Fe-25Cr-20Ni 合金层状碳化物 M_(23)C_(6) 的析出研究

Study of Lamellar Carbide M 23 C 6 Precipitation of Fe-25Cr-20Ni Alloy

研究了Ｆｅ－２５Ｃｒ－２０Ｎｉ合金中层状碳化物Ｍ２３Ｃ６的形态、晶体学特征、析出动力学及氮对层状Ｍ２３Ｃ６的析出作用．结果表明，层状Ｍ２３Ｃ６呈板条状，与基体奥氏体（Ａ）的位向关系是｛００１｝Ｍ２３Ｃ６∥｛００１｝Ａ’＜００１＞Ｍ２３Ｃ６∥＜００１＞Ａ．它的析出量受基体中碳的溶解度控制，氮能提＝高基体的溶解度。

The morphology of lamellar carbide M 23 C 6,crystallogical characteristics,the dynamics and the role of nigtrogen on the lamellar M 23 C 6 precipitation of Fe-25Cr-20Ni alloy are studied.The results show that the lamellar M 23 C 6 are lath carbides and the orientation relationship between the austenitic matrix and the lamellar M 23 C 6 are:{001} M 23 C 6 ∥{001} r,<001> M 23 C 6 =<001> r The amount of lamellar M 23 C 6 precipitation is determined by carbon content in austenitic matrix and nitrogen element will increase the solubility of austenitic matrix and forster lamellar M 23 C 6 to precipite.