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    Volume 5, Issue 1 (July 2016)

    Enhanced Hardenability and Tempering Resistance of AISI 4130 Steel by Ni Addition

    (Received 16 September 2015; accepted 12 April 2016)

    Published Online: 05 July 2016

    CODEN: MPCACD

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    Abstract

    The AISI 4130 steel grade is commonly used in piping systems, where optimum chemical composition and heat treatment can exhibit high yield strength, good ductility, and moderate weldability depending on composition. However, this steel grade is characterized by its low hardenability, which limits a good transformation during quenching in heavy sections. In order to improve hardenability, Ni was added and C was reduced for the same level of CE (0.7). Two chemical compositions were used; samples were quenched at critical cooling rate and tempered. With the addition up to 0.5 wt. % Ni, the alloy exhibited great improvement on strength and toughness; additionally, the alloy allowed an increase of 40°C on the tempering temperature for the same strength level. In the case of post-welding, heat treatment is required so that the alloy is less susceptible to suffering a drop in mechanical properties. Results of chemical composition, strength, and toughness are discussed.


    Author Information:

    Martínez-Cazares, G. M.
    Universidad de Monterrey, San Pedro Garza García, Nuevo León

    Almanza, A.
    Instituto Tecnológico de Saltillo, Saltillo, Coahuila

    Almanza, E.
    Instituto Tecnológico de Saltillo, Saltillo, Coahuila

    Lozano, D. E.
    Universidad de Monterrey, San Pedro Garza García, Nuevo León

    Martínez-Cazares, G. M.
    Universidad de Monterrey, San Pedro Garza García, Nuevo León


    Stock #: MPC20150046

    ISSN:2165-3992

    DOI: 10.1520/MPC20150046

    Author
    Title Enhanced Hardenability and Tempering Resistance of AISI 4130 Steel by Ni Addition
    Symposium ,
    Committee A01