CRYSTALLOGRAPGY OF LATH MARTENSITE IN ULTRAHIGH-STRENGTH STEEL 300M

Acta Metall Sin

1993, Vol. 29

Issue (7): 28-33 DOI:

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CRYSTALLOGRAPGY OF LATH MARTENSITE IN ULTRAHIGH-STRENGTH STEEL 300M

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LUO Chengping;XU Linkang;CHA Jianzhong South-China University of Technology; Guangzhou Guangdong Iron and Steel Research InstituteDepartment of Mechanical Engineering(Ⅱ);South-China University of Technology; Guangzhou 510641. CRYSTALLOGRAPGY OF LATH MARTENSITE IN ULTRAHIGH-STRENGTH STEEL 300M. Acta Metall Sin, 1993, 29(7): 28-33.

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Abstract A TEM study was made of the crystallography of the lath martensite formedin a Ultrahigh-strength steel 300M. It was found that the habit plane is close to {335}_A, theorientation relationship between the martensite and austenite is the G-T one which is 2.5°away from the K-S relationship, and the laths relate to each other by a relative rotation ofabout 60° about the normal to their common planes {110}_M. Although various orientationrelationships, including a near {112}_M twin one, could be formed between the lathsthemselves due to the rotations, a unique G-T orientation relationship was kept between thelath and austenite.

Key words: lath martensite habit plane ultrahigh-strenth steel steel 300M

Received: 18 July 1993

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