PREDICTION OF MICROSTRUCTURE EVOLUTION DURING HOT EXPANDING-EXTRUSION FORMING OF RESTRAINING RINGS

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A mathematic model for dynamic and static recrystallization of Mn18Cr18N steel is presented.Hot expanding-extrusion forming and air cooling process of 600 MW retaining ring has been simulated by the combination of thermos-coupled rigid viscoplasitic FEM with this model,and grain size distribution on cross-section of ring is shown.The essential results can be provided for use of the new technique.
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