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Creep stress transfers matrix-particle in conjunction and disjunction particle matrix are examined. The effect of angles creep stress, dislocation glide, and stress transfer particle face on dislocation glide, and climb components of creep stress are calculated. The glide force and gliding velocity in particles disjunction matrix are deduced.

The difference of the experimental and the calculated creep rates of the steel grade X20CrMoV121 with M 23 C 6 particles in temperature range 763-913 K was examined in terms of temperature, iron self-diffusion rate, glide stress, and number of ferrite lattice vacancies. The Ashby-Hornbogen creep equation is modified by adding a parameter that represents the effect of number of lattice vacancies; consequently, the difference of the experimental and the calculated creep rates is diminish to the level of average particles size assessment accuracy.

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