Microalloying of Cold-Formable Multi Phase Steel Grades

2005 ◽  
Vol 500-501 ◽  
pp. 97-114 ◽  
Author(s):  
Wolfgang Bleck ◽  
Kriangyut Phiu-On
Keyword(s):  
Precipitation Hardening ◽  
High Strength Steels ◽  
High Strength ◽  
Chemical Compositions ◽  
Advanced High Strength Steels ◽  
Steel Grades ◽  
High Manganese Steels ◽  
Microalloying Elements ◽  
Multi Phase ◽  
Manganese Steels

Microalloying elements like Al, B, Nb, Ti ,V can be used to optimise the microstructure evolution and the mechanical properties of advanced high strength steels (AHSS). Microalloying elements are characterised by small additions < 0.1 mass% and their ability to form carbides or nitrides. They can increase strength by grain refinement and precipitation hardening, retard or accelerate transformations and affect the diffusion kinetics as well as the stacking fault energy. Thus, by their addition the AHSS with their high requirements to process control can be adopted to existing processing lines. Different combinations of microstructural phases and different chemical compositions have been investigated for AHSS in order to combine high strength with excellent formability. The recently developed high manganese steels further improve the formability due to their austenitic microstructure and inherent phase transformations during forming.

Influence of Microalloying Elements Ti and Nb on Recrystallization during Annealing of Advanced High-Strength Steels

2016 ◽  
Vol 879 ◽  
pp. 217-223 ◽  
Author(s):  
Marion Bellavoine ◽  
Myriam Dumont ◽  
Josée Drillet ◽  
Philippe Maugis ◽  
Véronique Hebert
Keyword(s):  
High Strength Steels ◽  
High Strength ◽  
Solute Drag ◽  
Dual Phase ◽  
Comparative Efficiency ◽  
Advanced High Strength Steels ◽  
Steel Grades ◽  
Cold Rolled ◽  
Microalloying Elements ◽  
Predominant Effect

Microalloying elements Ti and Nb are commonly added to high-strength Dual Phase steels as they can provide efficient means for additional strengthening due to grain refinement and precipitation strengthening mechanisms. In the form of solute elements or as fine carbonitride precipitates, Ti and Nb are also expected to have a significant effect on the microstructural changes during annealing and especially on recrystallization kinetics. The present work investigates the influence of microalloying elements Ti and Nb on recrystallization in various cold-rolled Dual Phase steel grades with the same initial microstructure but different microalloying contents. Using complementary experimental and modeling approaches makes it possible to give some clarifications regarding both the nature of this effect and the comparative efficiency of Ti and Nb on delaying recrystallization. It is shown that niobium is the most efficient micro-alloying element to impede recrystallization and that the predominant effect is solute drag.

Design of Modern Steels for Automotive Application

2010 ◽  
Vol 638-642 ◽  
pp. 3111-3116 ◽  
Author(s):  
Harald Hofmann ◽  
Thomas Heller ◽  
Sascha Sikora
Keyword(s):  
High Strength Steels ◽  
Superplastic Forming ◽  
High Strength ◽  
Hot Forming ◽  
Automotive Application ◽  
Advanced High Strength Steels ◽  
Automobile Components ◽  
Multi Phase ◽  
Further Development ◽  
Complex Parts

Advanced high-strength steels offer a great potential for the further development of automobile bodies-in-white due to their combined mechanical properties of high formability and strength. New types of grades – multi-phase steels, superductile steels and density reduced steels – are under development at ThyssenKrupp Steel with tensile strength levels of up to 1000 MPa in combination with excellent formability for the high demands of cold formed structural automobile components. New forming technologies at increased temperatures – hot forming, semi-hot forming and superplastic forming - enable the processing of complex parts with extreme high strength. ThyssenKrupp Steel identifies potential future steels and technology concepts by technology monitoring and evaluates their potential for future applications in pre-development projects. University research institutions are significantly involved in this essential future oriented challenge. Seminal concepts are being implemented together with automotive manufactures by simultaneous engineering processes with coordinated phases of production and testing.

Application of Advanced Multiphase Steels in Crashworthiness Structures: Experimental Study and Constitutive Equations

2006 ◽  
Vol 514-516 ◽  
pp. 579-583 ◽  
Author(s):  
Nuno Peixinho ◽  
António Pinho
Keyword(s):  
Constitutive Equations ◽  
Tensile Testing ◽  
High Strength Steels ◽  
High Strength ◽  
Experimental Program ◽  
Dual Phase ◽  
Strain Rates ◽  
Trip Steels ◽  
Advanced High Strength Steels ◽  
Steel Grades

This work presents results of tensile testing of advanced high strength steels of interest for crashworthy structures: Dual-Phase and TRIP (Transformation Induced Plasticity) steels. The improvements in vehicle crashworthiness observed in recent years have been closely linked to advanced high-strength steels that are currently being produced or in process of development. Amongst these, Dual-Phase and TRIP steels have presented excellent properties for use in crashworthy structures. For these steel grades an understanding of material behaviour at relevant strain rates is needed as well as constitutive equations suitable for use in analytic and numerical calculations. For that purpose an experimental program of tensile testing was performed in a range of strain rates of interest for crashworthiness problems: 0.0001 /s to 1000 /s. The test results were used to compare material properties and to evaluate the Cowper-Symonds constitutive equation and a modified version. Crush tests were performed at different speeds for top-hat and hexagonal tubes manufactured using laser welding and the results discussed in view of energy absorption.

Springback Behavior of Advanced High Strength Steel (AHSS) CP800

2013 ◽  
Vol 820 ◽  
pp. 45-49 ◽  
Author(s):  
Mei Zhang ◽  
Jun Zhang ◽  
Yu Xiang Ning ◽  
Tao Wang ◽  
Zi Wan
Keyword(s):  
High Strength Steels ◽  
High Strength ◽  
Test Results ◽  
Complex Phase ◽  
Advanced High Strength Steels ◽  
Test Conditions ◽  
Hsla Steels ◽  
Blank Holding Force ◽  
Microalloying Elements ◽  
Springback Behavior

800MPa grade Advanced High Strength Steels (AHSS), Complex Phase steel CP800, containing microalloying elements, are chosen to test the stamping properties in different test conditions and compared with traditional high strength low alloy (HSLA) steels HSLA S700MC. Tensile test, and HAT shape stamping test are taken to investigate the properties of the materials. Test results indicate that the studied 800MPa grade AHSS shows a better strength ductility balance compared with the reference HSLA steels. Under the same HAT shape springback stamping condition, HSLA steels S700MC always show the largest springback deformation among the investigated steels. While springback angles of all the AHSS studied are markedly smaller than that of steel S700MC. Among the 3 kinds of AHSS researched, CP800T always show the largest springback deformation. Domestic steel CP800 and imported CP800S show much smaller springback deformation respectively. In BHF of 100KN condition, springback deformation of 3 kinds of AHSS reaches the top value among all the BHF conditions. However, steel CP800 indicates an outstanding springback restrain trend in blank holding force (BHF) further increasing attempt. Thus, springback behavior can be restricted obviously by using a larger blank holding force (BHF) in steel CP800 stamping cases.

Manufacturing of Innovative Car Seat Components by Forming of Advanced High Strength Steels – Fundamental Research and Application

2009 ◽  
Vol 410-411 ◽  
pp. 3-11 ◽  
Author(s):  
Marion Merklein ◽  
Markus Kaupper
Keyword(s):  
High Strength Steels ◽  
High Strength ◽  
Absorption Capacity ◽  
Car Seat ◽  
Advanced High Strength Steels ◽  
Steel Sheets ◽  
Transportation Sector ◽  
Steel Grades ◽  
Fundamental Research ◽  
Part Complexity

Nowadays advanced high strength steel sheets and related forming technologies play an important role in lightweight construction in the transportation sector. Since especially car seat components are subject to very strict safety demands, the application of these modern steel grades, which provide enhanced strength levels, seems to be a promising strategy to meet the challenge of reducing the sheet metal thickness while maintaining the crash energy absorption capacity. Concerning the high required level of part complexity and accuracy both the reduced formability and the increased springback tendency of advanced high strength steels are challenges for forming technologies compared to conventional steel grades. Against this background the forming potentials of advanced high strength steels are investigated and are made accessible for an application in structural car seat components. The analysis is to be done both experimentally and numerically, focusing on the finite element method (FEM) regarding a reliable process design.

Modeling of C-Mn Chromium Containing Steel to Produce DP600 through Thin Slab Direct Rolling

2010 ◽  
Vol 638-642 ◽  
pp. 3502-3507
Author(s):  
M. Wagih ◽  
M. Shahtout ◽  
A. Kady
Keyword(s):  
Grain Size ◽  
High Strength Steels ◽  
High Strength ◽  
Production Costs ◽  
Dual Phase ◽  
Austenite Grain Size ◽  
Advanced High Strength Steels ◽  
Steel Grades ◽  
Direct Rolling ◽  
Part Complexity

The design of new steel grades and microstructures is mostly motivated by the necessity of steel industry to process always better suited high strength steel with low production costs. Automotive customers are asking for more steel options to meet increased specifications for strength, crash worthiness, energy absorption, part complexity, and dent resistance. To meet these requirements, new developed types of steel known as Advanced High-Strength Steels (AHSS) were introduced (e.g.: DP steel "Dual Phase", TRIP steel "Transformation Induced Plasticity",…etc). This paper presents a case study for producing DP600 dual phase steel in EZDK company through building up an integrated model to predicting both final austenite grain size after finishing rolling and the final ferrite grain size after cooling.

Application of Dual-Phase and TRIP Steels on the Improvement of Crashworthy Structures

2005 ◽  
Vol 502 ◽  
pp. 181-188 ◽  
Author(s):  
Nuno Peixinho ◽  
N. Jones ◽  
António Pinho
Keyword(s):  
High Strength Steels ◽  
High Strength ◽  
Tensile Tests ◽  
Dual Phase ◽  
Strain Rates ◽  
Trip Steels ◽  
Advanced High Strength Steels ◽  
Steel Grades ◽  
Determination Of Parameters

The improvements in vehicle crashworthiness observed in recent years have been closely linked to advanced high-strength steels that are currently being produced or in process of development. Amongst these, Dual-Phase and TRIP (Transformation Induced Plasticity) steels have presented excellent properties for use in crashworthy structures. For these steel grades an understanding of material behaviour at relevant strain rates is needed as well as constitutiv eequations suitable for use in analytic and numerical calculations. In this study the crashworthiness of thin-walled sections made of Dual-Phase and TRIP steels was investigated. Tensile tests were performed at different strain rates in a range of interest for crashworthiness problems. The results allowed the determination of parameters of Cowper-Symonds equation. Crush tests were performed at different speeds for top-hat and hexagonal tubes manufactured using laser welding. The experimental results were compared with numerical simulations obtained with LS-DYNA software. The influence of different material parameters on the accuracy of the simulations was examined.

scholarly journals Arvedi ESP Technology - The Hot Rolling of HS and AHS Thin Gauge Steel Strips

2016 ◽  
Vol 854 ◽  
pp. 42-47 ◽  
Author(s):  
Roberto Venturini ◽  
Paolo Daniele Avancini ◽  
Nicola Barbier ◽  
Alessandro Rizzi
Keyword(s):  
Hot Rolling ◽  
Industrial Production ◽  
High Strength Steels ◽  
High Strength ◽  
Dual Phase ◽  
Advanced High Strength Steels ◽  
Steel Strips ◽  
Start Up ◽  
Steel Grades ◽  
Mechanical Investigation

After 5 years from start-up, Arvedi ESP Technology has achieved outstanding performances in terms of production, products and quality. The technology has proved particularly suitable for the production of thin gauge strips (< 2 mm). This paper presents the experiences in the production of high strength and advanced high strength steels, such as micro-alloyed S550MC, dual phase DP600 and ferritic bainitic HR60 in thin gauge strips on the ESP line of Acciaieria Arvedi S.p.A. in Cremona. Some aspects of the industrial production process for these steel grades are highlighted on the basis of casting and rolling parameters and microstructural and mechanical investigation.

scholarly journals Third generation of advanced high strength sheet steels for the automotive sector : A literature review

2021 ◽  
Vol 11 (4) ◽  
pp. 241-247
Author(s):  
Meknassi Raid Fekhreddine ◽  
Miklós Tisza
Keyword(s):  
Literature Review ◽  
Bainitic Ferrite ◽  
High Strength Steels ◽  
High Strength ◽  
Third Generation ◽  
Sheet Steels ◽  
Advanced High Strength Steels ◽  
The Third ◽  
Recent Developments ◽  
Steel Grades

The modern vehicles demand a better fuel economy, decrease in ozone harming substance outflows, and superior safety requirements led to new developments of steel grades with higher strength and good formability. Third generation of advanced high strength steels are the next stage for the automotive companies in steel sheets development. The principal concept of third generation of AHSS is to reap the mechanical properties benefits from first and second generation of AHSS at cost neither too high nor too low. This literature review summarizes the results achieved in a previous paper of the Third Generation of Advanced High Strength Sheet steels literature published by D. Krizan et al. Where we intend to focus on, the recent developments and future trends of the third generation of advanced high strength sheet steels (3-GEN AHSSs) including quenching and partitioning (Q&P), TRIP bainitic ferrite (TBF), medium manganese, density reduced TRIP (δ-TRIP) and nano steels for the modern automotive industry, with emphasis on their main characteristics, processing, and applications.

scholarly journals Advanced High-Strength Steels by Quenching and Partitioning

Metals ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1419
Author(s):  
Ilchat Sabirov ◽  
María J. Santofimia ◽  
Roumen H. Petrov
Keyword(s):  
High Strength Steels ◽  
High Strength ◽  
Chemical Compositions ◽  
Quenching And Partitioning ◽  
Advanced High Strength Steels ◽  
Heating And Cooling

Quenched and partitioned (Q&P) steels are recently developed materials with carefully selected chemical compositions and multiphase microstructures resulting from precisely controlled heating and cooling processes [...]

Sign in / Sign up

Export Citation Format

Share Document