Título

EFFECT OF ROLLING PROCESS ON THE MICROSTRUCTURE EVOLUTION AND MECHANICAL PROPERTIES OF 9MN STEEL PAPER TITLE

Autoria

YAN, NING; DI, HONGSHUANG; GONG, XIHUAI; LI, JIANPING; ZHANG, DIANHUA

YAN, NING

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DI, HONGSHUANG

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GONG, XIHUAI

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LI, JIANPING

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ZHANG, DIANHUA

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DOI

10.5151/9785-9785-32235

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Resumo

In this work, we investigated the effect of the rolling process (warm-rolled or cold-rolled) on microstructure evolution and mechanical properties of 9Mn steel. After intercritical annealing at 670°C for 10min, both cold-rolled and warm-rolled microstructures are composed of ultra-fined austenite and intercritical ferrite. The austenite in warm-rolled sample includes two types of morphology, namely equiaxed and lamellar, which exhibits a wide distribution of grain-size. The incomplete recrystallization or recovery behavior of ferrite in warm-rolled and annealed sample results in higher yield strength and shorter yield point elongation. Moreover, the warm-rolled and annealed sample extends the TRIP-related work hardening over a broad strain range, resulting in a better combination of ultimate tensile strength and total elongation.

Palavras-chave

Warm-rolled; Cold-rolled; Microstructure evolution; Mechanical properties;