Effect of Nb on the Microstructure and Properties of Cold Rolled and Annealed Mo Microalloyed Bainitic Steel |
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| Authors: | Yi Zhang Guang Xu Li Wang Yaowen Xu and Zhengliang Xue |
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| Affiliation: | Research Institute of Architectural Design, South China University of Technology, Guangzhou 510640, China and Research Institute of Architectural Design, South China University of Technology, Guangzhou 510640, China |
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| Abstract: | Two kinds of low carbon bainitic steels, Nb-free Mo bearing and Nb + Mo addition steels, were cold rolled and annealed to investigate the effect of micro-alloying element Nb on the microstructure and properties of Mo microalloyed low carbon high strength bainitic steel. No precipitates were observed in Nb-free Mo bearing steel, whereas, two types of precipitates, i.e., Nb(C, N) and composite (Nb, Mo)(C, N), were observed in the Nb + Mo microalloyed steel, resulting in precipitation strengthening. The strength of Mo bearing steel was improved by addition of Nb under the same annealing conditions. The grain size of Nb addition steel was almost the same as Nb-free steel. Unlike the obvious grain refinement and precipitation strengthening in hot rolling, the increase in yield strength of Nb addition steels in cold rolling and annealing mainly results from the precipitation strengthening, while the effect of grain refinement strengthening can be almost ignored. |
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| Keywords: | pedestrian-vehicle division multi-dimensions pedestrian system campus |
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