SOLUTE ELEMENT PARTITIONING AND AUSTENITE STABILIZATION IN STEELS

摘要: Considerable amounts of thin film retained austenite have been found in low to medium carbon lath martensitic structural steels. The existence this metastable phase at room temperature has attributed several mechanisms which involve diffusion and redistribution during the martensite transformation. In investigation electron microscopy (TEM), convergent beam diffraction (CBED) field ion-atom probe (FIAP) analysis methods utilized measure C other solute element distributions austenite, ..gamma.., laths, ..cap alpha..'. partioning ..gamma.. alpha..'/..gamma.. interfaces occurs cooling, but there was no detectable change substitutional alloying elements (Cr, Mn, Ni, Si) between alpha..' ..gamma... Thus while plays a vital role stabilization, it cannot account completely for phenomenon. It is concluded that mechanical stabilization size effect are also major factors.