Abstract
A thermodynamic analysis of hydrogen-assisted intergranular brittle fracture of high-strength steels has been made. In this analysis the functional relationship between cohesive energy and hydrogen coverage is derived in the case of solute equilibrium constraint during the decohering process. This relationship is evaluated and discussed in the presence of a triaxial stress field. The variation of threshold-stress intensity, Kth, with hydrogen fugacity is calculated by a criterion for hydrogen-assisted intergranular fracture, and is also considered as it relates to the effects of several material parameters, such as trap-binding energy at a grain boundary, yield strength and work-hardening exponent. In particular the fracture mode transition by hydrogen-assisted cracking is discussed as it relates to the effects of hydrogen on the Kth necessary for the occurrence of the respective fracture modes.
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