MORPHOLOGY AND SUBSTRUCTURE OF JUJUBE--STONE--LIKE MARTENSITE IN ULTRAHIGH CARBON STEEL

Acta Metall Sin

2009, Vol. 45

Issue (3): 280-284 DOI:

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MORPHOLOGY AND SUBSTRUCTURE OF JUJUBE--STONE--LIKE MARTENSITE IN ULTRAHIGH CARBON STEEL

ZHANG Zhanling¹;LIU Yongning²;YU Guang²;ZHU Jiewu²;HE Tao²

1 School of Materials Science and Engineering; Henan University of Science and Technology; Luoyang 471003 2 State Key Laboratory for Mechanical Behavior of Materials; Xi'an Jiaotong University; Xi'an 710049

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ZHANG Zhanling LIU Yongning YU Guang ZHU Jiewu HE Tao. MORPHOLOGY AND SUBSTRUCTURE OF JUJUBE--STONE--LIKE MARTENSITE IN ULTRAHIGH CARBON STEEL. Acta Metall Sin, 2009, 45(3): 280-284.

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Abstract

In the martensitic transformation of an ultrahigh carbon steel (UHCS) containing 1.58%C, a kind of jujube-stone-like martensite has been observed in addition to lath and twinning martensites. The substructure of the jujube-stone-like martensite is high density dislocation with 10¹³/cm² and no twin has been found. Theoretical analysis based on a disc-like martensite grain shows that the strain energy is not relative to the critical thickness of the disc (2t₀^*) but relative to the critical diameter of the disc (2r₀^*), and the critical nucleation energy ΔG^* is inversely related to the square of the critical aspect ratio, t₀^*/r₀^*, of martensitic grains. When t₀^*/r₀^*<1, martensitic nucleus is disc shape, t₀^*/r₀^*>1, the nucleus is jujube--stone--like and t₀^*/r₀^*>>1, the nucleus is rod shape.

Key words: ultrahigh carbon steel martensite transformation martensite morphology dislocation twinning carbide

Received: 22 August 2008

ZTFLH:

TG142

Fund:

Supported by National Natural Science Foundation of China (Nos.50571077 and 50774029) and ScienceFund for Distinguished Young Scholars of Henan Province (No.074100510011)

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2009/V45/I3/280

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