Effect of Reheating and End Cooling Temperature on Microstructure Refinement in a Low Carbon High Strength Nb-Ti Microalloyed Dual Phase Steel

L.D. Yao; Z.G. Li; Xing Feng Mao; Xue Li Tao; Kai Ming Wu

doi:10.4028/www.scientific.net/MSF.561-565.49

Paper Titles

Effect of Initial Grain Size on the Dynamic Recrystallization Behaviours of Austenite
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Microstructure and Mechanical Properties of Ni-Free High Nitrogen Austenite Stainless Steels Fabricated by Mechanical Alloying Method
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Enhancement of Fatigue Strength of SAE 1045 Steel by Tempering Treatment and Shot Peening
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Effect of Lower Final Rolling Temperature on Mechanical Properties of V-N Microalloyed Mild Steel
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Effect of Reheating and End Cooling Temperature on Microstructure Refinement in a Low Carbon High Strength Nb-Ti Microalloyed Dual Phase Steel
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The Comparative Effectiveness of Nb Solute and NbC Precipitates at Impeding Grain Boundary Motion in Nb-Steels
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Microstructural Features of a Ultra Low Carbon High Strength Acicular Ferrite Steel Thick Plate
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The Study of Inner Surface Crack Formation of Seamless Modified 9Cr-1Mo Tube Rolled on Mandrel Mill and Its Application
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The Nanohardness of Acicular Ferrite and Bainitic Ferrite in Low Carbon Microalloying Steel
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HomeMaterials Science ForumMaterials Science Forum Vols. 561-565Effect of Reheating and End Cooling Temperature on...

Effect of Reheating and End Cooling Temperature on Microstructure Refinement in a Low Carbon High Strength Nb-Ti Microalloyed Dual Phase Steel

Abstract:

In this study, a TMCP was attempted to obtain a low carbon high strength Nb-Ti microalloyed dual phase with low yield ratio at Baosteel. Optical and scanning electron microscopy was utilized to analyze microstructures. A mixed fine microstructures consisting of acicular ferrite and martensite/austenite was observed. The austenite maintained a small grain size during reheating in the temperatures ranging from 1100°C to 1250°C. The growth of austenite was strongly retarded by Nb and Ti nitride and carbide. The higher end cooling temperature (650°C) had much influence on the refinement of microstructures, especially the length of ferrite packets, whereas the lower temperatures (600-500°C) had little effect on the microstructure refinement.

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Materials Science Forum (Volumes 561-565)

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49-52

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.561-565.49

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Online since:

October 2007

Authors:

L.D. Yao, Z.G. Li, Xing Feng Mao, Xue Li Tao, Kai Ming Wu

Keywords:

Acicular Ferrite, Dual Phase Steel, Microstructural Refinement, Steel

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[20] [40] [60] [80] 100 450 500 550 600 650 700 Length Width End cooling temperature, °C Packet length and width, µm Fig. 3 Relationship of ferrite packet length Fig. 4 Relationship of individual ferrite packet and width with end cooling temperature length and width with end cooling temperature.

DOI: 10.7717/peerj.10976/supp-9

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