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对硅钢板材分别进行异步和同步轧制,研究了轧制参数包括速比、压下量和道次对板材表面显微组织的演变的作用.结果表明,异步轧制硅钢板材表面形成了晶粒尺寸为10~50 nm,取向接近随机分布的纳米晶,而同步轧制板材的表面只形成了位错胞,证明异步轧制可以诱发表面纳米化.异步轧制板材表面纳米晶的形成过程为:在剪切力的反复作用下,高密度位错形成、滑移、湮灭和重组形成亚微米尺度的亚微晶/位错胞.随着压下量和轧制道次增加,高密度位错重复以上过程使晶粒尺寸减小、取向差增大,最终形成取向接近随机分布的纳米晶组织.大压下量和多道次是异步轧制诱发板材表面纳米化的关键,而速比的增加可以加快纳米化进程.
The effects of rolling parameters including speed ratio, reduction ratio and pass number on the microstructure evolution of sheet metal surface were studied respectively by means of asynchronous and synchronous rolling of silicon steel sheet.The results showed that the surface of asynchronously rolled silicon steel sheet formed grains The size of 10 ~ 50 nm, oriented near the random distribution of nanocrystals, and the surface of the synchronous rolling plate only dislocation cells formed, proving that the asynchronous rolling can induce surface nanocrystallization. Nanocrystalline surface asynchronously rolling nanocrystalline formation process : Under the repeated action of shear stress, high density dislocations form, slide, annihilate and recombine to form submicron-scale submicron / dislocated cells.With the reduction and rolling pass increase, The process of mis-repeat the above process to reduce the grain size, orientation difference increases, the final formation of nearly random orientation orientation nano-crystal structure. Large reduction and multi-pass rolling is the key to induction of nano-sheet metal surface rolling, The increase can speed up the process of nanocrystallization.