Effect of initial grain size on dynamic recrystallization of ultra-large nuclear rotor steel 25Cr2Ni4MoV

IF 3 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Xina Huang , Sirui Guo , Wenjing Chen
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引用次数: 0

Abstract

The effects of different initial grain sizes on dynamic recrystallization (DRX) of ultra-large nuclear rotor steel 25Cr2Ni4MoV based on the isothermal hot-compression tests under different deformation conditions were systematically investigated. The results show that the strain rate is faster, the smaller the initial grain size, the easier DRX occurs. The average grain size of DRX is positively correlated with deformation temperature, negatively correlated with strain rate, and positively correlated with initial grain size. At higher strain rates, the initial grain size has less effect on the average grain size of DRX. However, the degree of DRX is higher in the specimen with a smaller initial grain size. The DRX model was constructed of 25Cr2Ni4MoV with initial grain sizes of 33μm, 179μm, and 1577 μm based on the experimental data. The DRX average grain size models have good fitting accuracy, and the DRX percentage models are consistent with the DRX degree shown by the flow stress strain curves. when DRX occurs sufficiently and the strain rate is low, the larger the initial grain size is, the smaller the critical strain of DRX is, and the easier it is for DRX to occur.

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来源期刊
Materialia
Materialia MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
6.40
自引率
2.90%
发文量
345
审稿时长
36 days
期刊介绍: Materialia is a multidisciplinary journal of materials science and engineering that publishes original peer-reviewed research articles. Articles in Materialia advance the understanding of the relationship between processing, structure, property, and function of materials. Materialia publishes full-length research articles, review articles, and letters (short communications). In addition to receiving direct submissions, Materialia also accepts transfers from Acta Materialia, Inc. partner journals. Materialia offers authors the choice to publish on an open access model (with author fee), or on a subscription model (with no author fee).
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