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INFLUENCE OF ROLLING PROCESSES ON THE MICROSTRUCTURES AND MECHANICAL PROPERTIES OF A 19CR1.5MO0.5W FERRITIC STAINLESS STEEL

Autoria

Chen, Liqing; Liu, Houlong; Liu, Lingling; Ma, Mingyu; Tong, Weiping

DOI

10.5151/9785-9785-32308

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Resumo

 

In this presentation, a 444-type heat-resistant ferritic stainless steel containing 0.05wt% Ce and 2wt% (Mo+W) was used as an experimental material and a study was carried out on the effect of rolling processes on the microstructures and texture evolution as well as on the mechanical properties and formability. The rolling processes contain hot rolling at different hot rolling finish temperatures, annealing after hot rolling, cold rolling and subsequent annealing. As for the hot rolling process, two hot rolling finish temperatures, 1133 K and 1043 K, were adopted, and their influence on the microstructures and mechanical properties was comparatively studied. The results showed that the microstructures after hot rolling and subsequent annealing could be refined by lowering the hot rolling finish temperature. The resultant microstructures after cold rolling and annealing were hereditarily refined. Lowering the hot rolling finish temperature can weaken the ALPHA-fiber texture in hot rolled or cold rolled ferritic stainless steel strip. However, the BETA-fiber texture was homogeneously strengthened by annealing the cold rolled ferritic stainless steel strip. Enhanced mechanical property and formability in terms of strength and average plastic strain ratio could be obtained by lowering the hot rolling finish temperature of ferritic stainless steel.

Palavras-chave

ferritic stainless steel; rolling process; microstructure; texture; mechanical property; formability