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Grain boundary composition and associated hydrogen cracking of modified 4130 steels

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Abstract

Earlier work on AISI 4130 steels showed that phosphorus segregation to prior austenite grain boundaries was the primary cause for intergranular fracture of these steels when exposed to hydrogen. Reduction of P segregation to grain boundaries by removing the strong segregation couples of Mn-P and Si-P was expected to increase the hydrogen stress cracking resistance of 4130 type steels. Elimination of Mn and/or Si did reduce the concentration of P at prior austenite grain boundaries, but allowed segregation of S and N which acted in the same manner as P, promoting intergranular hydrogen stress cracking.

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  1. Metallurgical Consultants, Inc. of Denver, 80111, Denver, CO

    Bruce D. Craig (Senior Consultant)

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  1. Bruce D. Craig
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Craig, B.D. Grain boundary composition and associated hydrogen cracking of modified 4130 steels. Metall Trans A 15, 565–572 (1984). https://doi.org/10.1007/BF02644981

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  • DOI: https://doi.org/10.1007/BF02644981

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