Microstructure features and carbon partitioning in low temperature bainitic steels: The effect of magnetic field

作者：Dong, Baoqi; Hou, Tingping; Wu, Kaiming^*; Rolfe, Bernie; Kong, Lingxue; Cai, Minghui; Hodgson, Peter^*

来源：Materials Characterization, 2023, 196: 112635.

DOI：10.1016/j.matchar.2022.112635

• High magnetic field
• Low temperature bainitic steel
• Microstructure
• Carbon partitioning
• Phase transformation

The effect of a 12 Tesla magnetic field on the microstructure and carbon partitioning in a low temperature bainitic steel isothermally transformed at 300 degrees C was investigated. The application of the high magnetic field significantly accelerated the formation of bainitic ferrite. The acceleration can be attributed to additional magnetic Gibbs free energy (Delta GM). Compared with a sample transformed without the magnetic field, the bainitic ferrite laths were refined and the distribution became more uniform; the alignment and orientation of the laths was more regular in a given austenite grain. Meanwhile, a high magnetic field promotes carbon partitioning from bainitic ferrite to retained austenite (RA) and increases the carbon accommodation of the retained austenite.

• 单位
  东北大学