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Increasing Solidification Rate of M2 High-Speed Steel Ingot by Fusible Metal Mold

Acta Metallurgica Sinica(English Letters) 2016年第4期29卷 382-387页

作者： Yan-Liang Ji Wei Zhang Xiao-Yang Chen Jian-Guo Li School of Materials Science and Engineering Shanghai Jiao Tong University

As one of the most popular used high-speed steels, M2 possesses excellent hardness and toughness as cutting tools. Networks of eutectic carbides distributing in the inter-dendritic region are academically considered to be the typical microstructure of M2, which can be refined by increasing cooling rate. In this paper, a novel casting method named fusible metal mold （FMM） is employed to refine the microstructure of M2 high-speed steel. Results show that FMM casting method can improve cooling rate by 100% without any contamination of the melts＇ composition.

关键词： Carbide Cooling rate Solidification process Microstructure dendritic spacing

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RESEARCH ON THE FORMATION MECHANISM OF INTERNAL CRACK IN THE CONTINUOUS CASTING SLAB

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Acta Metallurgica Sinica(English Letters) 2007年第1期20卷 35-39页

作者： G.W. Chang G.C. Jin S.Y. Chen X.D. Yue Department of Materials ＆ Chemical Engineering Liaoning Institute of Technology Jinzhou 121000 China

In view of the periodic bending deformation of solid-liquid interface in the solidification process for continuous casting slab, the variation of temperature gradient and dendritic spacing in the front edge of the solid-liquid interface, and the nucleation and propagation process of crack were studied. It is shown that the bending deformation of the interface results in the temperature field change in the front edge of solid-liquid interface, and the occurrence of temperature gradient along drawing direction results in the growth of secondary dendrites. The initial crack formed during the middle and final stage of solidification may extend to the surface of the casting slab and become an internal crack. The results of the theoretical analysis are basically in agreement with that of the experiment.

关键词： continuous casting dendritic spacing internal crack

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Influences of processing parameters on microstructure during investment casting of nickel-base single crystal superalloy DD3

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China Foundry 2012年第2期9卷 159-164页

作者： Gao Sifeng Liu Lin Xu Yiku Yang Chubin Zhang Jun Fu Hengzhi State Key Laboratory of Solidification Processing Northwestern Polytechnic UniversityXi'an 710072China

The effects of solidification variables on the as-cast microstructures of nickel-base single crystal superalloy DD3 have been investigated by using the modified Bridgman apparatus. The experiments were performed under a thermal gradient of approximately 45 ***-1 and at withdrawal rates ranging from 30 to 200 m.s-1. The experimental results show that the primary and secondary dendritic arm spacings （PDAS and SDAS） decrease when the withdrawal rate is increased. Compared with the theoretical models of PDAS, the results are in good agreement with Trivedi＇s model. The relationships of PDAS and SDAS with withdrawal rates can be described as ;λ1 = 649.7V-0.24±0.02 and λ2 = 281 V-0.32±0.03, respectively. In addition, the size of the λ2 phase significantly decreases with increasing withdrawal rate.

关键词： Ni-base superalloys directional solidification γ′phase dendritic spacing

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