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Title

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

Authorship

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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Abstract

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.

Keywords

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