Weibull Statistical Properties for Rockwell Hardness of Incoloy 825 at Different Heat Treatment Temperatures

Abstract

This study was carried out to investigate the microstructure and Rockwell hardness of heat treated 90% hot forged Incoloy 825 alloy. With increasing solution treatment temperature, grain size increased and precipitates decreased, and precipitates not observed at 1,273K. With increasing aging time at 973K, precipitate increased and precipitates size increased. Shape parameter of solution treated material increased with increasing temperature, but decreased sharply at 1,273K. Scale parameter also decreased. Shape parameters and scale parameters of the aging treatment material increased, according to increasing of aging time.