Texture Development and Recrystallization Kinetics of a Cold Rolled Dual-Phase Steel Sheet

In this paper, double deformation test was conducted in a MMS-300 thermomechanical simulator. Austenite static recrystallization kinetics of ultra-high strength dual phase steel was investigated. The results have shown that the softening fractions increase with holding time as a whole. Under deformation temperatures of 950°C, 1000°C and 1050°C, the softening fractions increase with the increase of the deformation temperature. And the softening curve appears relatively flat under deformation temperatures of 950°C. The austenite no-recrystallization temperature (Tnr) of ultra-high strength dual phase steel was between 900°C and 950°C. Double deformation test conditions which promoted Nb(CN) precipitation resulted in a decrease of a austenite recrystallization. Strain induced precipitation of Nb (CN) was the main reason why the softening curve appeared a plateau.

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Optimizing Annealing Parameters with Gleeble simulation for Cold Rolled Continuous Annealed Dual Phase Steel Sheet

Materials Today Proceedings ◽

10.1016/j.matpr.2017.11.399 ◽

2018 ◽

Vol 5 (2) ◽

pp. 7303-7309 ◽

Cited By ~ 3

Author(s):

Rajan Kr Singh ◽

Madhawan Chandrawanshi ◽

R Sudharshan ◽

Devasish Mishra ◽

Ashish Chandra

Keyword(s):

Steel Sheet ◽

Dual Phase Steel ◽

Dual Phase ◽

Cold Rolled

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Effect of Intercritical Annealing Temperature on Development of Cold Rolled Dual Phase Steel from Q345 Steel

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.313-314.693 ◽

2013 ◽

Vol 313-314 ◽

pp. 693-696

Author(s):

Ji Yuan Liu ◽

Fu Xian Zhu ◽

Shi Cheng Ma

Keyword(s):

Dual Phase Steel ◽

Annealing Temperature ◽

Simulation Experiment ◽

Intercritical Annealing ◽

Continuous Annealing ◽

Dual Phase ◽

Automotive Applications ◽

Treatment Procedure ◽

Annealing Temperatures ◽

Cold Rolled

Cold rolled dual phase steel was developed from Q345 steel by heat treatment procedure for automotive applications. The ultimate tensile strength was improved about 100MPa higher than the traditional cold-rolled Q345 steel in the continuous annealing simulation experiment. The microstructure presented varied characteristics in different intercritical annealing temperatures; mechanical properties were changed correspondingly as well. The chief discussions are focus on the recrystallization, hardenability of austenite and martensite transformation in the experiment.

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Damage mechanism analysis of a high-strength dual-phase steel sheet with optimized fracture samples for various stress states and loading rates

Engineering Failure Analysis ◽

10.1016/j.engfailanal.2019.08.004 ◽

2019 ◽

Vol 106 ◽

pp. 104138 ◽

Cited By ~ 4

Author(s):

Wenqi Liu ◽

Junhe Lian ◽

Sebastian Münstermann

Keyword(s):

Steel Sheet ◽

Dual Phase Steel ◽

High Strength ◽

Damage Mechanism ◽

Dual Phase ◽

Mechanism Analysis ◽

Loading Rates ◽

Stress States

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Plastic and fracture behavior of a dual phase steel sheet under quasi-static and dynamic loadings

Engineering Fracture Mechanics ◽

10.1016/j.engfracmech.2020.107165 ◽

2020 ◽

Vol 235 ◽

pp. 107165 ◽

Cited By ~ 1

Author(s):

Valentin Davaze ◽

Nicolas Vallino ◽

Sylvia Feld-Payet ◽

Bertrand Langrand ◽

Jacques Besson

Keyword(s):

Fracture Behavior ◽

Steel Sheet ◽

Dual Phase Steel ◽

Dual Phase ◽

Dynamic Loadings

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Metallurgical Effects of Niobium in Dual Phase Steel

Metals ◽

10.3390/met10040504 ◽

2020 ◽

Vol 10 (4) ◽

pp. 504 ◽

Cited By ~ 3

Author(s):

Hardy Mohrbacher ◽

Jer-Ren Yang ◽

Yu-Wen Chen ◽

Johannes Rehrl ◽

Thomas Hebesberger

Keyword(s):

Dual Phase Steel ◽

Dual Phase ◽

Steel Matrix ◽

High Ductility ◽

Dp Steel ◽

Industrial Processing ◽

Automotive Body ◽

Niobium Microalloying ◽

Body Design ◽

Kinetics Of

Dual phase (DP) steels are widely applied in today’s automotive body design. The favorable combination of strength and ductility in such steels is in first place related to the share of ferrite and martensite. The pronounced work hardening behavior prevents localized thinning and allows excellent stretch forming. Niobium microalloying was originally introduced to dual phase steel for improving bendability by refining the microstructure. More recently developed “high ductility” (HD) DP steel variants provide increased drawability aided by a small share of austenite retained in the microstructure. In this variant niobium microalloying produces grain refinement and produces a dispersion of nanometer-sized carbide precipitates in the steel matrix which additionally contributes to strength. This study investigates the microstructural evolution and progress of niobium precipitation during industrial processing of high-ductility DP 980. The observations are interpreted considering the solubility and precipitation kinetics of niobium. The influences of niobium on microstructural characteristics and its contributions to strength and formability are discussed.

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