Surface alloy depletion and martensite formation during glass to metal joining of austenitic stainless steels

摘要: AbstractPreoxidised and glass to metal (GtM) sealed austenitic stainless steels displayed a ferritic (bcc) layer near the metal/oxide interface, as determined by electron backscatter diffraction X-ray diffraction. Through probe microanalysis, it was that this depleted of alloying elements due oxidation sealing processes. Characterisation morphology suggested formed through martensite transformation mechanism. Thermochemical modelling with ThermoCalc also supported martensitic opposed diffusional ferrite formation. The composition gradient correlated Eichelman Hull empirical relationship for start (Ms) temperatures. Because Cr, Mn Si depletion during preoxidation sealing, Ms temperatures ambient are possible in surface region. non-uniform, however, laths extending deeper into alloy stabilised growth th...