Abstract
The influence of composition, heat-treatments, and microstructure of quenched and tempered Cr-Mo steels on their behavior under sulfide stress corrosion cracking is studied. Starting from a lCr-0.2Mo steel, with a UTS of 1015 MPa, laboratory heats of lCr-0.8Mo, lCr-0.2Mo-V, lCr-0.2Mo-V-Ti, and lCr-0.8Mo-V-Ti steels are prepared and tempered to UTS of 900 to 1000 MPa. SSC tests are conducted in NACE solutions and show the beneficial influence of isolated or combined Mo, V, and Ti additions. The microstructural characterizations and a fundamental study of hydrogen permeation and hydrogen trapping in the microstructure (through high resolution autoradiography and vacuum desorption measurements) give the explanation of the SSC behavior of the steels. The good performances of the lCr-0.8Mo-V-Ti steel are attributed to the precipitation of very finely dispersed particles with an MC carbide type structure, which act both by retarding the tempering process and playing a role of good traps for hydrogen.
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Formerly with Laboratoire de Metallurgie (Associé au CNRS, no. 177), Université Paris-Sud, 91405 Orsay, France
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Charbonnier, J.C., Margot-Marette, H., Brass, A.M. et al. Sulfide stress cracking of high strength modified Cr-Mo steels. Metall Trans A 16, 935–944 (1985). https://doi.org/10.1007/BF02814846
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DOI: https://doi.org/10.1007/BF02814846