Microstructure and Properties of A Carbide--Free Bainite-Martensite Ultra--High Strength Steel

Acta Metall Sin

2004, Vol. 40

Issue (3): 296-300 DOI:

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Microstructure and Properties of A Carbide--Free Bainite-Martensite Ultra--High Strength Steel

YANG Fubao; BAI Bingzhe; LIU Dongyu; CHANG Kaidi; WEI Dongyuan;

Department of Materials Science and Engineering; Tsinghua University

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YANG Fubao; BAI Bingzhe; LIU Dongyu; CHANG Kaidi; WEI Dongyuan. Microstructure and Properties of A Carbide--Free Bainite-Martensite Ultra--High Strength Steel. Acta Metall Sin, 2004, 40(3): 296-300 .

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Abstract The main ideas of component and structure designing for novel high strength and toughness Mn--Si--Cr bainitic steel are presented.Microstructure, delayed fracture mechanism and fatigue property have been analysis based on the excellent mechanical properties. The improvement in strength and toughness can be contributed to distinctive microstructure of duplex steel. The bainitic carbide is replaced by retained austenite film, which exhibits a better mechanical stability, thermal stability and chemical stability. The film also acts as a hydrogen trap, inhibiting crack propagation, and lower the susceptibility to hydrogen embrittlement.

Key words: carbide free bainite duplex steel retained austenite

Received: 08 March 2003

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	YANG Fubao
	BAI Bingzhe
	LIU Dongyu
	CHANG Kaidi
	WEI Dongyuan

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2004/V40/I3/296

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