Determination of local carbon content in austenite during intercritical annealing of dual phase steels by PEELS analysis

2007 ◽  
Vol 57 (2) ◽  
pp. 89-92 ◽  
Author(s):  
A. García-Junceda ◽  
F.G. Caballero ◽  
C. Capdevila ◽  
C. García de Andrés
Keyword(s):  
Carbon Content ◽  
Intercritical Annealing ◽  
Dual Phase ◽  
Dual Phase Steels

The effect of carbon content on fatigue strength of dual-phase steels

2007 ◽  
Vol 28 (6) ◽  
pp. 1827-1835 ◽  
Author(s):  
M. Tayanç ◽  
A. Aytaç ◽  
A. Bayram
Keyword(s):  
Fatigue Strength ◽  
Carbon Content ◽  
Dual Phase ◽  
Dual Phase Steels

Formation of Austenite During Intercritical Annealing of Dual-Phase Steels

1981 ◽  
Vol 12 (8) ◽  
pp. 1419-1428 ◽  
Author(s):  
G. R. Speich ◽  
V. A. Demarest ◽  
R. L. Miller
Keyword(s):  
Intercritical Annealing ◽  
Dual Phase ◽  
Dual Phase Steels

scholarly journals A Unified Model for Plasticity in Ferritic, Martensitic and Dual-Phase Steels

Metals ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 764
Author(s):  
Shuntaro Matsuyama ◽  
Enrique I. Galindo-Nava
Keyword(s):  
Grain Size ◽  
Dislocation Density ◽  
Carbon Content ◽  
Grain Boundaries ◽  
Uniform Elongation ◽  
High Strength Steels ◽  
High Strength ◽  
Dual Phase ◽  
Dual Phase Steels ◽  
Dislocation Generation

Unified equations for the relationships among dislocation density, carbon content and grain size in ferritic, martensitic and dual-phase steels are presented. Advanced high-strength steels have been developed to meet targets of improved strength and formability in the automotive industry, where combined properties are achieved by tailoring complex microstructures. Specifically, in dual-phase (DP) steels, martensite with high strength and poor ductility reinforces steel, whereas ferrite with high ductility and low strength maintains steel’s formability. To further optimise DP steel’s performance, detailed understanding is required of how carbon content and initial microstructure affect deformation and damage in multi-phase alloys. Therefore, we derive modified versions of the Kocks–Mecking model describing the evolution of the dislocation density. The coefficient controlling dislocation generation is obtained by estimating the strain increments produced by dislocations pinning at other dislocations, solute atoms and grain boundaries; such increments are obtained by comparing the energy required to form dislocation dipoles, Cottrell atmospheres and pile-ups at grain boundaries, respectively, against the energy required for a dislocation to form and glide. Further analysis is made on how thermal activation affects the efficiency of different obstacles to pin dislocations to obtain the dislocation recovery rate. The results are validated against ferritic, martensitic and dual-phase steels showing good accuracy. The outputs are then employed to suggest optimal carbon and grain size combinations in ferrite and martensite to achieve highest uniform elongation in single- and dual-phase steels. The models are also combined with finite-element simulations to understand the effect of microstructure and composition on plastic localisation at the ferrite/martensite interface to design microstructures in dual-phase steels for improved ductility.

Ultrafine Grained Dual Phase Steels Fabricated by Equal Channel Angular Pressing

2006 ◽  
Vol 503-504 ◽  
pp. 447-454 ◽  
Author(s):  
Dong Hyuk Shin ◽  
Woo Gyeom Kim ◽  
Jung Yong Ahn ◽  
Kyung Tae Park ◽  
Yong Suk Kim
Keyword(s):  
Strain Hardening ◽  
Equal Channel Angular Pressing ◽  
Room Temperature ◽  
Intercritical Annealing ◽  
Total Elongation ◽  
Coarse Grained ◽  
Dual Phase ◽  
Dual Phase Steels ◽  
Angular Pressing ◽  
Ultrafine Grained

Ultrafine grained (UFG) ferrite-martensite dual phase steels were fabricated by equal channel angular pressing and subsequent intercritical annealing. Their room temperature tensile properties were examined and compared to those of coarse grained counterpart. The formation of UFG martensite islands of ~ 1 μm was not confined to the former pearlite colonies but they were uniformly distributed throughout UFG matrix. The strength of UFG dual phase steels was much higher than that of coarse grained counterpart but uniform and total elongation were not degraded. More importantly, unlike most UFG metals showing negligible strain hardening, the present UFG dual phase steels exhibited extensive rapid strain hardening.

Segregation of manganese during intercritical annealing of dual phase steels

1984 ◽  
Vol 15 (7) ◽  
pp. 1499-1502 ◽  
Author(s):  
N. Pussegoda ◽  
W. R. Tyson ◽  
P. Wycliffe ◽  
G. R. Purdy
Keyword(s):  
Intercritical Annealing ◽  
Dual Phase ◽  
Dual Phase Steels

Growth of Austenite in the Intercritical Annealing of Fe-C-Mn Dual Phase Steels

1981 ◽  
Vol 20 (3) ◽  
pp. 339-350 ◽  
Author(s):  
P. A. Wycliffe ◽  
G. R. Purdy ◽  
J. D. Embury
Keyword(s):  
Intercritical Annealing ◽  
Dual Phase ◽  
Dual Phase Steels

The Influence of Quenching Temperature on the Structure of a Dual-Phase Steel with 0.094% C and 0.53% Mn

2015 ◽  
Vol 809-810 ◽  
pp. 507-512 ◽  
Author(s):  
Constantin Dulucheanu ◽  
Nicolai Bancescu ◽  
Traian Severin
Keyword(s):  
Carbon Content ◽  
Dual Phase Steel ◽  
Volume Fraction ◽  
Manganese Content ◽  
Heat Treatments ◽  
Metallographic Analysis ◽  
Dual Phase ◽  
Low Carbon ◽  
Dual Phase Steels ◽  
Quenching Temperature

In this article, the authors have analysed the influence of quenching temperature (TQ) on the microstructure of a dual-phase steel with a low carbon and manganese content (0,094 % C and 0,53 % Mn). The ferrite-martensite structures, typical of the dual-phase steels, has been obtained by intercritical quenching that consisted of heating at temperatures (TQ) ranging between 750 °C and 830 °C, maintaining for 30 minutes and cooling in water. After carrying out intercritical heat treatments, samples have been subjected to metallographic analysis through which the volume fraction of martensite (VM), the volume fraction of ferrite (VF), the carbon content of the martensite (CM), the morphology and distribution of these phases have been determined, and then, the influence of quenching temperature (TQ) has been established.

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