F. Shi
,
L.J. Wang
,
W.F. Cui
,
C.M. Liu
金属学报(英文版)
The precipitation behavior of M2N and the microstructural evolution in a Cr-Mn austenitic stainless steel with a high
nitrogen content of 0.43mass% during isothermal aging has been investigated using optical microscopy (OM), scanning electron
microscopy (SEM), and transmission electron microscopy (TEM). The aging treatments have led to the decomposition of nitrogen
supersaturated austenitic matrix through discontinuous cellular precipitation. The precipitated cells comprise alternate lamellae
of M2N precipitate and austenitic matrix. This kind of precipitate morphology is similar to that of pearlite. However, owing to the
non-eutectoidic mechanism of the reaction, the growth characteristic of the cellular precipitates is different from that
of pearlite in Fe-C binary alloys. M2N precipitate in the cell possesses a hexagonal crystal structure with the parameters a =
0.4752nm and c = 0.4429nm, and the orientation relationship between the M2N precipitates and austenite determined from the SADP is [0110]M2N∥ [101]γ，［2110］M2N∥ ［010］γ.
关键词:
austenitic stainless steel
,
null
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