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1. Define Creep The progressive deformation of a material at
constant stress at high temperature is
called creep.2. What is meant by diffusion process
2. What is meant by diffusion process Vacancies and
interstitialcies move through the crystal structure when
temperature is raised.
3. Why the rate of creep is more at elevated temperature?
raised.
3. Why the rate of creep is more at elevated temperature?3. Why
the rate of creep is more at elevated temperature? Creep is due to
diffusion and GB sliding and the rate of both are high at high
temperature.4. What is edge dislocation?
4. What is edge dislocation? Line defect along edge of the
crystal is called edge dislocation.
5. Write any two high creep resistance materials5. Write any two
high creep resistance materials Monel, Inconel, Hastelloy, DS
nickel, Incaloy, Haynes, Stellite, Nimonic, Udimet,
AISI 310S stainless steel, CCC, Alumina, SiC, Intermetallic
nickel aluminide6. What are the factors influencing creep?
6. What are the factors influencing creep?
Slip, sub grain formation, GB sliding, multiple slip, formation
of coarse slipbands, kin bands, GB migration kin bands, GB
migration
