工业纯铁自纳米化组织的EBSD分析

运用高能喷丸技术实现了工业纯铁表面自纳米化，利用电子背散射衍射（ElectronBackscatteredDiffraction，EBSD）对自纳米化组织的结构特征进行了分析，在此基础上探讨了工业纯铁自纳米化机理。结果表明，工业纯铁自纳米化组织由三个典型区域组成，分别含有大量残存住错，大角度晶界及大量小角度晶界。自纳米化组织含有再结晶织构和形变织构，但由于晶粒取向差不同，变形难易程度不同导致两种织构的比例不同。位错运动、晶粒取向差不同导致变形不同步及发生再结晶是工业纯铁表面自纳米化过程中晶粒细化的主要原因。

EBSD Analysis of Microstructures of Surface Self--nanocrystallined Industrial Pure Iron

A self--nanocrystalline Fe layer was prepared on an industry pure iron cylinder by means of high energy shot peening （HESP） . The microstructures of the nanoerystalline Fe layer were characterized by electron backscattered diffraction （EBSD）, which helped to investigate the mechanism of the nanoerystallization of the industry pure iron. Results show that the self--nanocrystalline Fe layer was composed by 3 typical zones, which contained a large number of dislocations, high--angle grain boundaries and low--angle grain boundaries respectively. Besides the self--nanocrystalline Fe layer comprised different proportion of recrystallization texture and deformation texture. The movement of dislocations, the synchronous deformation he- cause of grain orientation and recrystallization were 3 main reasons for the grain refining of the iron during HESP.