High Ductility and Toughness of a Micro-duplex Medium-Mn Steel in a Large Temperature Range from -196 ℃ to 200

A medium-Mn steel （0.2C5Mn） was processed by intercritical annealing at different temperatures （625 ℃ and 650 ℃ ）. An ultrafine-grained micro-duplex structure consisting of alternating austenite and ferrite laths was de- veloped by austenite reverse transformation （ART） during intercritical annealin...

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Published in:钢铁研究学报：英文版 2015 (12), p.1126-1130
Main Author: Si-lian CHEN Jun HU Xiao-dan ZHANG Han DONG Wen-quan CAO
Format: Article
Language:English
Subjects:
双相介质
微相结构
温度范围
稳定性控制
退火处理
逆转变奥氏体
高韧性
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Summary:A medium-Mn steel （0.2C5Mn） was processed by intercritical annealing at different temperatures （625 ℃ and 650 ℃ ）. An ultrafine-grained micro-duplex structure consisting of alternating austenite and ferrite laths was de- veloped by austenite reverse transformation （ART） during intercritical annealing after forging and hot rolling. Ultra- high ductility with a total elongation higher than 30% was achieved in the temperature range from -196 ℃ to 200 ℃, and high impact toughness no less than 200 J at -40 ℃ was obtained. Based on the analysis of microstructure and mechanical properties, it was found that the enhanced ductility was determined by the phase transformation effect of austenite （TRIP effect）, while the delayed ductile to brittle transition was controlled by austenite stability.
ISSN:1006-706X
2210-3988