Abstract
A configurational, equilibrium theory for relative interfacial torques has been invoked to qualitatively explain growth-specific lamellar precipitation of M 23C 6 carbides in 304 stainless steel where the lamellar growth is always in the 〈112〉 directions coincident with traces of 111 planes at 90° to (110) grain surface orientations. For (112) grain surface orientations, M 23C 6 lamellar growth is always in the[11¯0] direction which is also coincident with traces of (111¯) planes at 90° to the grain surface plane. These 111 trace directions for lamellar growth are denoted T90 directions and are shown to coincide with high, relative interfacial torques (or torque configurations) resolved in coherent 111 annealing twin boundaries. For grain surface orientations containing annealing twins or twin/grain boundary geometries whose coherent 111boundaries are not coincident with T90 directions, such as (100), there are no high-torque configurations and no significant lamellar M 23C 6 growth coincident with 111 trace directions.
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