Dear Mr. Alcantara, as it is obvious in the main creep equation, the strain rate in creep is inversely related to the grain size with the power of the parameter that named p and its value is changeable in every mechanisms. The mechanisms of creep were defined according to the applied stress and strain rate. In Harper-Dorn and Dislocation Creep mechanisms the value of p is 0. Because the creep behaviour is not related to the grain boundary but in GBS, Nabarro-Herring and Coble mechanisms the value of p change between 1-3 and grain boundary is important parameter in their creep behaviour.
Dear Mr. Alcantara, as it is obvious in the main creep equation, the strain rate in creep is inversely related to the grain size with the power of the parameter that named p and its value is changeable in every mechanisms. The mechanisms of creep were defined according to the applied stress and strain rate. In Harper-Dorn and Dislocation Creep mechanisms the value of p is 0. Because the creep behaviour is not related to the grain boundary but in GBS, Nabarro-Herring and Coble mechanisms the value of p change between 1-3 and grain boundary is important parameter in their creep behaviour.
Dear Maryan.
Thank you so much for your answer .... It is very clear your answer
Dear sir,
Higher the grain size, lower the creep, for example carbon steel A106 material exhibit more creep resistance compared to A333. Both materials have same chemical composition, but A106 is large grain size than A333.
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