Effects of Cooling Rate on Microstructure and Properties of Nb-Ti Micro-Alloyed Steel

Xin Li; Jie Zhao; Xun Yang; Jun Cheng Bao; Bao Qun Ning

doi:10.4028/www.scientific.net/AMM.341-342.208

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 341-342Effects of Cooling Rate on Microstructure and...

Effects of Cooling Rate on Microstructure and Properties of Nb-Ti Micro-Alloyed Steel

Abstract:

Continuous cooling transformation (CCT) curves of deformed austenite (A) of Nb-Ti microalloying high strength steel were measured using Gleeble-3800 thermo-mechanical simulator, and corresponding transformation and structure were analyzed, and the effects of cooling rate on the tested steels mechanical property were studied. The resultes showed that the Ar₃ transformation point decreased with increasing cooling rate after hot-rolling. The morphology of ferrite (F) grains changed from polygonal to lath, and the pearlite (P) colonies became more fine with increasing cooling rate. The quantity of ferrite and pearlite decreased, and the quantity of bainite (B) and martensite (M) increased. Then the hardness of Nb-Ti micro-alloyed steel is increased along with the increasing cooling rate, which may owing to the reasons that the hardness of ferrite and pearlite is far smaller than that of bainite and martensite, and the grain refinement causes the hardness increasing.

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Periodical:

Applied Mechanics and Materials (Volumes 341-342)

Pages:

208-212

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.341-342.208

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Online since:

July 2013

Authors:

Xin Li, Jie Zhao, Xun Yang, Jun Cheng Bao, Bao Qun Ning

Keywords:

CCT Curves, Microhardness, Microstructure, Nb-Ti Micro-Alloyed Steel, Phase Transformation

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