细晶强化和位错强化对中锰马氏体钢的强化作用

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Abstract Effect of carbon and manganese content on the mechanical properties and microstructure characteristics of the medium manganese steels quenched in oil, such as dislocation density, volume fraction of retained austenite and grain size were investigated. Microstructures of the medium manganese steels were observed by SEM/EBSD, TEM and XRD techniques and tensile test was conducted at room temperature to examine their mechanical properties. Strengthening mechanisms operating in martensitic steel and the effects of carbon content on the strengthening contributions of the grain refinement and dislocation were discussed. It is found that increasing the carbon content increases the dislocation density, volume of retained austenite and the percent of high angel grain boundaries, but decreases the size of packet and block. This in turn increases the yield strength and tensile strength. Increasing manganese content increases the dislocation density and tensile strength. Dislocation strengthening and grain refinement strengthening are the main strengthening mechanisms operating in as-quenched martensitic steels. According to the strengthening calculation, it is proposed that the microstructure unit controlling the strength of martensite steels is the pre-austenite grain size for the yield strength but the lath size for the tensile strength.

Received: 12 April 2011 Published: 05 September 2012

PACS:

TG142.1

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	Articles by authors
	DIAO Jie
	YU Cun-Yu
	SHI Cha
	LI Jian
	PU Jian

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DIAO Jie,YU Cun-Yu,SHI Cha等. Effect of Grain Refinement Strengthening and Dislocation Strengthening on Strength of Medium Manganese Martensitic Steels[J]. Iron and Steel, 2012, 47(8): 57-61.

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http://www.chinamet.cn/Jweb_gt/EN/ OR http://www.chinamet.cn/Jweb_gt/EN/Y2012/V47/I8/57

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