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本文以实验证明,经900℃正火预处理,可使M_2高速钢的碳化物形状、大小和分布得到改善,使高频加热后“临轧态”的显微组织超细化(晶粒度小于13级,晶粒尺寸达到3μ),因而使钢的可塑性明善改善。文中通过对钻头裂纹处的电镜断口分析,初步探讨了高频热轧过程中的塑性变形机制和断裂机制;并提出实现M_2高速钢“超塑性”轧制的可能性及设想。
The experiment proves that the shape, size and distribution of carbides of M_2 high speed steel can be improved by the normalizing pretreatment at 900 ℃, and the microstructure of “near rolling” state after high frequency heating is superfine (grain size Less than 13, grain size up to 3μ), so that the plasticity of the steel is improved. In this paper, the plastic deformation mechanism and fracture mechanism in high-frequency hot-rolling process are discussed through the electron microscope fracture analysis of the drill bit crack. The possibility and assumption of realizing “superplastic” rolling of M_2 high-speed steel are proposed.