Effect of Nb on microstructure and mechanical properties of  hot-rolled low-carbon bainitic steel

doi:10.13251/j.issn.0254-6051.2020.06.041

Abstract

Abstract: Two kinds of steels based on C-Si-Mn system were designed in order to develop the 600 MPa grade hot-rolled bainitic steel, one was Nb-added, and another as the base steel without Nb addition. Microstructure observation, precipitation analysis and tensile test were conducted to investigate the effect of Nb on microstructure and mechanical properties of the hot-rolled low-carbon bainitic steel after melting and rolling. The results reveal that the bainitic lath is refined by the 0.025wt% Nb addition, and the strength and ductility of the steel are apparently increased. In addition, the dispersed carbonitride particles containing Nb provide the precipitation strengthening effect on the steel. It is concluded that the Nb addition improves the comprehensive performance of the low-carbon high-strength bainitic steel.

Key words: hot-rolled bainitic steel, niobium, microstructure, mechanical properties

CLC Number:

TG142.1

Dong Changfu, Yuan Qing, Xu Guang, Hu Da. Effect of Nb on microstructure and mechanical properties of hot-rolled low-carbon bainitic steel[J]. Heat Treatment of Metals, 2020, 45(6): 197-200.

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Effect of Nb on microstructure and mechanical properties of hot-rolled low-carbon bainitic steel

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