New Advanced High Strength Steels : Optimizing Properties / coordinated by Mohamed Goune, Thierry Iung, and Jean-Hubert Schmitt.

Format:

Book

Contributor:

Goune, Mohamed, editor.

Iung, Thierry, editor.

Schmitt, Jean-Hubert, editor.

Language:

English

Subjects (All):

Steel.

Physical Description:

1 online resource (413 pages)

Edition:

First edition.

Place of Publication:

London, England : ISTE Ltd, [2023]

Summary:

In recent years, significant developments have been made to increase the mechanical strength of steels in order to reduce the overall weight of structures, particularly in motor vehicles. Depending on the application, the increase in strength should not be at the expense of forming and in-use properties. The development of ultra-high strength steels requires a search for new trade-offs between these properties in order to optimize the final microstructure. New Advanced High Strength Steels analyzes the interactions between tensile mechanical properties and properties such as work hardening, anisotropy, resistance to rupture, fatigue life, corrosion resistance, crashworthiness, edge retention, hydrogen resistance and weldability. It also examines the links between the microstructural parameters of high-strength steels and the properties mentioned above. It highlights the metallurgical developments that have been necessary for the emergence of these new generations of steels. The book concludes with a look ahead to future developments in ultra-high strength steels.

Contents:

Cover

Title Page

Copyright Page

Contents

Foreword

Introduction

Chapter 1. Strain Hardening and Tensile Properties

1.1. Introductory remarks

1.2. Stress/strain curve: macroscopic quantities

1.3. Behavior of a single-phase structure: microscopic approach

1.3.1. Elastic limit

1.3.2. Strain hardening and plasticity

1.4. Strain hardening and mechanical behavior of precipitation hardened micro-alloyed steels

1.4.1. Introductory remarks

1.4.2. Identification of the different contributions to strain hardening

1.4.3. Reference materials and data from the theoretical analysis

1.4.4. Strain hardening and mechanical properties: effect of grain size

1.4.5. Strain hardening and mechanical properties: effects of precipitation

1.5. Strain hardening and mechanical behavior of martensitic steels

1.5.1. Multiscale structure and mechanical properties

1.5.2. Tensile properties and strain hardening

1.5.3. Effect of carbon on changes in YS0.2 and UTS

1.6. Austenitic steels Fe-0.6C-22Mn with TWIP effect

1.6.1. Introductory remarks

1.6.2. Role of twins and nature of strain hardening

1.6.3. Strain hardening and mechanical behavior of Fe-0.6C-22Mn steel

1.6.4. Evolution of the yield strength

1.7. Multiphase quenching and partitioning steels

1.7.1. From dual-phase, TRIP to quenching and partitioning steels

1.7.2. Phenomenological approaches to the mechanical behavior of multiphase steels

1.7.3. Mechanical properties and strain hardening of Q&amp

P steels

1.8. Conclusion

1.9. References

Chapter 2. Anisotropy and Mechanical Properties

2.1. Challenges

2.1.1. The problem of textures in modern steels

2.1.2. The problem of phase transformation textures

2.2. Textural anisotropy and mechanical properties

2.2.1. Typical orientations of ferrite.

2.2.2. Typical orientations of austenite

2.2.3. Typical orientations of phase transformation

2.3. Conclusion

2.4. Calculation details

2.4.1. How to calculate the Young's modulus of a textured polycrystal?

2.4.2. How to calculate the Lankford coefficient of a textured polycrystal?

2.4.3. How to calculate the yield surface of a textured polycrystal?

2.5. References

Chapter 3. Compromise between Strength and Fracture Resistance

3.1. Introduction

3.2. Methods for measuring the resistance to damage and fracture

3.2.1. Fracture elongation

3.2.2. Bending impact toughness

3.2.3. Fracture toughness: resistance to unstable crack propagation

3.3. Physical mechanisms and microstructural control of damage and fracture

3.3.1. Brittle transgranular cleavage fracture

3.3.2. Ductile fracture by cavitation

3.3.3. Intergranular brittle fracture

3.3.4. Synthesis on fracture mechanisms

3.4. Examples of application

3.4.1. Fracture toughness and ultra-high strength

3.4.2. Fracture resistance of multiphase grades

3.5. Conclusion and outlook

3.6. References

Chapter 4. Compromise between Tensile and Fatigue Strength

4.1. Toughness: the main cause of part failure in service

4.2. Fatigue: from crack initiation to failure

4.2.1. Approaches to determine the risk of failure through mechanical fatigue

4.2.2. Crack initiation mechanisms

4.2.3. Crack propagation mechanisms

4.2.4. Increasing the ultimate tensile strength or the propagation threshold? Approach of Kitagawa-Takahashi for the harmfulness of a defect

4.3. How to improve fatigue life through metallurgy?

4.3.1. Link between ultimate tensile strength and fatigue resistance

4.3.2. Postpone the crack initiation or activation of plasticity to the highest stresses

4.3.3. Slowing down the propagation of cracks.

4.4. Increasing role of defects in high strength steels

4.4.1. Murakami's approach: small defects and short cracks

4.4.2. Decreased fatigue strength of quenched and tempered steels in the presence of sulfide inclusions

4.5. Specific treatments for fatigue performance

4.5.1. Thermochemical treatments

4.5.2. Mechanical treatments

4.5.3. Case of welding

4.6. Conclusion

4.7. References

Chapter 5. High Strength Steels and Coatings

5.1. Introduction

5.2. The continuous galvanizing process

5.2.1. Mechanisms involved in the steel/liquid metal interaction

5.2.2. Intermetallic compounds and coating

5.3. Selective oxidation during continuous annealing

5.3.1. Thermodynamic stability of oxides

5.3.2. Reactive diffusion

5.4. Coatings on high-strength steels

5.4.1. Liquid metal wetting of partially oxidized steels

5.4.2. Process adaptations for galvanizing high-strength steels

5.4.3. Use of other coating processes

5.5. Conclusion

5.6. References

Chapter 6. Corrosion Resistant Steels with High Mechanical Properties

6.1. Introduction

6.2. General principles of corrosion/oxidation and corrosion/oxidation resistance

6.3. Wet corrosion resistant and high strength steels

6.3.1. Weathering steels

6.3.2. Stainless steels

6.3.3. Process-corrosion relationship: examples in additive manufacturing

6.4. Alloys resistant to hot oxidation and creep

6.4.1. "9-12 Cr" ferritic-martensitic steels

6.4.2. AFA steels

6.5. Conclusion

6.6. References

Chapter 7. Crashworthiness by Steels

7.1. Introduction and industrial issues

7.2. The tests in force, or how to pass from the behavior of the complete vehicle to the behavior of the material

7.2.1. Full vehicle test

7.2.2. Component testing and performance and evaluation criteria.

7.2.3. Tests on simple specimens (strain rate and failure strain)

7.3. Parameters influencing the material during the manufacturing process and the behavior in service

7.3.1. Forming/cutting

7.3.2. Assembly (spot welding)

7.3.3. Paint curing treatment

7.4. Adequacy between material properties and crash behavior according to the different evaluation criteria

7.4.1. Anti-intrusion effort

7.4.2. Average crushing force - energy absorption

7.4.3. Ductility/failure of the material in crash

7.4.4. Ductility/failure of crash assemblies: special case of the thermally affected zone

7.5. Conclusion

7.6. References

Chapter 8. Cut Edge Behavior

8.1. Introduction/problem analysis

8.2. Cutting processes and characteristics of the cut edge

8.2.1. The different cutting processes

8.2.2. Description of the punched or sheared edge

8.2.3. Parameters influencing the quality of cutting by shearing or punching

8.3. Behavior of the cut edge

8.3.1. The different edge characterization tests

8.3.2. Parameters influencing the behavior of the cut edge

8.3.3. In-use behavior: fatigue and crash cases

8.3.4. Cut edge behavior of the main families of steels

8.3.5. Modeling the cut edge in finite elements stamping codes

8.4. Conclusion

8.5. References

Chapter 9. The Relationship between Mechanical Strength and Hydrogen Embrittlement

9.1. Introduction

9.2. How to identify and characterize HE

9.2.1. Fractographic analysis

9.2.2. Chemical and microstructural analysis

9.2.3. Laboratory mechanical testing

9.3. Solubility and (apparent) diffusion coefficients of hydrogen in steels

9.3.1. Hydrogen sources (intrinsic/environmental)

9.3.2. Hydrogen transport in steels

9.3.3. Evidence of HE

9.4. Case study: embrittlement of fastener steels

9.4.1. Recent incidents of in-service failures.

9.4.2. Phenomenological description and sensitivity parameters

9.4.3. Martensitic steels - industrial strategies

9.5. Case study: HE of thin sheets

9.5.1. Specific case: austenitic TWIP steel

9.5.2. TWIP steels - industrial strategies

9.6. Research and perspectives

9.7. References

Chapter 10. Weldability of High Strength Steels

10.1. Introduction

10.1.1. Overview

10.1.2. Microstructural changes in the heat-affected zone

10.2. Weldability issues

10.2.1. Softening in HAZ and FZ

10.2.2. Toughness-resilience

10.2.3. Cold cracking

10.2.4. Hot cracking

10.2.5. Reheat cracking

10.2.6. Liquid metal embrittlement

10.3. Solutions for a good weldability of high-strength steels

10.3.1. Filler metals

10.3.2. Post-weld heat treatments

10.3.3. Design of a weldable high-strength steel

10.4. References

Appendix: A Brief Review of Steel Metallurgy

Postface: What's Next for Ultra-high Strength Steels?

List of Authors

Index

EULA.

Notes:

Print version record.

Includes bibliographical references and index.

Other Format:

Print version: Goune, Mohamed New Advanced High Strength Steels

ISBN:

9781394257430

1394257430

9781394257416

1394257414

OCLC:

1417665684