TEM STUDY OF SECONDARY HARDENING OF MARTENSITE IN HIGH SPEED STEEL

Acta Metall Sin

1992, Vol. 28

Issue (7): 19-24 DOI:

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TEM STUDY OF SECONDARY HARDENING OF MARTENSITE IN HIGH SPEED STEEL

QIU Jun; YUAN Yi; CHEN Jingrong(University of Science and Technology Beijing)

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QIU Jun; YUAN Yi; CHEN Jingrong(University of Science and Technology Beijing). TEM STUDY OF SECONDARY HARDENING OF MARTENSITE IN HIGH SPEED STEEL. Acta Metall Sin, 1992, 28(7): 19-24.

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Abstract The precipitate phases of M42 matrix high speed steel, containing 4%Co, tempered in temperature range of 250 to 700℃ have been investigated. M_3C precipitate, mainly Fe_3C, occurs in the steel tempered at lower temperature, and lessens gradually over 400℃. Changing of diffracted streaks and fcc M_2C, mainly Mo_2C, are observed after tempered at 500 —560℃ and 580℃ respectively. When tempering temperature up to 700℃, all fcc M_2C transforms into hcp M_2C, and also VC, Cr_(23)C_6. The diffracted streaks are believed to be due to the segregation of alloying elements Mo and W together with C on {100}_α′,, and the change from mix-cluster to transition phase fcc M_2C, which results in secondary hardening of M42 matrix steel after tempering.

Key words: high speed steel secondary hardening precipitation mix-cluster

Received: 18 July 1992

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