Abstract
A type 304 austenitic stainless steel was heat-treated at temperatures of 800-1300 K, and the heat-treated specimens were observed by optical and transmission electron microscopy to examine the effect of crystallographic character of grain boundary on carbide precipitation and corrosion.At sensitizing temperatures, grain boundaries with carbide precipitation or corroded boundaries increased with holding time. Kikuchi line analyses showed that grain boundary carbide precipitation and corrosion sensitively depended on the grain boundary structure. A more ordered boundary needed longer time for carbide precipitation or corrosion than a less ordered boundary. This fact suggests that weld decay in austenitic stainless steel can be prevented by increasing the percentage of ordered boundaries in the material.
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