Crystallography of lath martensite in steels
Crystallography of lath martensite in steels
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DOI：
10.2320/matertrans1989.33.235
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发表时间：
1992
期刊：
影响因子：
--
通讯作者：
P. Kelly
中科院分区：
文献类型：
--
作者：
P. Kelly
双晶格不变量剪切唯象理论已被用来解释板条马氏体的所有已知的晶体学特征。当晶格不变量剪切系统被视为马氏体中的有理滑移系统，滑移方向沿着[111]和[111]时，惯习平面解收敛到与（557）重合或接近的（hhl）hab平面。这些有理晶格不变剪切系统的多达35种不同的组合导致（hhl）惯态平面与（111）成9°至14°。该理论正确地预测了惯习面、取向关系（包括观察到的紧密堆积方向[110]和[111]之间的角度扩展）、形状应变、以α/[111]位错为主的致密位错的内部子结构以及奥氏体/马氏体界面中约3.5 nm处的α/[111]位错阵列的存在。板条马氏体的理论解释还表明，近似孪晶相关的板条可以形成相同的惯习面，并且这种板条在包中的排列将提供形状应变的显著程度的相互适应。
The double lattice invariant shear version of the phenomenological theory, has been used to explain all the known crystallographic features of lath martensite. When the lattice invariant shear systems are taken to be rational slip systems in martensite with slip directions along [111] and [111], the habit plane solutions converge to an (hhl) hab plane that coincides with, or is close to, (557). Up to 35 different combinations of these rational lattice invariant shear systems lead to (hhl) habit planes that lie 9° to 14° from (111). The theory correctly predicts the habit plane, the orientation relationship, (including the observed spread in the angle between the close packed directions [110] and [111]), the shape strain, the internal substructure of dense dislocations with a/[111] dislocations dominant, and the presence of an array of a/[111] dislocations approximately 3.5 nm apart in the austenite/martensite interface. The theoretical explanation of lath martensite also indicates that approximately twin-related laths can form with the same habit plane, and that this arrangement of laths in a packet will provide a significant degree of mutual accomodation of the shape strain.