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通过采用电磁搅拌制备高碳钢半固态流变浆料并进行半固态成形的方法,研究Cr5MoV、Cr12和Cr12V等高碳钢在电磁搅拌条件下的半固态组织演变过程。结果表明:电磁搅拌可以获得非枝晶的初生奥氏体。随着搅拌时间的增加,初生奥氏体的形貌变得愈来愈圆整。在较高固相分数的条件下搅拌,初生奥氏体固相颗粒有粘连现象。EBSD分析结果表明:粘连的固相颗粒呈不同的位向。这些不同位向的颗粒是从不同的晶核生长出来的,在电磁搅拌作用下相互撞击而粘附在一起。
The semi-solid microstructure evolution of high-carbon steels such as Cr5MoV, Cr12 and Cr12V was investigated by using electromagnetic stirring to prepare semi-solid high-carbon steel slurry and semi-solid forming. The results show that non-dendritic primary austenite can be obtained by electromagnetic stirring. As the stirring time increases, the morphology of primary austenite becomes more and more rounded. Stirring at a higher solid fraction, the primary austenite solid phase particles are stuck. The results of EBSD analysis show that the immobilized solid particles have different orientation. These different orientation particles grow from different nuclei and collide with each other and stick together under electromagnetic stirring.