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采用马氏体漫散射的Ｆｏｕｒｉｅｒ分析方法并与显微组织分析相结合，确认Ｆｅ－ｌ．８３Ｃ％（质量）马氏体在时效时发生了调幅分解，其调幅结构由波长为１ｎｍ左右的主波和大于１ｎｍ的次波叠加而成．首次发现铁碳马氏体调幅分解存在一个显著的特点，即调幅结构即使在长达数月之后也未发生长大，其原因是贫富碳区之间的强烈弹性交互作用使得处于分解早期的调幅结构的长大陷于停止，最后，提出了一个重要的问题，即铁碳马氏体中存在的有序化和调幅分解共存的现象对经典的相变理论提出了重大挑战．经典相变理论无法解释有序化与调幅分解共在现象的原因，在于它建立在过于简单的原子最近邻作用假设之上。
The Fourier analysis of martensitic diffuse scattering was used in combination with the microstructure analysis to confirm Fe-1. The 83C% (mass) martensite undergoes amplitude modulation decomposition when aged, and the amplitude modulation structure is formed by superposition of the main wave with the wavelength of about 1 nm and the sub-wave with the wavelength larger than 1 nm. For the first time, it was found that there is a remarkable characteristic of the amplitude modulation decomposition of iron-carbon martensite that the amplitude modulation structure did not grow up even after several months because of the strong elastic interaction between the carbon rich and poor regions that made early decomposition Finally, an important issue is raised, namely, the coexistence of ordering and amplitude modulation decomposition existing in the iron-carbon martensite poses a major challenge to the classical theory of phase transition. Classical phase change theory can not explain the co-occurrence of ordering and amplitude modulation decomposition in the phenomenon, because it is based on the overly simple atomic nearest neighbor hypothesis.