Abstract：Low carbon bainitic steels usually require the addition of an appropriate amount of alloying elements to improve performance. In order to study the function of Cr and Al in bainitic steels,three steels with different addition of Cr and Al based on composition of Fe-C-Si-Mn-Mo were designed. The effects of Cr and Al addition on microstructure,mechanical property and bainitic transformation in low carbon bainitc steel during the continuous cooling treatment were investigated. The results show that Cr addition can drive the bainitic transformation to a lower temperature range during the continuous cooling process. The yield and tensile strength can be enhanced by adding Cr due to the refining bainitic microstructure. Although Al addition can accelerate the kinetics of bainitic transformation,that has little significance for low carbon bainitic steel. On the contrary,the addition of Al can coarsen the structure of low carbon bainite steel,resulting in the decrease of strength and elongation. In summary,the strength of low carbon Cr-addition bainitic steel is high as 1 623 MPa with a considerable elongation of 10.5%. The optimization effect of Cr addition is significantly better than the composite addition of Cr and Al. The results can provide basis for the composition design of low carbon bainitic steel.
姚耔杉, 胡海江, 田俊羽, 周明星, 徐光. 铬和铝元素对低碳贝氏体钢组织和性能影响[J]. 钢铁, 2020, 55(12): 66-71.
YAO Zi-shan, HU Hai-jiang, TIAN Jun-yu, ZHOU Ming-xing, XU Guang. Effect of Cr and Al on microstructure and properties of low carbon bainitic steels[J]. Iron and Steel, 2020, 55(12): 66-71.
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2020, Vol. 55 
