Influence of Nb on Microstructure and Property of Low-Carbon Mn-Series Air-Cooled Bainitic Steel

• Published in: Journal of iron and steel research, international international, 2010, Vol.17 (1), p.49-53
• Main Authors: WANG, Yong-wei, FENG, Chun, XU, Feng-yun, BAI, Bing-zhe, FANG, Hong-sheng
• Format: Article
• Language: English
• Subjects: Applied and Technical Physics; Bainitic steel; Engineering; Ferrites; Finishing; finishing rolling temperature; grain boundary allotriomorphic ferrite; Iron and steel industry; Machines; Manganese; Manufacturing; Materials Engineering; Materials Science; Metallic Materials; Microstructure; Mn-series bainitic steel; Nb microalloyed steel; Niobium; Physical Chemistry; Processes; Steels; toughness; 含铌钢; 组织演变; 贝氏体; 透射电镜观察; 钢性能
• ISSN: 1006-706X; 2210-3988
• DOI: 10.1016/S1006-706X(10)60044-1

The effect of Nb on the microstructure evolution of low-carbon Mn-series air cooled bainitic steels has been studied by using thermomechanical simulation machine, SEM, and TEM observation. The results show that the amount of ferrites is relatively higher in the steel without Nb than that of Nb-bearing steel under same deformation conditions, and the ferrites in Nb-bearing steel are more finer. The mechanical properties of the Nb-bearing steel are higher than those of the steel without Nb at the same finishing rolling temperature (FRT), and the toughness of the Nb-bearing steel is about 100 J higher than that of the steel without Nb at the finishing rolling temperature 750 °C. The toughness of Nb microalloyed steel will be improved more effectively than that of the steel without Nb with the decrease of FRT.