SUBMICRON-NANOCRYSTALLIZATION OF LOW CARBON STEELS THROUGH TRANSFORMATION MECHANISM

Acta Metall Sin

2007, Vol. 42

Issue (1): 59-63 DOI:

Research Articles

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SUBMICRON-NANOCRYSTALLIZATION OF LOW CARBON STEELS THROUGH TRANSFORMATION MECHANISM

Lin－Xiu DU;;;

东北大学

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Lin－Xiu DU. SUBMICRON-NANOCRYSTALLIZATION OF LOW CARBON STEELS THROUGH TRANSFORMATION MECHANISM. Acta Metall Sin, 2007, 42(1): 59-63 .

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Abstract For low carbon micro-alloyed steel, a process of nanocrystallization of steels through transformation mechanism was investigated. The austenite grain size was refined to 1~2m through heavy warmly deformation intigrating with repeatly heating and quenching; under common continous cooling conditions, the ferrite grain size transformed from1~2m ultrafine austenite will be near to or larger than the original austenite grian size, i.e.,d/d>1;but if the heavy deformation was applied below Ar3 during cooling, the uniform and equiaxed ferrites with grain size of 0.1~0.3冚m, close to nanosize, can be obtained. The results indicate that heavy warm deformation can make the carbides in original microstructrures distribute uniformly, and this accelerate the dissolving of the carbides and the formation of ultrafine austenite. The main mechanism of deformation induced ferrite transformation of ultrafine austenite is that the nucleation of ferrite along austenite boundarie is enhenced by the boundary slipping of austenite grains.

Key words: nanocrystallization transformation deformation grain ultrafinement low carbon steels

Received: 23 May 2006

ZTFLH:

TG113.2

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2007/V42/I1/59

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