The Microstructures of Hot Rolled Stainless Steel

by Weite Wu, Hung Chih Hsieh, Dong Yih Lin

Publisher - National Chung Hsing University, I-Shou University

Category - General Novel

The effects of various reduction ratios on the precipitation behavior of the  phase in 304 and 430 stainless steels as hot-rolled at 800℃ have been investigated in this study. The morphology, quantity and chemical composition of the σ phase were analyzed by using optical microscopy, X-ray diffractometry, image analysis, scanning electron microscopy, and energy dispersive spectrometry, respectively. The σ phase showed a dendrite-like morphology in the as-received materials. A hot-rolling process changed the morphology of the  phase from dendrite-like to globular, especially at higher reduction ratio. The amounts of δ-ferrite and σ phase in the stainless steels decreased gradually at 800℃ with increasing the reduction ratio from 0 to 75%. A higher reduction ratio enhanced the conversion of -ferrite to  phase.

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