Modification effect of rare earth Ce content on inclusions in 4Cr5MoSiV1 steel

doi:10.13251/j.issn.0254-6051.2022.11.039

Abstract

Abstract: In order to explore the effect of Ce content on inclusions in hot work die steel and its action mechanism, the types, morphology, quantity, size and distribution of inclusions in 4Cr5MoSiV1 steel with different Ce contents were observed and statistically analyzed by means of field emission scanning electron microscope (SEM/EDS) and the attached automatic inclusion analysis system. The results show that the inclusions in the Ce-free specimen are not only larger in number, larger in average size but also more irregular in shape, mainly composing of Mg-Al-O type, MnS and Mg-Al-O covered with MnS. With the increase of Ce content, the number and average size of inclusions in the specimen decrease and change into spherical rare earth sulfur oxides. When the content of Ce in the steel is 0.0070%, the number and average size of inclusions are the least. With the increase of rare earth Ce content to 0.0120%, more sulfur oxide inclusions are formed, and the number and average size of inclusions tend to increase. With the solidification process going on, Ce mainly exists in the tested steel in the form of rare earth sulfur oxides, and more than 60% of the inclusions will be pushed by the solidification front and finally stay near the grain boundary.

Key words: rare earth Ce, 4Cr5MoSiV1 steel, inclusion, modification

CLC Number:

TF763⁺.2

Shi Xuehong, Yang Lilin, Xia Ming, Xu Qihao, Zhao Liping. Modification effect of rare earth Ce content on inclusions in 4Cr5MoSiV1 steel[J]. Heat Treatment of Metals, 2022, 47(11): 223-229.

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