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Solidification microstructure of Cr4Mo4V steel forged in the semi-solid state
Liu, Weifeng; Cao, Yanfei; Guo, Yifeng; Sun, Mingyue; Xu, Bin; Li, Dianzhong
2020-02-01
Source PublicationJOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
Volume38Pages:170-182
AbstractSemi-solid forging of iron-based alloys during solidification has unique characteristics distinct from those of the classical hot forging. With the aim of acquiring precise knowledge concerning the microstructural evolution of bearing steel Cr4Mo4V in this process, a series of semi-solid forging experiments were carried out in which samples were wrapped in a designed pure iron sheath. The effects of forging temperature and forging reduction on the grain morphology and liquid flow behavior were investigated, respectively. By forging solidifying metal (FSM), bulky primary dendrites were broken and spheroidal grains with an average shape factor of 0.87 were obtained at 1360 degrees C. With the decreasing forging temperature to 1340 degrees C, the microstructural homogeneity can be improved. On the other hand, it shows that a higher forging reduction (50%) is essential for the spheroidization of grains and elimination of liquid segregation. Those microstructural characteristics are related to different motion mechanisms of solid and liquid phases at different forging temperatures. Additionally, the effect of semi-solid forging on the eutectic carbides was also investigated, and the results demonstrate that the higher diffusion capacity and less liquid segregation jointly lower the large eutectic carbides and consequently cause its uniform distribution during FSM. (C) 2019 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
DOI10.1016/j.jmst.2019.07.049
WOS IDWOS:000503164100019
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Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/83150
Collection中国科学院金属研究所
Recommended Citation
GB/T 7714
Liu, Weifeng,Cao, Yanfei,Guo, Yifeng,et al. Solidification microstructure of Cr4Mo4V steel forged in the semi-solid state[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2020,38:170-182.
APA Liu, Weifeng,Cao, Yanfei,Guo, Yifeng,Sun, Mingyue,Xu, Bin,&Li, Dianzhong.(2020).Solidification microstructure of Cr4Mo4V steel forged in the semi-solid state.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,38,170-182.
MLA Liu, Weifeng,et al."Solidification microstructure of Cr4Mo4V steel forged in the semi-solid state".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 38(2020):170-182.
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