• Title/Summary/Keyword: Microstructure evolution

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A Study on Dynamic and Static Recrystallization Behaviors and Microstructure Evolution Prediction of a Die Steel (금형강의 동적 및 정적 재결정 거동과 미세조직 변화 예측에 관한 연구)

  • 정호승;조종래;차도진;배원병
    • Transactions of Materials Processing
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    • v.10 no.4
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    • pp.338-346
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    • 2001

  • Evaluation of microstructural changes is important for process control during open die forging of heavy ingots. The control of forging parameters, such as shape of the dies, reduction, temperature and sequence of passes, is to maximize the forging effects and to minimize inhomogeneities of mechanical properties. The hot working die steel is produced by using the multistage open die forging. The structure is altered during forging by subsequent Precesses of plastic deformation, recrystallization and grain growth. A numerical analysis using an rigid visco-plastic finite element model was performed to predict microstructural evolution of hot working die steel.

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Effect of Initial Orientation and Austenitic Phase on Texture Evolution in Ferritic Stainless Steels (페라이트계 스테인레스강의 집합조직 형성에 미치는 초기 방위 및 오스테나이트사의 영향)

  • 이용득
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 1999.03a
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    • pp.149-152
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    • 1999

  • The effect of initial orientation on the microstructure and texture evolution of two ferritic stainless steels was investigated. the columnar and equiaxed crystal specimens which were prepared from continuous casting slab were hot rolled annealed cold rolled and annealed respectively. The rolling and recrystallization textures at each process stage were examined by orientation distribution function (ODF) and electron back-scattered diffraction (EBSD); The observation showed that the orientation density of the $\alpha$-fibre of hot rolled band of columnar crystal specimen was more pronounced than that of the equaxed one at the center layer. Nevertheless the cold rolled textures of Type 430 steel have demonstrated a rather similar development . Compared to Type 430 steel the development of the $\alpha$-fibre in the center layer of Type 409L steel was much more pronounced. The relation between texture evolution and ridging behaviour has been discussed.

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