Application of the Monkman-Grant Relationship for Ultrafine-Grained Metallic Materials

Abstract:

The applicability of the Monkman-Grant relationship was analyzed and validated for ultrafine-grained metallic materials under investigation. A special attention has been given to the creep damage tolerance factor which is defined as the ratio of the strain to fracture to the Monkman-Grant ductility and which describes the coupling between creep deformation and damage based on continuum creep damage approach. It was found, that ultrafine-grained materials generally obey the Monkman-Grant relationship, however, the relationship is especially suitable for materials exhibiting short secondary creep and long tertiary creep stages when dislocation-controlled creep is dominant.

• Periodical: Key Engineering Materials (Volumes 577-578)
• Pages: 137-140
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.577-578.137
• Online since: September 2013
• Authors: Marie Kvapilová, Jiří Dvořák, Petr Král, Milan Svoboda, Václav Sklenička
• Keywords: Creep, Creep Life, Creep Rate, Monkman-Grant Relationship, Ultrafine-Grained Materials

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