利用汇聚束电子衍射研究了Ｆｅ２０Ｎｉ５Ｍｎ 钢中同一板条马氏体束内相邻板条的位向关系，发现了同一板条马氏体束内相邻板条之间的孪晶取向关系，并根据切转晶体学理论解释了同一板条马氏体束内相邻板条之间的位向关系 The relationship between the adjacent laths in the martensite beam of the same lath in Fe20Ni5Mn steel was studied by using convergent beam electron diffraction. The twinning between adjacent laths in the same lath martensite beam was found Orientation relationship and the orientation relationship between adjacent slats in the same lath martensite beam