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Microstructure Evolving Behaviors of Undercooled Ultrafine Austenite Grains During Deformation

YAO Shengjie , DU Linxiu , LI Guanglong , JIAO Xing , WANG Guodong

钢铁研究学报(英文版)

Samples with ultrafine grained austenite were prepared by repetitive rapid heating and quenching for three times and were used to investigate the dynamic microstructural evolving behaviors at different temperatures. A simultaneous development of dynamic straininduced transformation (DSIT) and austenite grain growth was detected at the deformation temperatures above Ar3, while only DSIT happened as the deformation proceeded at lower temperatures close to and below Ar3. In addition, a reverse ferritetoaustenite transformation was also observed. Most of the straininduced ferrite nucleated on the boundaries of ultrafine prior austenite grains, especially at the corners and no evidence about intragranular nucleus was obviously obtained.

关键词: ultrafine grained austenite , ferrite , dynamic straininduced transformation (DSIT) , grain growth

Effect of WarmRolled Pearlite Microstructural Features on Austenitic Transformation

YAO Shengjie , DU Linxiu , LIU Xianghua , WANG Guodong

钢铁研究学报(英文版)

The austenite transformation characteristics for various warmrolled pearlite during rapid heating were investigated. The results indicate that the start temperature (Ts) is sensitive to the microstructural feature of pearlite, whereas the dislocation plays an important role in the transformation rate; at the same time, the uniformity of austenite grains is more or less affected by the amount of spheroidized pearlite. A critical effect on the state of austenite grain is created through the influence of initial microstructures on the start temperature of transformation.

关键词: warm rolling;pearlite;dislocation;austenite;transformation

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