Journal
MATERIALS & DESIGN
Volume 84, Issue -, Pages 95-99Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2015.06.133
Keywords
Bainitic steel; Bainitic transformation; Microstructure; Property
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Funding
- National Natural Science Foundation of China (NSFC) [51274154]
- National High Technology Research and Development Program of China [2012AA03A504]
- State Key Laboratory of Development and Application Technology of Automotive Steels (Baosteel Group) [BS2012-01]
- Key Project of Hubei Education Committee [20121101]
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Four low carbon bainite steels were designed to investigate the effects of Mo and Nb addition on bainitic transformation, microstructures and properties by metallographic method and dilatometry. The results show that single Nb addition retards bainitic transformation in low carbon bainite steels, although it can improve strength by refining microstructures. Moreover, Mo addition is effective to improve the strength of low carbon bainite steel by promoting bainitic transformation and single Mo addition has a better strengthening effect than single Nb addition. Further, in Mo bearing steel, Nb addition refines bainite sheaves, but meanwhile hinders bainitic transformation because of smaller austenite grains. Consequently, the composite strengthening effect of Mo and Nb addition has little improvement compared with individual addition of Mo in low carbon bainite steels. (C) 2015 Elsevier Ltd. All rights reserved.
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