Cavitation and grain growth during superplastic forming

• Autorzy: Tan M. J. , Liew K. M. , Tan H.
• Języki publikacji: EN

Abstrakty

EN

Purpose: The purpose of the paper is to study the cavitation and grain growth during superplastic forming. Design/methodology/approach: Superplastic alloys exhibit the extremely large elongation to failure by their high strain rate sensitivity. Cavities have widely been observed during superplastic deformation of metals and alloys and lead to the degradation of material properties such as tensile, creep, fatigue and stress-corrosion behavior. In this work, a finite element method is developed, which considers the grain growth and the effect of material damage. Findings: The effects of material parameters and deformation damage on the superplastic deformation process are numerically analyzed, and the means to control cavitation growth is discussed. The microstructural mechanism of grain growth during superplastic deformation is also studied. A new model considering the grain growth is proposed and applied to conventional superplastic materials. The relationships between the strain, the strain rate, the test temperature, the initial grain size and the grain growth respectively in superplastic materials are discussed. Practical implications: The effect of variation of strain rate sensitivity (in value) on the strain limit of the superplastic deformation is investigated, and the theoretically calculated values are compared with the experimental results. Originality/value: A new microstructure model based on the microstructural mechanism of superplastic deformation has been proposed. This model has been successfully applied to analyze conventional superplastic materials.

Słowa kluczowe

EN

finite element method; FEM; cavitation; grain growth; superplastic deformation

PL

metoda elementów skończonych; MES; kawitacja; rozrost ziarna; odkształcenie nadplastyczne

• Wydawca: International OCSCO World Press
• Czasopismo: Journal of Achievements in Materials and Manufacturing Engineering
• Rocznik: 2007
• Tom: Vol. 24, nr 1
• Strony: 307--314
• Opis fizyczny: Bibliogr. 22 poz., rys.

Twórcy

autor

Tan M. J.

autor

Liew K. M.

autor

Tan H.

• School of Mechanical & Aerospace Engineering, Nanyang Technological University, 639798 Singapore,

Bibliografia

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