Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 736, Issue -, Pages 148-155Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2018.08.092
Keywords
Ferritic steel; High strength; Ti-Nb-Mo complex microalloying; Precipitation; Strengthening mechanism
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Funding
- National Key R&D Program of China [2017YFB0305100]
- China Postdoctoral Science Foundation [2014M562072]
- Natural Science Foundation and Major Technology Innovation of Hubei Province [2017AAA113]
- State Key Laboratory Science Foundation for Youths [2016QN02]
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The effects of Nb on the microstructure and mechanical properties of Ti-Mo microalloyed high strength ferritic steel were systematically investigated. It was found that Nb addition inhibited the bainite transformation and was beneficial for obtaining ferritic steel. Further, Nb accelerated the precipitation in austenite and finer ferrite grains were obtained in Ti-Nb-Mo steel. The strengthening mechanism analysis results of experimental steels showed that the precipitation hardening effect of the (Ti, Mo, Nb)C particles was remarkable due to their larger volume fraction, although their average particle size was greater than that of (Ti, Mo)C in Ti-Mo steel. With the decrease of coiling temperature from 650 degrees C to 550 degrees C, the grain refinement strengthening and precipitation hardening of experimental steels increased. When the coiling temperature was 550 degrees C, the ferritic steel with superior mechanical properties was obtained by means of Ti-Nb-Mo complex microalloying. And the tensile strength, yield strength, and elongation of the Ti-Nb-Mo ferritic steel were 755 MPa, 712 MPa, and 22%, respectively.
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