Effect of Pre-Formed Microstructure on Mechanical Properties of Bainitic Steel

Achieving high strength, high toughness, and high plasticity in bainitic steel to meet the needs of economic and industrial development is the direction and driving force for researchers. The reinforcement technology of bainitic steel has become very well developed, with research conducted on microstructure, dislocation density, and alloying elements. While improving strength, some plasticity and toughness are inevitably sacrificed. Therefore, achieving high strength, high plasticity, and high toughness in bainitic steel has always been a research focus. Existing research has shown that pre-transformation before the bainitic transformation can help increase the bainitic transformation rate and thereby regulate the microstructure. This paper will conduct a detailed analysis of the influence of pre-phase transformation microstructure on the strength, toughness and plasticity of bainitic steel.