In situ observation of the effect of Al N particles on bainitic transformation in a carbide-free medium carbon steel |
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作者姓名: | Xiao-jie Zhao Zhi-nan Yang Fu-cheng Zhang |
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作者单位: | 1)State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China |
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基金项目: | This work was financially supported by the Research Project of Hebei Provincial Department of Education(No.QN2018144);the National Natural Science Foundation of China(No.51831008). |
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摘 要: | The bainitic transformation of the steels with different mass fractions of N, ~0.002% and 0.021%, was observed in situ by using high-temperature metalloscope. Micrometer-and nanometer-sized aluminum nitride(AlN) particles were found in the steel with 0.021% N.Grain boundaries, the interior of the grains, and Al N particles were used as initial nucleation sites of bainitic ferrite, and bainitic ferrite subunits served as new nucleation sites to induce secondary nucleation. The lengthening rate of bainitic ferrite varied at different nucleation sites, which was controlled by the repeated nucleation and growth of bainitic subunits. The Al N particles not only provided several nucleation sites, but also increased the autocatalytic effect on the transformation, further shortening the incubation period, promoting the bainitic transformation, and refining the bainitic microstructure.
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关 键 词: | bainitic steel In SITU OBSERVATION phase TRANSFORMATION aluminum NITRIDE |
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