The Influence of Volume Fraction of Martensite and Ferrite Grain Size on Ultimate Tensile Strength and Maximum Uniform True Strain of Dual Phase Steel

2016 ◽  
Vol 69 (8) ◽  
pp. 1605-1612 ◽  
Author(s):  
S. A. Etesami ◽  
M. H. Enayati ◽  
A. Taherizadeh ◽  
B. Sadeghian
Keyword(s):  
Grain Size ◽  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Dual Phase Steel ◽  
Volume Fraction ◽  
True Strain ◽  
Dual Phase ◽  
Ferrite Grain Size

scholarly journals Fracture Mechanisms in Dual-Phase Steel: Influence of Martensite Volume Fraction and Ferrite Grain Size

2018 ◽  
Vol 11 (6) ◽  
pp. 174-181 ◽  
Author(s):  
D. Avendaño-Rodríguez ◽  
◽  
J. D. Granados ◽  
E. Espejo-Mora ◽  
L. Mujica-Roncery ◽  
...  
Keyword(s):  
Grain Size ◽  
Dual Phase Steel ◽  
Volume Fraction ◽  
Fracture Mechanisms ◽  
Dual Phase ◽  
Martensite Volume Fraction ◽  
Ferrite Grain Size

scholarly journals Fracture Mechanisms in Dual-Phase Steel: Influence of Martensite Volume Fraction and Ferrite Grain Size

2018 ◽  
Vol 11 (6) ◽  
pp. 174-181 ◽  
Author(s):  
D. Avendaño-Rodríguez ◽  
◽  
J. D. Granados ◽  
E. Espejo-Mora ◽  
L. Mujica-Roncery ◽  
...  
Keyword(s):  
Grain Size ◽  
Dual Phase Steel ◽  
Volume Fraction ◽  
Fracture Mechanisms ◽  
Dual Phase ◽  
Martensite Volume Fraction ◽  
Ferrite Grain Size

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.

Effect of Austenite on Drawing Limit of Ferrite-Austenite Dual Phase Wire

2010 ◽  
Vol 654-656 ◽  
pp. 78-81 ◽  
Author(s):  
Seung Hyun Lee ◽  
Hu Chul Lee
Keyword(s):  
Heat Treatment ◽  
Tensile Strength ◽  
Mechanical Stability ◽  
Volume Fraction ◽  
Void Nucleation ◽  
True Strain ◽  
Nucleation Site ◽  
Dual Phase ◽  
Number Density ◽  
Intermediate Heat Treatment

The drawability of ferrite-austenite dual phase wires decreased with increasing volume fraction and decreasing mechanical stability of austenite. The interface of the martensite and ferrite was identified as the void nucleation site and the number density of voids increased with increasing austenite volume fraction. The plastic incompatibility at the interface was assumed to be the main reason for void nucleation. The ferrite-austenite dual phase steels could be drawn to a maximum true strain of 8.0 without intermediate heat treatment. The tensile strength of the drawn wires increased with increasing volume fraction of austenite or, in other words, with increasing volume fraction of transformed martensite.

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

2015 ◽  
Vol 808 ◽  
pp. 28-33 ◽  
Author(s):  
Constantin Dulucheanu ◽  
Nicolai Bancescu ◽  
Traian Severin
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Dual Phase Steel ◽  
Volume Fraction ◽  
Total Elongation ◽  
Metallographic Analysis ◽  
Dual Phase ◽  
Quenching Temperature ◽  
Offset Yield Strength ◽  
Martensite Structure

In this article, the authors have analysed the influence of quenching temperature (TQ) on the mechanical properties of a dual-phase steel with 0.094 % C and 0.53% Mn. In order to obtain a ferrite-martensite structure, specimens of this material have been the subjected to intercritical quenching that consisted of heating at 750, 770, 790, 810 and 830 °C, maintaining for 30 minutes and cooling in water. These specimens have then been subjected to metallographic analysis and tensile test in order to determine the volume fraction of martensite (VM) in the structure, ultimate tensile strength (Rm), the 0.2% offset yield strength (Rp0.2), the total elongation (A5) and the Rp0.2/Rm ratio.

scholarly journals Effect of True Strains in Isothermal abc Pressing on Mechanical Properties of Ti49.8Ni50.2 Alloy

Metals ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1313
Author(s):  
Oleg Kashin ◽  
Konstantin Krukovskii ◽  
Aleksandr Lotkov ◽  
Victor Grishkov
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
True Strain ◽  
Main Idea ◽  
Strain Curve ◽  
Subgrain Structure ◽  
Average Grain Size ◽  
Abc Pressing

The paper analyzes the microstructure and mechanical properties of Ti49.8Ni50.2 alloy (at.%) under uniaxial tension at room temperature after isothermal abc pressing to true strains e = 0.29 − 8.44 at T = 723 K. The analysis shows that as the true strain e is increased, the grain–subgrain structure of the alloy is gradually refined. This leads to an increase in its yield stress σy and strain hardening coefficient θ = dσ/dε at linear stage III of its tensile stress–strain curve according to the Hall–Petch relation. However, the ultimate tensile strength remains invariant to such refinement. The possible mechanism is proposed to explain why the ultimate tensile strength can remain invariant to the average grains size (dav). It is assumed that the sharp increase of the ultimate tensile strength σUTS begins when (dav) is less than the critical average grain size (dav)cr. In our opinion, for the investigated alloy (dav)cr ≈ 0.5 µm. In our study, the attained average grain size is larger the critical one. The main idea of the mechanism is next. In alloys with an average grain size (dav) less than the critical one, a higher external stress is required for the nucleation and propagation of the main crack.

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