材料科学
贝氏体
冶金
碳化物
微观结构
铁氧体(磁铁)
奥氏体
合金
极限抗拉强度
延展性(地球科学)
合金钢
铸造
复合材料
蠕动
作者
Sk. Md. Hasan,Mainak Ghosh,Debalay Chakrabarti,Shiv Brat Singh
标识
DOI:10.1016/j.msea.2019.138590
摘要
In the present work, attempts have been made to design and develop low-carbon, low-alloy, high strength carbide-free bainitic steels for application in heavy-haul rail tracks. The study starts with an analytical approach for understanding the effects of different alloying elements on the thermodynamic and kinetic aspects of bainite transformation and the resultant microstructure and mechanical properties. Based on the analysis, two steel compositions were designed for further investigation. The alloys were prepared by melting and casting and processed by hot-rolling and air cooling, which is the usual route for the industrial production of rail sections. Microstructures of the developed steels primarily consisted of plates of carbide-free bainitic ferrite, interspersed with fine films of retained austenite. These continuously cooled steels offer ultra-high strength levels with very good ductility which are far superior to existing pearlitic grade rail steels. Detailed characterization and quantification of microstructural constituents have been carried out and they are correlated with the tensile proprieties using semi-empirical formulations available in literature.
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