The High Nb Content Microalloying Approach for Developing High Performance Structural Steel

Abstract:

Two kinds of ULCB steel were designed with different Nb content. The yield strength of the steel which was made by adding 0.09%Nb, TMCP (Thermo Mechanical Controlling Processing) and tempering can achieve more than 900MPa. As compared with 0.05%Nb steel, adding 0.09%Nb can refine the austenite grain significantly. Through the analysis by TEM and EDX, a large amount of Nb precipitation particles can be observed in the steel with 0.09% Nb tempered at 650°C for 1h and these particles are generally small than 20nm.

• Periodical: Materials Science Forum (Volumes 638-642)
• Pages: 3508-3513
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.638-642.3508
• Online since: January 2010
• Authors: Xiu Cheng Li, Cheng Jia Shang, Dian Xiu Xia, Xin Lai He
• Keywords: High Nb, Precipitation, Prior Austenite Grain, Tempering, ULCB

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