Microstructure analysis and quantitative strengthening evaluation of medium carbon bainitic multiphase steel
Source abstract
Abstract
The microstructure and properties of bainitic multiphase steels with bainitic ferrite as the main phase are the focus of the current research. In the work, multiphase microstructures of pre-formed martensite (PM), bainitic ferrite (BF), and retained austenite (RA) was obtained via austempering processes in medium carbon bainitic steel. The relationship between the multiphase characteristics and mechanical properties was analyzed quantitatively. The results show that the thickness of bainitic ferrite laths and the size of blocky retained austenite of the PM-BF-RA samples are smaller than those of the BF-RA samples. The dislocation density of bainitic ferrite and carbon content in retained austenite of the PM-BF-RA samples are higher. The PM-BF-RA samples obtain higher strength. The yield strength that was calculated by measured microstructural parameters is similar to the tested value. The dominant strengthening phases of PM-BF-RA samples are pre-formed martensite and bainitic ferrite dual phases, while those of the BF-RA samples are the bainitic ferrite. The main of the strengthening mechanism of bainitic ferrite is grain boundary strengthening, while it is solid solution strengthening for martensite and retained austenite. Small and stable retained austenite with high carbon content effectively ensures the high plasticity of PM-BF-RA samples. Moreover, the high toughness of PM-BF-RA samples can be attributed to fine bainitic ferrite and small blocky retained austenite. This study demonstrates that medium carbon bainitic multiphase steel with PM-BF-RA microstructure exhibits excellent combination of strength, plasticity, and toughness.
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Research context
OpenAlex topics: Microstructure and Mechanical Properties of Steels · Metal Alloys Wear and Properties · Magnetic Properties and Applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (52)
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