Non-cube-on-cube orientation relationship between M23C6 and austenite in an austenitic stainless steel

摘要

Crystallographic orientation relationship between M23C6 carbides and austenite in the lightweight high carbon stainless steel Fe- 17Cr- 9Ni- 6Mn-4Al- 0.42C (wt.%) was investigated by diffraction analysis in scanning and transmission electron microscopes. Electron backscatter diffraction analysis in SEM indicated the existence of an orientation relationship approximated by the Kurdjumov-Sachs (K-S) orientation relationship between the M23C6 carbides induced by aging and the austenitic matrix. The observation of an orientation relationship deviating from the commonly reported cube-on-cube orientation relationship was explained by the formation of M23C6 carbides via M7C3 carbides as an intermediate phase.

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