scholarly journals A Dislocation-Based Theory for the Deformation Hardening Behavior of DP Steels: Impact of Martensite Content and Ferrite Grain Size

2010 ◽  
Vol 2010 ◽  
pp. 1-16 ◽  
Author(s):  
Yngve Bergström ◽  
Ylva Granbom ◽  
Dirk Sterkenburg
Keyword(s):  
Plastic Deformation ◽  
Grain Size ◽  
Deformation Process ◽  
Volume Fraction ◽  
High Energy ◽  
Martensite Content ◽  
Plastic Deformation Process ◽  
Deformation Hardening ◽  
Dp Steels ◽  
Ferrite Grain Size

A dislocation model, accurately describing the uniaxial plastic stress-strain behavior of dual phase (DP) steels, is proposed and the impact of martensite content and ferrite grain size in four commercially produced DP steels is analyzed. It is assumed that the plastic deformation process is localized to the ferrite. This is taken into account by introducing a nonhomogeneity parameter, f(ε), that specifies the volume fraction of ferrite taking active part in the plastic deformation process. It is found that the larger the martensite content the smaller the initial volume fraction of active ferrite which yields a higher initial deformation hardening rate. This explains the high energy absorbing capacity of DP steels with high volume fractions of martensite. Further, the effect of ferrite grain size strengthening in DP steels is important. The flow stress grain size sensitivity for DP steels is observed to be 7 times larger than that for single phase ferrite.

Determining the minimum grain size in severe plastic deformation process via first-principles calculations

2012 ◽  
Vol 60 (11) ◽  
pp. 4506-4513 ◽  
Author(s):  
Song Lu ◽  
Qing-Miao Hu ◽  
Erna Krisztina Delczeg-Czirjak ◽  
Börje Johansson ◽  
Levente Vitos
Keyword(s):  
Plastic Deformation ◽  
Grain Size ◽  
Severe Plastic Deformation ◽  
First Principles ◽  
Deformation Process ◽  
First Principles Calculations ◽  
Severe Plastic Deformation Process ◽  
Plastic Deformation Process

Effect of Tailoring Martensite Shape and Spatial Distribution on Tensile Deformation Characteristics of Dual Phase Steels

2017 ◽  
Vol 140 (2) ◽  
Author(s):  
B. Ravi Kumar ◽  
Vishal Singh ◽  
Tarun Nanda ◽  
Manashi Adhikary ◽  
Nimai Halder ◽  
...  
Keyword(s):  
Grain Size ◽  
Spatial Distribution ◽  
Volume Fraction ◽  
Tensile Deformation ◽  
Void Formation ◽  
Martensite Phase ◽  
Continuous Annealing ◽  
Dual Phase ◽  
Deformation Characteristics ◽  
Dp Steels

The authors simulated the industrially used continuous annealing conditions to process dual phase (DP) steels by using a custom designed annealing simulator. Sixty-seven percentage of cold rolled steel sheets was subjected to different processing routes, including the conventional continuous annealing line (CAL), intercritical annealing (ICA), and thermal cycling (TC), to investigate the effect of change in volume fraction, shape, and spatial distribution of martensite on tensile deformation characteristics of DP steels. Annealing parameters were derived using commercial software, including thermo-calc, jmat-pro, and dictra. Through selection of appropriate process parameters, the authors found out possibilities of significantly altering the volume fraction, morphology, and grain size distribution of martensite phase. These constituent variations showed a strong influence on tensile properties of DP steels. It was observed that TC route modified the martensite morphology from the typical lath type to in-grain globular/oblong type and significantly reduced the martensite grain size. This route improved the strength–ductility combination from 590 MPa–33% (obtained through CAL route) to 660 MPa–30%. Finally, the underlying mechanisms of crack initiation/void formation, etc., in different DP microstructures were discussed.

Influence of Compressive Torsion Processing Temperature on Microstructure Refinement and Property of Aluminum Alloy

2007 ◽  
Vol 26-28 ◽  
pp. 133-136 ◽  
Author(s):  
Shotaro Tahara ◽  
Yuji Kume ◽  
Makoto Kobashi ◽  
Naoyuki Kanetake
Keyword(s):  
Plastic Deformation ◽  
Deformation Process ◽  
Large Strain ◽  
Tensile Elongation ◽  
Total Elongation ◽  
Work Piece ◽  
Processing Temperature ◽  
Microstructure Refinement ◽  
Plastic Deformation Process ◽  
Eutectic Si

A compressive torsion processing (CTP) was applied to hypereutectic Al-Si alloy in order to raise ductility and formability by microstructure refinement of the alloy. The CTP is a unique severe plastic deformation process and it can easily apply large strain to a work piece without change in shape. In the present work, influence of compressive torsion processing temperature on microstructure refinement and tensile property of hypereutectic Al-Si alloy is dealt with. When the CTP was applied on the Al-Si alloy, primary and eutectic Si particles were refined more effectively at lower processing temperature. Total tensile elongation of CTPed alloy was four times as large as that of non CTPed one. Distribution of the total elongation was quite uniform in the whole CTPed specimen.

scholarly journals Deformation of Second Phase Particles in Al Alloy Using Severe Plastic Deformation Process

Materia Japan ◽  
2003 ◽  
Vol 42 (12) ◽  
pp. 863-863 ◽  
Author(s):  
Keiichiro Ohishi ◽  
Takeshi Fujita ◽  
Kunihiro Ohashi ◽  
Kenji Kaneko ◽  
Zenji Horita
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Deformation Process ◽  
Al Alloy ◽  
Second Phase ◽  
Severe Plastic Deformation Process ◽  
Plastic Deformation Process ◽  
Second Phase Particles

THEORETICAL AND PRACTICAL BASIS OF ROLLED PRODUCTS

2021 ◽  
Vol 2 (1) ◽  
pp. 55-60
Author(s):  
Bahodir Qurbanovich Tilabov ◽  
◽  
Saidabbos Ikromovich Isaev ◽  
Jamshid Abdurazzokovich Sherbo’taev ◽  
Ikhtiyor Chorievich Zhurakulov
Keyword(s):  
Plastic Deformation ◽  
Deformation Process ◽  
Rolled Steel ◽  
Plastic Deformation Process ◽  
Hardening Treatment ◽  
Microstructure Parameters ◽  
Metal Products ◽  
Steel Hardening ◽  
Hardening Heat Treatment

The article presents the theoretical and practical basis for the production of rolled products in the conditions of a metallurgical plant. The processes of plastic deformation of bodies between rotating drive rolls are shown. The main results of research on rolled products made of rolled steel are presented. The chemical composition, mechanical properties, macro -and microstructure parameters, and strengthening treatments of locally produced rolled steel were studied. It is shown that after hardening treatment, the strength increases and the quality of rolled products improves.Keywords:composition and properties of rolled metal products, plastic deformation process, rotating drive rollers, rolled body, rolled steel, hardening heat treatment, hardness, macro-and microstructure, performance and quality of finished products

Micromechanical Simulation Approach of Dual Phase Steel Artificial Microstructure Using Random Field Model

2021 ◽  
Vol 1016 ◽  
pp. 534-540
Author(s):  
Mohamed Imad Eddine Heddar ◽  
Nadjoua Matougui ◽  
Brahim Mehdi
Keyword(s):  
Grain Size ◽  
Random Field ◽  
Dual Phase Steel ◽  
Field Model ◽  
Volume Fraction ◽  
Gaussian Kernel ◽  
Dual Phase ◽  
Strain Behavior ◽  
Proportional Relationship ◽  
Dp Steels

In this study, a random field (RF) model with a Gaussian kernel was applied to generate an artificial microstructure of dual phase (DP) steels. Micrographs obtained from Scanning Electron Microscopy (SEM) were analyzed using image processing software to extract the grain size and the volume fraction of each phase. Based on watershed (Ws) segmentation and quantitative analysis, the real and artificial microstructures were compared by analyzing grain features related the solidity, grain size and aspect ratio (the proportional relationship between its width and its height). Consequently, this approach allows to simulate the overall stress-strain behavior of the analyzed microstructures. As a result, it was shown that the strain localization starts to develop at the ferrite/martensite interface and that the RF model could replicate the micromechanical behavior of DP steels.

Microstructure-strength relationship of ultrafine-grained titanium manufactured by unconventional severe plastic deformation process

2020 ◽  
Vol 837 ◽  
pp. 155576 ◽  
Author(s):  
Daniel Wojtas ◽  
Krzysztof Wierzbanowski ◽  
Robert Chulist ◽  
Wacek Pachla ◽  
Magdalena Bieda-Niemiec ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Deformation Process ◽  
Severe Plastic Deformation Process ◽  
Plastic Deformation Process ◽  
Ultrafine Grained ◽  
Relationship Of ◽  
Strength Relationship
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