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    Volume 49, Issue 4 (July 2021)

    Special Issue Paper

    Effect of Specimen Cross Section and Notch Radius on the Hydrogen Embrittlement Susceptibility of Tempered and Quenched AISI 4140 Steel

    (Received 18 April 2019; accepted 17 July 2019)

    Published Online: 2021

    CODEN: JTEVAB

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    Abstract

    To investigate the effects of the cross section and notch radius of specimens on the susceptibility to hydrogen embrittlement of AISI 4140 steel at different hardness levels, the incremental step loading technique was used. Initially, the effect of the three factors on the fast force fracture strength values was investigated. The study was based on a full factorial design, 2 × 2 × 3, in which the cross section and notch radius factors were investigated on 2 levels and hardness on 3 levels. Tests were performed using two equipment setup configurations. In the first test, a 1-kN load cell was used for standard test specimens with nominal dimensions of 10 × 10 × 60 mm3, and in the second, a load cell of 20 kN was used for nonstandard test specimens with nominal dimensions of 30 × 30 × 200 mm3. The analysis of variance showed that the cross section factor caused statistically significant effects on the SFFS values (the stress related to PFFS), and the hardness and the interaction between the hardness and cross section had statistically significant effects on the hydrogen embrittlement of AISI 4140 steel. When analysis of variance was performed separately for each cross section, it was observed that for specimens with cross sections of 10 × 10 mm2, the notch radius and the hardness factors caused statistically significant effects on the PFFS value, whereas for specimens with 30 × 30 mm2 cross sections, none of the investigated factors had statistically significant effects because of the larger constraint effect at the notch tip. The incremental step loading technique needs fewer specimens to complete the PTH evaluation when applied using larger strain constraint (larger cross section, smaller notch root, and higher hardness).

    Author Information:

    Júnior, Marcus Vinícius Rezende
    Department of Mechanical Engineering, Federal University of Uberlândia, Uberlândia, MG

    Paes, Marcelo Torres Piza
    Research and Development Center, CENPES/PETROBRÁS, Rio de Janeiro, RJ

    Filho, Waldek Wladimir Bose
    Escola de Engenharia de São Carlos – USP, Parque Arnold Schimidt, São Carlos, SP

    Arencibia, Rosenda Valdés
    Department of Mechanical Engineering, Federal University of Uberlândia, Uberlândia, MG

    Franco, Sinésio Domingues
    Department of Mechanical Engineering, Federal University of Uberlândia, Uberlândia, MG


    Stock #: JTE20190330

    ISSN:0090-3973

    DOI: 10.1520/JTE20190330

    Author
    Title Effect of Specimen Cross Section and Notch Radius on the Hydrogen Embrittlement Susceptibility of Tempered and Quenched AISI 4140 Steel
    Symposium ,
    Committee A01