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| Effect of Quenching Process on The Microstructure And Mechanical Property of 20Mn2 Steel Containing ZrC Particles |
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| 中南大学 |
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Cite this article:
;. Effect of Quenching Process on The Microstructure And Mechanical Property of 20Mn2 Steel Containing ZrC Particles. Chin J Mater Res, 2004, 18(1): 39-39.
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Abstract Effect of quenching process on the microstructure and mechanical property of 20Mn2 steel containing ZrC of 0.2% in volume fraction and 0.2~1.2μm in diameter after rolling with large total reduction has been investigated.Experimental results show that at state qenched in water, the mechanical property of 20Mn2 reaches σb=1854Mpa、σ0.2=1722Mpa、δ5=12.6%，after tempered at 200℃ for 200min，that of 20Mn2 reachesσb=1685Mpa、σ0.2=1582Mpa、δ5=14.1%；in the state quenched in oil，that of 20Mn2 reaches σb=1073Mpa、σ0.2=839Mpa、δ5=19%，after tempered at 200℃ for 200min，that of 20Mn2 reachesσb=1039Mpa、σ0.2=810Mpa、δ5=21.1%．It is indicated that ZrC partical plays an obvious active role in grain super-refining of austenite by acting as a deformation nucleus and recrystallization nucleus,and obvious refined grain increases critical cooling rate for obtaining matensite that decreases the number、length and width of matensite in water-quenching state，and the number of pearlite in oil-quenching state while ferric carbide becomes shorter and thinner．Meanwhile，in subsequent cooling refined austenite grain transforms to a finer ferrite grain（1~2 um），and keeps in deformed microstructrue in hot rolling，which leads to a double increase in the strength of 20Mn2 in water-quenching state without decrease in enlogation，and a double increase in enlogation of oil-quenching state with a concurrent great increase in the strength．
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Received: 28 January 2003
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