Characterization of a low carbon low alloy steel by nanoindentation

Acta Metall Sin

2005, Vol. 41

Issue (3): 287-290 DOI:

Research Articles

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Characterization of a low carbon low alloy steel by nanoindentation

SONG Hongwei; SHI Bi; WANG Xiufang; ZHANG Junbao

Baosteel Technology Center; Baoshan Iron & Steel Co.; Ltd.; Shanghai 201900

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SONG Hongwei; SHI Bi; WANG Xiufang; ZHANG Junbao. Characterization of a low carbon low alloy steel by nanoindentation. Acta Metall Sin, 2005, 41(3): 287-290 .

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Abstract A low carbon low alloy steel with two different types of microstructures was characterized by nanoindentation. The results indicate that the average nanoindentation hardness of martensite is at least 70\% higher than that of ferrite in the dual-phase sample. Since the ultrafine martensite grain is embedded in the soft ferrite matrix, the nanoindentation hardness of martensite exhibits a substrate-effect when the indentation depth is over 40 nm. Due to more carbon atoms partitioning to austenite during intercritical process, carbon content of martensite in the dual-phase sample may be several times higher than the nominal carbon content of the steel, which makes the average nanoindentation hardness of martensite in the dual-phase sample is at least 30% higher than that in the fully martensitic sample. In addition, the possible effects of carbon partitioning on Poisson ratio and Young's modulus of martensite were discused briefly.

Key words: steel ferrite martensite nanoindentation hardness

Received: 06 April 2004

ZTFLH:	TG113.25
	TG142.33

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	SONG Hongwei
	SHI Bi
	WANG Xiufang
	ZHANG Junbao

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2005/V41/I3/287

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