Effect of continuous casting on segregation and carbide of M2 high speed steel
YAO Jian1, MAN Ting-hui1,2, LIU Yu1,2, ZHU Xi-da3, DONG Han1,2
1. School of Materials and Science Engineering, Shanghai University, Shanghai 200444, China; 2. Zhejiang Institute of Advanced Materials, SHU, Jiashan 314113, Zhejiang, China; 3. Jiangyin China Resources Steelmaking Co., Ltd., Jiangyin 214404, Jiangsu, China
Abstract：In order to improve the internal quality of continuous casting billet including the structure uniformity, macro-segregation and carbides for accelerating the industrialization of continuous casting, the microstructures of M2 high speed steel produced by curved continuous casting and following hot working processes, especially macro-segregation and carbide evolution, were investigated using metal in-situ analyzer, direct reading spectrometer, scanning electron microscope and X-ray diffractometer, and they were compared to that produced by ingot casting. The results show that the maximum size of carbide and secondary dendrite spacing in the curved continuous casting M2 high speed steel are reduced by approximately 44% and 20%, respectively, compared to that of the ingot casting M2 high speed steel. In addition, the morphology of carbide presents fibrous, and after heat treatments it will be decomposed and refined. Furthermore, the size of carbide exhibits more uniform for the curved continuous casting M2 high speed steel after forging-rolling, there is no obvious large carbide and the maximum size of carbide is less than 10 μm.
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YAO Jian, MAN Ting-hui, LIU Yu, ZHU Xi-da, DONG Han. Effect of continuous casting on segregation and carbide of M2 high speed steel[J]. China Metallurgy, 2023, 33(3): 77-84.
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2023, Vol. 33 
