Abstract
In austenitic stainless steels creep cavities nucleate at grain bourdaries by long time use at high temperatures. These creep cavities grow along grain bounrdaries, form grain boundary cracks by linking up each other, and cause premature and low ductility fracture. Therefore long time creep rupture life and ductilites chiefly depend upon the behavior of nucleation and growth of creep cavities. If the growth of creep cavities could be suppressed, creep rupture life and ductilites should be improved remarkably. Present work is intended to propose a self-healing process for the cavitation by utilization of thin filmy precipitation at creep cavity surface and improve the creep rupture properties by the self-healing process.
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