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CHARACTER OF CARBON-DEPLETED REGIONS IN UNDERCOOLED AUSTENITE AND THERMODYANMICS OF BAINITIC TRANSFORMATION

YANG Quanmin KANG Mokuang Northwestern Polytechnical University , Xi'an , China YANG Quanmin , Dept.of Material Science and Engineering , Zhejiang University , Hangzhou 310027 , China

金属学报(英文版)

The chemical driving forces for the phase transformation from austenite in three different car- bon-depleted regions into ferrite with the identical composition have been derived respectively. The starting temperature of bainitic transformation,B_s,has also been calculated according to the shearing mechanism of bainitic transformation in carbon-depleted regions of austenite. The maximum driving forces for banitic transformation at B_s in both 3% Cr and the CrMo steels were obtained.It was shown that the proposed shearing mechanism of the bainitic trans- formation is thermodynamically possible.

关键词: bainitic , null , null

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