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Supervised by Ministry of Industry and Information Technology of The People's Republic of China Sponsored by Harbin Institute of Technology Editor-in-chief Yu Zhou ISSNISSN 1005-9113 CNCN 23-1378/T

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Related citation:Yi Zhang,Guang Xu,Li Wang,Yaowen Xu,Zhengliang Xue.Effect of Nb on the Microstructure and Properties of Cold Rolled and Annealed Mo Microalloyed Bainitic Steel[J].Journal of Harbin Institute Of Technology(New Series),2016,23(4):52-58.DOI:10.11916/j.issn.1005-9113.2016.04.008.
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Effect of Nb on the Microstructure and Properties of Cold Rolled and Annealed Mo Microalloyed Bainitic Steel
Author NameAffiliation
Yi Zhang Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Hubei Collaborative Innovation Center for Advanced Steels, Wuhan University of Science and Technology, Wuhan 430081, China
State Key Laboratory of Development and Application Technology of Automotive Steels Baosteel Group,Shanghai 201900,China 
Guang Xu Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Hubei Collaborative Innovation Center for Advanced Steels, Wuhan University of Science and Technology, Wuhan 430081, China
State Key Laboratory of Development and Application Technology of Automotive Steels Baosteel Group,Shanghai 201900,China 
Li Wang State Key Laboratory of Development and Application Technology of Automotive Steels Baosteel Group,Shanghai 201900,China 
Yaowen Xu Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Hubei Collaborative Innovation Center for Advanced Steels, Wuhan University of Science and Technology, Wuhan 430081, China 
Zhengliang Xue Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Hubei Collaborative Innovation Center for Advanced Steels, Wuhan University of Science and Technology, Wuhan 430081, China 
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.
Key words:  recrystallization annealing  low carbon bainitic steel  Nb  Mo  cold rolling
DOI:10.11916/j.issn.1005-9113.2016.04.008
Clc Number:TG113.11, TG156.1
Fund:

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