scholarly journals Effect of Carbon Content on Annealing Texture, Plastic Anisotropy, and Mechanical Properties of 0.07% Phosphorus Sheet Steels

1979 ◽  
Vol 3 (4) ◽  
pp. 215-230 ◽  
Author(s):  
Hsun Hu
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Carbon Content ◽  
Detrimental Effect ◽  
Plastic Anisotropy ◽  
Sheet Steels ◽  
Annealing Texture ◽  
Cold Rolled ◽  
Anisotropy Strength ◽  
Subcritical Temperature

The effects of carbon content on the crystallographic texture, plastic anisotropy, and mechanical properties of cold-rolled and annealed sheets of 0.07 percent phosphorus steels have been studied. Both vacuumand air-melted laboratory heats were used. Results show that although the strength of the sheet increased with increasing carbon content, the rm value decreased. The detrimental effect of carbon on rm value was more pronounced after annealing at an intercritical temperature of 780°C (1435℉) than at a subcritical temperature of 710°C (1310℉). These and other observations, including variations in texture, anisotropy, strength, work hardening, and grain size, are discussed.

Model for Predicting the Recrystallized Ferrite Grain Size after Annealing of Cold-Rolled Automobile Body Sheet Steels

2018 ◽  
Vol 2018 (10) ◽  
pp. 968-972
Author(s):  
A. A. Vasilyev ◽  
S. F. Sokolov ◽  
P. S. Zhitelev ◽  
D. F. Sokolov ◽  
N. G. Kolbasnikov ◽  
...  
Keyword(s):  
Grain Size ◽  
Sheet Steels ◽  
Automobile Body ◽  
Cold Rolled ◽  
Ferrite Grain Size

Mechanical Properties and Bake Hardening Behaviour of two Cold Rolled Multiphase Sheet Steels subjected to CGL Heat Treatment Simulation

2006 ◽  
Vol 77 (9-10) ◽  
pp. 668-674 ◽  
Author(s):  
Markus Krieger ◽  
Yuri Estrin ◽  
Miloš Janeček ◽  
Matthias Niemeyer ◽  
Silke Paul
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Bake Hardening ◽  
Sheet Steels ◽  
Cold Rolled

Effect of Retained Austenite Stability on Mechanical Properties of 590MPa Grade TRIP Sheet Steels

2010 ◽  
Vol 638-642 ◽  
pp. 3374-3379 ◽  
Author(s):  
Hiroshi Matsuda ◽  
Hisata Noro ◽  
Yasunobu Nagataki ◽  
Yoshihiro Hosoya
Keyword(s):  
Mechanical Properties ◽  
Carbon Content ◽  
Retained Austenite ◽  
High Strain ◽  
Sheet Steels ◽  
Trip Steels ◽  
Austenite Stability ◽  
Retained Austenite Stability ◽  
The Stability ◽  
High Work

Industrial low alloy TRIP sheet steels contain blocky and lath-shaped retained austenite. In the present study, transformation behaviour of blocky and lath-shaped retained austenite during straining was investigated to clarify its effect on mechanical properties. Two types of TRIP steels containing almost the same amount but the different morphology of retained austenite were used. A steel containing large amount of lath-shaped retained austenite exhibits superior ductility, and sustains high work-hardenability in a high strain region. On the contrast, a steel containing large amount of blocky retained austenite exhibits low ductility. 　The work-hardenability increased steeply to the maximum at a low strain region, and then reduced in a high strain region. The stability of the blocky austenite has been found to be poor with respected to martensite transformation. The lath-shaped retained austenite remains until a high strain region whereas the blocky retained austenite transformed into martensite in a low strain region. Carbon content was higher in the lath-shaped retained austenite than in the blocky retained austenite. Stability of retained austenite is, however, inexplicable only by the carbon content, and would be affected by the different morphology and the resulting restraint conditions.

Nanocrystalline Twinning Induced Plasticity Steel with Superior Mechanical Properties Fabricated by Cold Rolling and Annealing

2013 ◽  
Vol 753 ◽  
pp. 518-521
Author(s):  
Rajib Saha ◽  
Rintaro Ueji ◽  
Nobuhiro Tsuji
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Yield Strength ◽  
Tensile Ductility ◽  
Grain Boundary Character ◽  
Mean Grain Size ◽  
Cold Rolling And Annealing ◽  
Superior Mechanical Properties ◽  
Cold Rolled ◽  
Evolution Of Microstructure

A study has been carried out on the evolution of microstructure, grain boundary character and mechanical properties in a Twinning Induced Plasticity steel heavily cold rolled and subsequently annealed.The cold rolled mcrostructures showed fine lamellar boundaries with many shear bands.With progress of annealing, numerous numbers of recrystallized grains were generated.The fully recrystallized steel showed equi-axed nanocrystalline grains with a mean grain size of 400 nm that enhanced the yield strength significantly while retaining tensile ductility.

Microstructure and Mechanical Properties Development in Cross Roll Rolled Ni-30Cr Alloy

2012 ◽  
Vol 706-709 ◽  
pp. 2462-2467
Author(s):  
Kuk Hyun Song ◽  
Han Sol Kim ◽  
Won Yong Kim
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Effective Strain ◽  
Initial Material ◽  
Grain Boundary Character ◽  
Microstructure And Mechanical Properties ◽  
Cold Rolled ◽  
Conventional Rolling ◽  
The Relationship ◽  
Electron Back Scattered Diffraction

In order to evaluate the microstructure and mechanical properties of cross roll rolled Ni-30Cr alloy, comparing with conventionally rolled material, this work was carried out. The materials were cold rolled to 90% in thickness reduction by conventional rolling and cross roll rolling methods and subsequently annealed at 700°C for 30 min. After this work, in order to evaluate the grain boundary character distributions of the materials, electron back-scattered diffraction technique was introduced. The application of cross roll rolling was more effective to develop the microstructure and mechanical properties than those of conventional rolling. As a result, the grain size was significantly refined to 1.3 μm in conventional rolling and 0.6 μm in cross roll rolling, compared to initial material (30 μm), respectively. Also, these grain refinements directly affected an increase in mechanical properties. In the present study, we systematically discussed the relationship between grain size and mechanical properties in terms of an increase in effective strain.

Microstructures, Mechanical Properties and Textures of Deep Drawing Dual-Phase Steel

2012 ◽  
Vol 535-537 ◽  
pp. 670-673
Author(s):  
Jie Yun Ye ◽  
Zheng Zhi Zhao ◽  
Zhi Gang Wang ◽  
Ai Min Zhao ◽  
Jing Jing Chen
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Dual Phase Steel ◽  
Tensile Tests ◽  
Rolled Sheet ◽  
Dual Phase ◽  
Annealing Texture ◽  
Average Grain Size ◽  
R Value ◽  
Heterogeneous Deformation

C-Mn-Cr-Mo dual phase steel was piloted in laboratory. OM, SEM, tensile tests and XRD were used to characterize the microstructures, mechanical properties and to determine the texture. The results indicate that when annealed at 860 °C, the tensile strength of the tested steel is 440 MPa, elongation and r value exceed 35% and 1.4, respectively. With the temperature increases from 820°C to 860°C, the average grain size of ferrite increases and ferrite trends to be uniform gradually, therefore, the r value increase gradually. When the temperature is higher than 860°C, bainite forming results in reducing of r value. Al could weaken the tendency of heterogeneous deformation and modified the annealing texture by refining hot-rolling grain size. Mo-based carbides existed in hot-rolled sheet developed {111} texture in the stage of ferrite recrystallization, then re-dissolved in intercritial annealing stage so as to improve hardenability.

Study of the Difference in Microstructures and Properties of Cold Rolled Dual Phase Steel with Different Composition

2012 ◽  
Vol 251 ◽  
pp. 351-354
Author(s):  
Hui Wang ◽  
Cheng Jiang Lin ◽  
Zhao Jun Deng ◽  
Ji Bin Liu
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Tensile Strength ◽  
Yield Strength ◽  
Grain Boundaries ◽  
Dual Phase Steel ◽  
Dual Phase ◽  
High Tensile Strength ◽  
Cold Rolled ◽  
The Difference

The difference in microstructures and properties of 600MPa cold rolled dual phase steel with the different composition had been studied in this paper. It can be noticed that the Si-Mn-Cr steel have finer ferrite and more martensite whose content is about 25%; the Mn-Cr-Mo steel have coarser ferrite and some coarse pearlite as well as little martensite; the microstructures of the Mn-Al-Mo steel are consist of mainly ferrite which have even grain size and 16% martensite which distributed homogenously along the ferrite grain boundaries. The difference in microstructure makes the steel own the different properties. The Si-Mn-Cr steel has the highest tensile strength and yield strength but the worst elongation, the Mn-Cr-Mo steel has the lowest tensile strength, the Mn-Al-Mo steel has the an excellent mechanical properties with low yield strength and high tensile strength as well as higher elongation.

New Approach for Multiplying the Strength and the Formability of Cold Rolled BCC Based Structure Steel through Ultra Fine Structure Technique

2020 ◽  
Vol 835 ◽  
pp. 141-148
Author(s):  
Hassan Bahaa-Eldin ◽  
Mamdouh Eissa ◽  
Ahmed Al-Sheikh ◽  
Mohamed Kamal El-Fawkhry ◽  
Taha Mattar
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Carbon Steel ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
Annealing Regime ◽  
Innovative Technique ◽  
Subcritical Annealing ◽  
Cold Rolled ◽  
Ferrite Grain Size

Reduction in grain size of bcc based structure steel is still highly concerned in the cold rolled sheet to attain superior mechanical properties. As long as, the reduction of weight is much considered in the structure purposes, the strength/weight ratio of steel is highly demanded. In this study, an innovative technique was applied to attain ferrite grain size with hundreds of nanometer, in tandem with preserving the mechanical properties. In this approach, the micro-alloyed low carbon steel resulted from the thermomechanical process was followed by subcritical annealing regime prior to the first critical transformation temperature. To identify the effect of a micro-alloying element as vanadium, and the effect of subcritical annealing regime on the low carbon steel, two low carbon steel was subjected to studying in this research. The results refer that applying a subcritical annealing regime for the micro-alloyed low carbon steel after hot compression at intercritical annealing temperature can lead for attaining hundreds of nanometer ferrite grain size, which has a powerful effect on promoting the strength of the steel to exceed 1200 Mpa, in one hand with preserving the formability up to 20% as uniform elongation. Unexpectedly, the fine grain size obtained after the innovative technique promotes the impact toughness at room temperature, which is attributed to the fineness and the spheroid morphology of the secondary phase in conjugation with bcc ferrite structure.

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