Combining in-situ technology to study the influence of bainite morphology on the strength and toughness properties of medium-carbon bainitic steel

IF 6.2 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Journal of Materials Research and Technology-Jmr&t Pub Date : 2025-03-12 DOI:10.1016/j.jmrt.2025.03.106
Yu Zhang , Wei Liu , Xiaoyan Long , Zeliang Liu , Yanguo Li , Zhinan Yang , Yi Zhang
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Abstract

The microstructure of bainitic steel was controlled through continuous cooling in the medium-temperature region. The influence of cooling rate on the microstructure and its effects on the strength and toughness of bainitic steel were investigated using transmission electron microscope (TEM), electron backscatter diffraction (EBSD), and X-ray diffraction (XRD). Experimental results indicate that as the cooling rate increases from 0.1 to 4 °C/s, the microstructure evolves from granular bainite to lath bainite, characterized by a high-density interface. At higher cooling rates, the samples exhibit enhanced strength and impact energy, attributed to dislocation strengthening and fine-grained strengthening mechanisms. Additionally, the presence of high-angle grain boundaries and filmy retained austenite within the microstructure contributes to improved toughness. Conversely, at a cooling rate of 0.1 °C/s, martensite/austenite(M/A) constituents and low-stability massive retained austenite do not favorably influence toughness improvement; however, increased retained austenite delays necking onset and promotes uniform plastic deformation. Combining in-situ phase transformation and tensile analysis, it is evident that phase transformations significantly affect tensile strain distribution. Specifically, temperature selection and the driving force for phase transformation influence the variation in size and orientation, thereby affecting strain distribution during tensile testing.
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来源期刊
Journal of Materials Research and Technology-Jmr&t
Journal of Materials Research and Technology-Jmr&t Materials Science-Metals and Alloys
CiteScore
8.80
自引率
9.40%
发文量
1877
审稿时长
35 days
期刊介绍: The Journal of Materials Research and Technology is a publication of ABM - Brazilian Metallurgical, Materials and Mining Association - and publishes four issues per year also with a free version online (www.jmrt.com.br). The journal provides an international medium for the publication of theoretical and experimental studies related to Metallurgy, Materials and Minerals research and technology. Appropriate submissions to the Journal of Materials Research and Technology should include scientific and/or engineering factors which affect processes and products in the Metallurgy, Materials and Mining areas.
期刊最新文献
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