本文采用透射电子显微镜研究了Fe-21Ni-4Mn合金中等温马氏体的生长过程,着重探讨了生长过程中亚结构的发展和变化.结果表明,在马氏体生长的初期阶段,小的薄片状马氏体的亚结构完全是以(112)_b为孪晶面的孪晶,并且贯穿整个片内,相界面平直向前生长.稍后阶段,片的生长主要集中在一侧,此例相界面弯曲向前生长,出现非孪晶区域,内含大量位错,同时,片的孪晶弯曲.生长到后期,弯曲的相界面变为平直,邻近相同位向的小片相互联接在一起,形成一宏观惯习面为(252)_f的大马氏体片,而构成大片的小马氏体片的惯习面为(121)_f.
The substructural development of martensite plates at different stageof the transformation for an Fe-21Ni-4Mn alloy has been investigated by usingtransmission electron microscope. Twinning was found in small thin platelets atthe initial stage. Fine twins extend to the whole platelet. The dislocations and twinswere found in the thick platelets at a later stage. Bending of the twins was alsoobserved frequently at this stage. Finally, several platelets coalesce with each otherto forma macroscopic (252)_f martensite "plate". The original habit plane of theindividual platelet was measured to be close to (121)_f.
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| [13] | Pitsch W. Philos Mag, 1954 |
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