scholarly journals The influence of microstructure on hydrogen diffusion and embrittlement of fine-grained high strength dual-phase steels

2021 ◽  
Vol 59 (01) ◽  
pp. 69-78
Author(s):  
A. BEGIC HADZIPASIC ◽  
J. MALINA ◽  
M. MALINA
Keyword(s):  
Hydrogen Diffusion ◽  
High Strength ◽  
Dual Phase ◽  
Dual Phase Steels ◽  
Fine Grained

The limit drawing ratio and formability prediction of advanced high strength dual-phase steels

2011 ◽  
Vol 32 (6) ◽  
pp. 3320-3327 ◽  
Author(s):  
Wang Wu-rong ◽  
He Chang-wei ◽  
Zhao Zhong-hua ◽  
Wei Xi-cheng
Keyword(s):  
High Strength ◽  
Drawing Ratio ◽  
Dual Phase ◽  
Limit Drawing Ratio ◽  
Dual Phase Steels ◽  
Formability Prediction

Structure-properties relationship of ultra-fine grained V-microalloyed dual phase steels

2017 ◽  
Vol 703 ◽  
pp. 293-303 ◽  
Author(s):  
C.P. Scott ◽  
F. Fazeli ◽  
B. Shalchi Amirkhiz ◽  
I. Pushkareva ◽  
S.Y.P. Allain
Keyword(s):  
Dual Phase ◽  
Dual Phase Steels ◽  
Fine Grained ◽  
Relationship Of ◽  
Structure Properties

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.

scholarly journals Structure-properties relationship of ultra-fine grained V-microalloyed dual phase steels

2018 ◽  
Vol 24 (S1) ◽  
pp. 2232-2233
Author(s):  
Babak Shalchi Amirkhiz ◽  
Colin Scott ◽  
Fateh Fazeli
Keyword(s):  
Dual Phase ◽  
Dual Phase Steels ◽  
Fine Grained ◽  
Relationship Of ◽  
Structure Properties

scholarly journals Fatigue of Martensite-Ferrite High Strength Low-alloy Dual Phase Steels.

1999 ◽  
Vol 39 (8) ◽  
pp. 747-759 ◽  
Author(s):  
Z. G. Wang ◽  
S. H. Ai
Keyword(s):  
High Strength ◽  
Dual Phase ◽  
Dual Phase Steels

A novel approach to producing architectured ultra-high strength dual phase steels

2021 ◽  
pp. 142582
Author(s):  
Hamid Azizi ◽  
Javad Samei ◽  
Hatem S. Zurob ◽  
David S. Wilkinson ◽  
David Embury
Keyword(s):  
High Strength ◽  
Dual Phase ◽  
Dual Phase Steels ◽  
Novel Approach

DYNAMIC DEFORMATION AND FRACTURE BEHAVIOR OF ULTRA-FINE-GRAINED DUAL PHASE STEELS FABRICATED BY EQUAL CHANNEL ANGULAR PRESSING

2008 ◽  
Vol 22 (09n11) ◽  
pp. 1159-1164
Author(s):  
YANG GON KIM ◽  
BYOUNGCHUL HWANG ◽  
SUNGHAK LEE ◽  
DONG HYUK SHIN
Keyword(s):  
Equal Channel Angular Pressing ◽  
Fracture Behavior ◽  
Dynamic Deformation ◽  
Maximum Shear Stress ◽  
Annealed Specimen ◽  
Dual Phase ◽  
Dual Phase Steels ◽  
Fine Grained ◽  
Angular Pressing ◽  
Deformation And Fracture

In this study, dynamic deformation and fracture behavior of ultra-fine-grained dual phase steels fabricated by equal channel angular pressing (ECAP) was compared with that of conventionally annealed ultra-fine-grained steels. In the ECAPed conventionally annealed specimen, pearlites were decomposed, and the ferrite grain size increased up to 0.5 μm. The intercritically annealed specimen consisted of dual phases of equiaxed ferrites and blocky martensites (volume fraction; 35%, size; 1 μm). The dynamic torsional test results indicated that maximum shear stress of the annealed specimens was lower than that of the as-pressed specimen, but fracture shear strain was higher. These results suggested that annealing or promoting dual phase microstructures of the ECAPed specimens could be a good way to increase the fracture resistance under dynamic loading, as it reduced or prevented the formation of adiabatic shear bands or voids. In particular, the ECAPed ultra-fine-grained dual phase steel can be more reliably used under dynamic conditions since it overcomes the shortcomings of reduced strain hardenability, ductility, and dynamic properties.

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