Extraordinary strength and ductility obtained in transformation-induced plasticity steel by slightly modifying its chemical composition

2017 ◽  
Vol 702 ◽  
pp. 225-231 ◽  
Author(s):  
N. Saeidi ◽  
M. Raeissi ◽  
H.R. Vaghei ◽  
M.M. Abdar
Keyword(s):  
Chemical Composition ◽  
Transformation Induced Plasticity ◽  
Strength And Ductility

Microstructure Optimization in δ-TRIP Steels with Al and Nb

2018 ◽  
Vol 930 ◽  
pp. 501-506
Author(s):  
Eustáquio de Souza Baêta Júnior ◽  
Ramón Alves Botelho ◽  
Leonardo Sales Araújo ◽  
Luiz P. Brandão ◽  
Sergio Neves Monteiro
Keyword(s):  
Chemical Composition ◽  
Alloying Elements ◽  
Eutectoid Temperature ◽  
Transformation Induced Plasticity ◽  
Trip Steels ◽  
Plasticity Effect ◽  
Δ Ferrite ◽  
Areas Of Interest ◽  
Thermocalc Software ◽  
Strength And Ductility

δ-TRIP steel is a recent concept and has been developed over the last ten years aiming to combine good mechanical strength and ductility. This class of steels is multiphase and contains δ and α ferrites, as well as austenite, bainite and/or martensite. The TRIP (Transformation Induced Plasticity) effect is influenced by those phases proportion, which depends on alloying contents. This paper investigates a chemical composition that allows adequate proportion among the phases, optimizing the microstructures by means of computational methods. These microstructures are designed to contain between 10 to 50% austenite, 10 to 70% α-ferrite and 20 to 80% δ-ferrite at the eutectoid temperature. The ThermoCalc Software [1] was used to predict the fractions of the microconstituents, producing graphs describing areas of interest of microconstituents as function of alloying elements variations that leads to the desired microstructure. Results indicate that the designed volume of the phases can be found for certain proportions among the alloying elements, higher concentrations of Al and Nb combined with C allow or not the occurrence of carbides and other phases in smaller quantities.

scholarly journals A METHOD FOR OPTIMIZING CHEMICAL COMPOSITION OF STEELS TO REDUCE RADICALLY THEIR ALLOY ELEMENTS AND INCREASE SERVICE LIFE OF MACHINE COMPONENTS

2017 ◽  
Vol 1 ◽  
pp. 3-12
Author(s):  
Nikolai Kobasko
Keyword(s):  
Chemical Composition ◽  
Service Life ◽  
Alloy Element ◽  
Steel Grades ◽  
Computer Calculations ◽  
Increase Service Life ◽  
Quenched Steel ◽  
Chemical Composition Of Steel ◽  
Compressive Residual Stresses ◽  
Strength And Ductility

A method for optimizing chemical composition of steel is proposed and a correlation is established to reduce cardinally alloy elements in existing steel grades that results in high compressive residual stresses at the surface of intensively quenched steel parts and increasing strength and ductility of material due to super- strengthening phenomenon. The algorithm of optimization consists in reducing alloy elements in existing alloy steel in 1.5 – 2 times and then lowering step-by-step content of steel, beginning from the most costly alloy element and ending the most cheaper one, until established correlation is satisfied. The range of reduction is minimal and during computer calculations can be chosen as 0,001wt%. The proposed approach can save alloy elements, energy, increase service life of machine components and improve environmental condition. The method is a basis for development of the new low hardenability (LH) and optimal hardenability (OH) steels.

Toward the Development of AHSS for Wear Resistant Applications

2018 ◽  
Vol 941 ◽  
pp. 568-573 ◽  
Author(s):  
Preston Wolfram ◽  
Christina Hensley ◽  
Ronald Youngblood ◽  
Rachael Stewart ◽  
Emmanuel de Moor ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Retained Austenite ◽  
Process Development ◽  
High Strength ◽  
Advanced High Strength Steel ◽  
Wear Resistant ◽  
Transformation Induced Plasticity ◽  
Enhance Wear Resistance ◽  
Improve Wear Resistance ◽  
Strength And Ductility

Advanced High Strength Steel (AHSS) developments have largely focused on automotive applications using metallurgical approaches to develop retained austenite-containing microstructures in a variety of new steels, using the transformation-induced plasticity (TRIP) effect to achieve better combinations of strength and ductility. These efforts have been extended in recent studies to explore the potential to improve wear resistance, using metastable retained austenite to enhance wear resistance for earth-moving and other applications. This paper provides selected highlights of the authors’ efforts to develop wear resistant steels using AHSS processing approaches. Some attractive product/process development opportunities are identified, and it appears that martensite-austenite microstructures produced using “quenching and partitioning” exhibit increased wear resistance.

Enhancing both strength and ductility of low-alloy transformation-induced plasticity steel via hierarchical lamellar structure

2020 ◽  
Vol 183 ◽  
pp. 96-101 ◽  
Author(s):  
Lihe Qian ◽  
Kaifang Li ◽  
Fan Huang ◽  
Dongdong Li ◽  
Tongliang Wang ◽  
...  
Keyword(s):  
Lamellar Structure ◽  
Transformation Induced Plasticity ◽  
Strength And Ductility

Microstructure and Mechanical Properties of Cold-Rolled TRIP Steel Sheets

2011 ◽  
Vol 266 ◽  
pp. 280-283 ◽  
Author(s):  
Cai Nian Jing ◽  
Xiao Hui Chen ◽  
Ming Gang Wang ◽  
Qi Zhong Tian ◽  
Zuo Cheng Wang
Keyword(s):  
Retained Austenite ◽  
High Strength ◽  
Transformation Induced Plasticity ◽  
Trip Steels ◽  
Multiphase Microstructure ◽  
Steel Sheets ◽  
High Strength Level ◽  
Cold Rolled ◽  
Level 2 ◽  
Strength And Ductility

Transformation induced plasticity (TRIP) steels have complex multiphase microstructure composed of ferrite, bainite and retained austenite [1]. These metastable retained austenite can transforms into martensite during plastic deformation, which generates a TRIP effect resulting in excellent combination of high strength and ductility even at high strength level [2-5]. For this reason, the TRIP-aided steel sheets are suitable to fabricate automobile parts, as they can offer excellent formability without sacrifice the strength and safety requirement of the steel sheets. As a result, the development of TRIP-aided steels has been a very important issue in the automobile field.

High strength and ductility in low-cost Ti–Al–Fe–Mn alloy exhibiting transformation-induced plasticity

2020 ◽  
Vol 772 ◽  
pp. 138813 ◽  
Author(s):  
Jeong Mok Oh ◽  
Chan Hee Park ◽  
Jong-Taek Yeom ◽  
Jae-Keun Hong ◽  
Namhyun Kang ◽  
...  
Keyword(s):  
Low Cost ◽  
High Strength ◽  
Transformation Induced Plasticity ◽  
Strength And Ductility

scholarly journals Overcoming Strength-Ductility Trade-Off at Cryogenic Temperature of Low Carbon Low Alloy Steel via Controlling Retained Austenite Stability

Metals ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 157
Author(s):  
Xuelin Wang ◽  
Zhenjia Xie ◽  
Chengjia Shang ◽  
Gang Han
Keyword(s):  
Retained Austenite ◽  
Mechanical Stability ◽  
Testing Temperature ◽  
Low Carbon ◽  
Transformation Induced Plasticity ◽  
Strain Behavior ◽  
Austenite Stability ◽  
Work Hardening Rate ◽  
Multiphase Steel ◽  
Strength And Ductility

Stress–strain behavior of a low carbon low alloy multiphase steel with ferrite, tempered bainite, and retained austenite was studied at different cryogenic temperatures. Results indicated that both strength and ductility were enhanced with decreasing tensile testing temperature. The enhancement of both strength and ductility was attributed to the decreased mechanical stability of retained austenite with decreasing temperature, resulting in sufficient transformation induced plasticity (TRIP) effect for increasing work hardening rate.

scholarly journals Welding Effects on the Mechanical Integrity of a Trip800 Steel: a Comparison of Laser Co2 and Gmaw Processes/ Wpływ Spawania Na Integralność Mechaniczna Stali Trip800: Porównanie Spawania Laserowego Ze Spawaniem Elektrodą Topliwą

2014 ◽  
Vol 59 (4) ◽  
pp. 1427-1432 ◽  
Author(s):  
G.Y. Perez-Medina ◽  
H.F. Lopez ◽  
F.A. Reyes-Valdés ◽  
A. Garza-Gomez ◽  
Luis M. López-Ochoa
Keyword(s):  
Arc Welding ◽  
Gas Metal Arc Welding ◽  
High Hardness ◽  
Relative Volume ◽  
X Ray Diffraction ◽  
Transformation Induced Plasticity ◽  
X Ray ◽  
Metal Arc Welding ◽  
Color Metallography ◽  
Strength And Ductility

Abstract In this work a strip of a transformation induced plasticity (TRIP) steel was welded using gas metal arc welding (GMAW) and Laser CO2 welding (LBW) processes and the resultant strength and ductility of the welded joints evaluated. It was found that LBW lead to relatively high hardness in the fusion zone, FZ where the resultant microstructure was predominantly martensite. The relative volume fractions of phases developed in the welded regions were quantitatively measured using color metallography combined with X-ray diffraction analyses. It was found that the heat affected zone, HAZ developed the maximum amount of martensite (up to 32%) in the steel welded using LBW besides a mixture of bainite, retained austenite and ferrite phases. In contrast, a relatively low percent of martensite (10.8%) was found in the HAZ when the GMAW process was implemented.

Studies for the Influences of Welding Parameters of GMA Welded 600MPa Grade TRIP Steel

2007 ◽  
Vol 26-28 ◽  
pp. 503-506
Author(s):  
Gyeong Choel Lee ◽  
Jae Seong Kim ◽  
Bo Young Lee ◽  
Sang Yul Lee
Keyword(s):  
Trip Steel ◽  
Environmental Problem ◽  
High Strength ◽  
Hardness Test ◽  
Experimental Methods ◽  
Welding Parameters ◽  
Shielding Gases ◽  
Butt Welding ◽  
Transformation Induced Plasticity ◽  
Strength And Ductility

Due to the environmental problem, automotive companies are trying to reduce the weight of the car body. Therefore, TRIP (TRansformation Induced Plasticity) steels, which have high strength and ductility, have been developed. However, there are only a few publication reported on the characteristics of GMA weld on TRIP steel. In this study, we will evaluate which of the shielding gases, i.e. Ar 100% CO2 100% and Ar 85% + CO2 15%, and welding speed make a better quality GMA welded TRIP steel. Bead-on plate welding and butt welding were performed with various welding conditions. In order to identify mechanical properties of welded TRIP steel experimental methods including fractography, tensile test, and hardness test were performed.

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