51316-7440-Influence Of Baking Time At Different Temperature On The Hydrogen Embrittlement Of Quenched And Tempered Martensitic (Qtm) Steel

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Product Number: 51316-7440-SG

ISBN: 7440 2016 CP

Author: Juan CREUS

Publication Date: 2016

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The objective of this presentation is to highlight the influence of the baking conditions (temperature and duration) on the mechanical properties of a quenched and tempered martensitic (QTM) steel [1].Electrochemical charging in an acidic solution was performed at fixed current density up to the hydrogen saturation concentration into the specimen. A thorough characterization of the metallurgical state was performed using a multiscaleanalyses

approach. Hydrogen diffusion and trapping was then analyzed using electrochemical permeation technique [2-4].Thermal desorption spectroscopy (TDS) was used to evaluate the concentration of trapped hydrogen after the desorption conditions [56]. It was observed that a redistribution of hydrogen occurs during the baking process leading to the increase of the concentration of irreversibly trapped hydrogen.Tensile specimens were used to evaluate the influence of this redistribution of the mechanical properties. Interesting results were obtained suggesting that an embrittlement could be observed during the desorption process. A correlation will be drawn between the maximum of the embrittlement and the one of the kinetic of hydrogen outgassing.Observations of the fracture after different duration give interesting features on the impact of hydrogen.[1] A. Oudriss A. Fleurentin G. Courlit E. Conforto C. Berziou C. Rébéré S. Cohendoz J.M. Sobrino J. Creus X. Feaugas. Mater. Sci. Eng. A 598 (2014) 420.[2] S. Frappart X. Feaugas J. Creus F. Thebault L. Delattre H. Marchebois. J. Phys. Chem Solids 71 (2010) 1467.[3] R.A. Oriani. Acta Metall. 18 (1970) 147.[4] T. Zakroczymsk420.i E. Owczarek. Acta. Mater. 50 (2002) 2701.[5] S. Frappart A. Oudriss X. Feaugas J. Creus J. Bouhattate F. Thébault L. Delattre H. Marchebois. Scr. Mater. 65 (2011) 859.[6] S. Frappart X. Feaugas J. Creus F. Thébault L. Delattre H. Marchebois. Mater. Sci. Eng. A534 (2012) 384.