IN SITU OBSERVATION OF LOWER BAINITIC CARBIDES PRECIPITATION

Acta Metallurgica Sinica (English Letters) ›› 1989, Vol. 2 ›› Issue (3): 222-224.

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IN SITU OBSERVATION OF LOWER BAINITIC CARBIDES PRECIPITATION

KANG Mokuang SUN Jialin Northwestern Polytechnical University,Xi'an,China Dept.of Materials Science and Engineering Northwestern Polytechnical University,Xi'an,710036,China

Received:1989-06-25 Revised:1989-06-25 Online:1989-06-25 Published:2009-10-10

Abstract

Abstract: The lower bainitic carbides precipitation in 40CrMnSiMoV steel previously austempered at 310℃ was observed in situ by employing a high temperature stage of an ultra high voltage TEM(JEM-1000).The typical lower bamitic carbides were found to have precipitated from within the carbide-free bainitic ferrite after tempering for certain period at a temperature higher than that of the isothermal transformation.This revealed that the lower bainitic ferrite is supersaturated with carbon to some extent.The carbide may also precipitate from austenite, but they have no typical morphological features of lower bainitic carbide.

Key words: bainite transformation, carbide precipitation, supersaturation, high voltage transmission electron microscopy

KANG Mokuang SUN Jialin Northwestern Polytechnical University,Xi'an,China Dept.of Materials Science and Engineering Northwestern Polytechnical University,Xi'an,710036,China. IN SITU OBSERVATION OF LOWER BAINITIC CARBIDES PRECIPITATION[J]. Acta Metallurgica Sinica (English Letters), 1989, 2(3): 222-224.

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IN SITU OBSERVATION OF LOWER BAINITIC CARBIDES PRECIPITATION

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