Austenite formation during intercritical annealing in C-Mn cold-rolled dual phase steel

2015 ◽  
Vol 22 (4) ◽  
pp. 1203-1211 ◽  
Author(s):  
Sheng-ci Li ◽  
Yong-lin Kang ◽  
Guo-ming Zhu ◽  
Shuang Kuang
Keyword(s):  
Dual Phase Steel ◽  
Intercritical Annealing ◽  
Austenite Formation ◽  
Dual Phase ◽  
Cold Rolled

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

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.

Study of Texture in Ultra Fine Grained Dual Phase Steel Sheets

2011 ◽  
Vol 702-703 ◽  
pp. 806-809
Author(s):  
Papa Rao Mondi ◽  
R. Madhavan ◽  
V. Subramanya Sarma ◽  
S. Sankaran
Keyword(s):  
Cold Rolling ◽  
Dual Phase Steel ◽  
Intercritical Annealing ◽  
Rolling Direction ◽  
Dual Phase ◽  
Fine Grained ◽  
Steel Sheets ◽  
Cold Rolling And Annealing ◽  
Nb Microalloyed Steel ◽  
Cold Rolled

Severe cold rolling and short intercritcal annealing is often used to produce ultra-fine grained ferrite and martensite dual phase steels. In this paper, microstructure and texture of Nb-microalloyed steel following cold rolling and short intercritical annealing is investigated. The results show that cold rolling and annealing resulted in ultra-fine grained dual phase steel consisted of polygonal ferrite in the range of ~1-2 μm in size. In cold rolled material, the texture components are γ fiber (//normal direction) and α fiber (//rolling direction). Partial recrystallization texture was observed following intercritical annealing.

Fine-grained dual phase steel via intercritical annealing of cold-rolled martensite

Vacuum ◽  
2018 ◽  
Vol 155 ◽  
pp. 147-152 ◽  
Author(s):  
Mohammad Alibeyki ◽  
Hamed Mirzadeh ◽  
Mostafa Najafi
Keyword(s):  
Dual Phase Steel ◽  
Intercritical Annealing ◽  
Dual Phase ◽  
Fine Grained ◽  
Cold Rolled

scholarly journals Deformation and Recrystallization Textures in a C–Si–Mn–V Dual Phase Steel

1993 ◽  
Vol 21 (1) ◽  
pp. 39-53 ◽  
Author(s):  
D. K. Mondal ◽  
R. K. Ray
Keyword(s):  
Distribution Function ◽  
Orientation Distribution Function ◽  
Dual Phase Steel ◽  
Intercritical Annealing ◽  
Orientation Distribution ◽  
Dual Phase ◽  
Phase Structures ◽  
Cold Rolled ◽  
The Difference ◽  
Lower Temperature

Dual phase structures were produced in a C–Si–Mn–V steel from both ferrite-pearlite and martensitic structures by intercritical annealing at 750℃ and 810℃. Samples with different distributions of ferrite and martensite were cold rolled 60% and then recrystallized at 650℃ and 800℃ for different lengths of time. Texture measurements were carried out on the cold rolled as well as recrystallized materials using both the conventional pole-figure and ODF (Orientation Distribution Function) methods. The results indicated the presence of a reasonably strong 〈111〉 ∥ ND fibre in the cold deformed alloy. The textures in the recrystallized condition were found to be basically similar to the ones for the corresponding cold deformed materials, with the difference that the pole densities were somewhat weaker in the former. A weak {11,11,4} fibre and a weak and incomplete {337} fibre have also been observed in both the cold deformed and recrystallized materials. Samples recrystallized at the lower temperature of 650℃ exhibited a sharper {111} texture as compared to the 800℃ annealed materials and this difference in texture intensities were perceptibly reflected in the corresponding r-values.

scholarly journals Effect of Martensite Morphologies on Corrosion in 5% H2SO4 Solution of Borided X70 Dual Phase Steel

2021 ◽  
Vol 45 (1) ◽  
pp. 69-74
Author(s):  
Tassi Hocine ◽  
Zidelmel Sami ◽  
Allaoui Omar
Keyword(s):  
Corrosion Resistance ◽  
Dual Phase Steel ◽  
Annealing Temperature ◽  
Intercritical Annealing ◽  
Ferrite Matrix ◽  
Dual Phase ◽  
H2so4 Solution ◽  
Dp Steel ◽  
Direct Quenching ◽  
Step Quenching

In the present investigation, some electrochemical properties of dual phase X70 steels with different martensite morphologies which have undergone boriding were studied. To obtain a variety of martensite morphologies, Direct Quenching (DQ), Intermediate Quenching (IQ) and Step Quenching (SQ) heat treatments were applied at an intercritical annealing temperature (IAT) of 760℃. The treatment (DQ) allowed the formation of fine martensite evenly distributed in the ferrite matrix. (IQ) treatment showed the formation of martensite along the ferrite / ferrite grain boundaries. In contrast, treatment (SQ) induced the formation of a banded morphology of martensite and ferrite. The realization of borides on X70 (DP) steel was carried out in a powder mixture containing 5% of B4C as source of boron, 5% of NaBF4 as activator and 90% of SiC as diluent at 950℃ for a period of time from 4 h. The corrosion behavior of X70 (DP) steel has been explored by the Tafel extrapolation method in a 5 wt. % H2SO4 solution. The corrosion resistance of steel which has undergone boriding (BDP) is higher than that of steel which has not undergone it (DP).

scholarly journals Formability Analyses of a Novel Alloy Cold-rolled Batch Annealed Dual Phase Steel

2020 ◽  
Vol 47 ◽  
pp. 1211-1216
Author(s):  
Emin Tamer ◽  
Gulfem Ozgultekin ◽  
Okan Poyraz ◽  
Celal Seyalioglu
Keyword(s):  
Dual Phase Steel ◽  
Dual Phase ◽  
Cold Rolled
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