as a forming element for the hardening precipitates was carried out in order to increase its hardness. The steel composition was 0.03C - 0.22Si - 17.86Cr - 3.91Ni - 2.19Mo - 1.96Nb (in wt.%). The samples were solution annealed at 1100°C for 2 h. Cooling was done in oil and the samples were subsequently aged at 500, 550, and 600°C. The solution annealed samples exhibited an average hardness of 30 Hardness Rockwell–Scale C and after the aging treatments, the hardness increased to 46 HRC. The hardness increases during the aging treatments were very fast. A 5 min treatment achieved hardness levels that were close to the maximum obtained for this alloy. Niobium was an efficient precipitation hardeners forming a Laves phase of the type Fe2Nb.


    Author Information:

    Mariani, F. E.
    Universidade de São Paulo, Escola de Engenharia de São Carlos, Departamento de Engenharia de Materiais, Sao Carlos, Sao Paulo

    Takeya, G. S.
    Universidade de São Paulo, Escola de Engenharia de São Carlos, Departamento de Engenharia de Materiais, Sao Carlos, Sao Paulo

    Casteletti, L. C.
    Universidade de São Paulo, Escola de Engenharia de São Carlos, Departamento de Engenharia de Materiais, Sao Carlos, Sao Paulo

    Neto, A. L.
    Universidade Tecnológica Federal do Paraná, Departamento de Engenharia de Materiais, Londrina, Parana

    Totten, G. E.
    Department of Materials, Portland State Univ., Portland, Oregon


    Stock #: MPC20150039

    ISSN:2165-3992

    DOI: 10.1520/MPC20150039

    Author
    Title Heat Treatment of Precipitation-Hardening Stainless Steels Alloyed With Niobium
    Symposium ,
    Committee A01