Duplex stainless steels

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adam_text Table of Contents Preface ........................................... xiii Chapter 1. Process: Hot Workability ........................ 1 Isabel GUTIERREZ and Amaia IZA-MENDIA 1.1. Introduction .................................... 1 1.2. As-cast microstructure ............................. 1 1.3. Microstructural evolution during hot working ............... 4 1.3.1. Changes in morphology and distribution of the dispersed γ phase ....................................... 6 1.3.2. Plastic deformation ............................. 7 1.3.3. Rotation ................................... 11 1.3.4. Interphase boundary sliding ........................ 12 1.3.5. Shear banding ................................ 14 1.3.6. Fragmentation ................................ 15 1.4. Mechanical behavior under hot working ................... 16 1.4.1. Constitutive equations ........................... 17 1.4.2. Fraction of phases and strength ratio .................. 18 1.4.3. Composition and element partitioning ................. 19 1.4.4. The two-phase rule ............................. 21 1.4.5. Strain partitioning .............................. 22 1.4.6. Deformation mode and phase morphology ............... 25 1.4.7. Axially oriented microstructures deformed in pure shear ...... 26 1.5. Static softening .................................. 28 1.6. Hot workability ................................. 31 1.6.1. Effect of composition ........................... 32 1.6.2. As-cast microstructures .......................... 33 1.6.3. Hot ductility ................................. 34 1.6.4. Sources of failure .............................. 35 vi Duplex Stainless Steels 1.6.5. Multipass sequences ............................ 38 1.7. Conclusions .................................... 39 1.8. Acknowledgments ................................ 39 1.9. References .................................... 39 Chapter 2. Corrosion Resistance Properties .................... 47 Jacques CHARLES 2.1. Introduction .................................... 47 2.2. The duplex grades and pitting resistance equivalent numbers ...... 48 2.2.1. Chemistry of some of the main commercialized duplex grades. . . 48 2.2.2. The specific case of nitrogen ....................... 49 2.3. Some fundamentals concerning stainless steel corrosion resistance. . . 50 2.3.1. General considerations ........................... 50 2.3.2. Some definitions .............................. 51 2.3.3. Parameters affecting the corrosion resistance of duplex grades. . . 54 2.4. The different forms of corrosion ....................... 60 2.4.1. General considerations ........................... 60 2.4.2. General corrosion .............................. 61 2.4.3. Pitting and crevice ............................. 74 2.4.4. IGC ...................................... 88 2.4.5. SCC ...................................... 91 2.4.6. Fatigue and corrosion fatigue ....................... 97 2.5. Some complex corrosion behaviors encountered in industrial applications ...................................... 100 2.5.1. Marine environments and seawater applications ........... 100 2.5.2. Thermal desalination plants ........................ 102 2.5.3. Industrial experiences with severe chloride-containing environments .................................... 104 2.5.4. Oil and gas industry ............................ 105 2.5.5. Flue gas desulferization (FGD) pollution-control equipment of coal thermal plants ............................... 106 2.5.6. Some other industrial applications .................... 109 2.5.7. Building and construction ......................... 110 2.6. Conclusions .................................... Ill 2.7. References .................................... Ill Chapter 3. Phase Transformation and Microstructure ............. 115 Angelo Fernando PADILHA and Ronald Lesley PLAUT 3.1. Introduction .................................... 115 3.2. Phase diagrams and typical phases ...................... 117 3.3. Solidification ................................... 120 3.4. Austenite precipitation ............................. 121 Table of Contents vii 3.5. Phase changes occurring below l,000°C .................. 123 3.5.1. Chromium carbide (M23C6) precipitation ................ 124 3.5.2. Chromium nitride (C^N) precipitation ................. 125 3.5.3. Chiphase (χ) precipitation ........................ 126 3.5.4. Sigma phase (σ) precipitation ....................... 126 3.5.5. Alpha prime (a ) formation ........................ 130 3.6. Cold working and annealing .......................... 132 3.7. Final remarks ................................... 134 3.8. References .................................... 135 Chapter 4. Welding Processes, Microstructural Evolution and Final Properties of Duplex and Superduplex Stainless Steels ............. 141 Franco BONOLLO, Alberto TIZIANI and Paolo FERRO 4.1. Introduction .................................... 141 4.2. б -ferrite —» austenite transformation ..................... 142 4.3. Secondary and intermetallic phases precipitation during welding processes ........................................ 145 4.4. Welding processes for DSS and SDSS .................... 147 4.4.1. Conventional arc welding processes ................... 148 4.4.2. Innovative high power density processes ................ 150 4.5. Final remarks ................................... 155 4.6. References .................................... 155 Chapter 5. Thermal Embrittlement of Cast Duplex Stainless Steels: Observations and Modeling .............................. 161 André PINEAU and Jacques BESSON 5.1. Introduction .................................... 161 5.2. Composition, elaboration, microstructure, and mechanical properties ........................................ 163 5.2.1. Influence of chemical composition ................... 163 5.2.2. Solidification of DSS ............................ 165 5.2.3. Microstructure of cast CF8M DSS .................... 167 5.2.4. Mechanical properties of DSS ...................... 169 5.3. Thermal embrittlement of the ferrite phase in DSS ............ 170 5.3.1. Binary Fe-Cr stainless steels ....................... 170 5.3.2. DSS: α/α demixtion, phase G and other precipitation reactions ....................................... 173 5.3.3. DSS: consequences of thermal aging on mechanical properties ...................................... 176 5.4. Materials investigated and embrittlement heat treatments ........ 181 5.4.1. Materials - heat treatments ........................ 181 5.4.2. Mechanical properties ........................... 183 viii Duplex Stainless Steels 5.5. Damage and rapture ............................... 186 5.6. Scale effect and scatter ............................. 189 5.7. Modeling of rapture ............................... 192 5.7.1. Constitutive equations ........................... 192 5.7.2. Modeling of material heterogenities ................... 195 5.7.3. Role of heterogenities ........................... 195 5.7.4. Modeling size effect ............................ 196 5.7.5. Comparison with experimental results ................. 197 5.8. Conclusion .................................... 201 5.9. References .................................... 201 Chapter 6. Low-Cycle Fatigue at Room Temperature ............. 209 Iris ALVAREZ-ARMAS 6.1. Introduction .................................... 209 6.2. Cyclic hardening/softening process ...................... 210 6.2.1. Basic characteristics of cyclic deformation ............... 210 6.2.2. Analysis and presentation of results ................... 211 6.3. Uniaxial cyclic plasticity in DSSs ....................... 219 6.3.1. First generation: low-nitrogen DSS ................... 220 6.3.2. Second generation: standard and high-alloyed DSS ......... 223 6.3.3. Third generation: superduplex ...................... 225 6.3.4. Role of nitrogen alloying in DSS ..................... 229 6.3.5. Behavior of the friction stress during cycling and its influence on the cyclic softening ............................... 234 6.4. Final remarks ................................... 236 6.5. Acknowledgments ................................ 237 6.6. References .................................... 237 Chapter 7. Multiaxial Low-Cycle Fatigue Behavior at Room Temperature ....................................... 241 Suzanne DEGALLAIX-MOREUIL 7.1. Introduction .................................... 241 7.2. Multiaxial LCF - introduction ......................... 242 7.2.1. Multiaxial LCF: specimens and tests .................. 242 7.2.2. Definitions .................................. 243 7.2.3. Study procedure ............................... 245 7.2.4. Multiaxial LCF lives ............................ 245 7.2.5. Presentation of the results ......................... 246 7.2.6. History effect ................................ 246 7.2.7. Ratcheting behavior ............................ 246 7.3. Biaxial LCF ofa DSS type 25-07....................... 248 7.3.1. Introduction ................................. 248 Table of Contents ix 7.3.2. Material, specimens, and testing equipment .............. 248 7.3.3. LCF test conditions ............................. 251 7.3.4. Multiaxial cyclic behavior ......................... 253 7.3.5. Multiaxial LCF lives ............................ 260 7.3.6. Ratcheting behavior ............................ 261 7.3.7. Microstructural evolutions in multiaxial LCF............. 264 7.4. Conclusions .................................... 270 7.5. Acknowledgments ................................ 270 7.6. References .................................... 270 Chapter 8. Partition of Cyclic Plasticity in the ISCr-TNWUSN Duplex Stainless Steel Investigated by Atomic Force Microscopy ........... 275 Jean-Bernard VOGT, Daniel SALAZAR and Ingrid PRORIOL SERRE 8.1. Introduction .................................... 275 8.2. Material ...................................... 277 8.3. Experimental procedure ............................ 278 8.3.1. Fatigue testing ................................ 278 8.3.2. AFM ..................................... 279 8.3.3. SEM...................................... 280 8.4. Cyclic behavior at a low strain range ..................... 280 8.4.1. Methodology ................................ 280 8.4.2. Qualitative analysis of the surface relief after fatigue ........ 281 8.4.3. Influence of heat treatment on the population of austenite grains involved in the plastic activity ...................... 283 8.4.4. Estimation of the irreversible plastic deformation from AFM measurements .................................... 285 8.4.5. Concluding remark ............................. 289 8.5. Cyclic behavior at a high strain range .................... 289 8.5.1. Identification of slip markings ...................... 289 8.5.2. Relief evolution with cycling ....................... 292 8.5.3. Role of crystallographic parameters ................... 296 8.5.4. Role of phase distribution on plasticity activity of the ferrite .... 298 8.5.5. Concluding remarks ............................ 300 8.6. Conclusions .................................... 300 8.7. References .................................... 300 Chapter 9. Macro- and Micromodeling of the Monotonie and Cyclic Mechanical Behavior of a Forged DSS ....................... 303 Véronique AUBIN and Pierre EVRARD 9.1. Introduction .................................... 303 9.2. Macroscopic modeling of the mechanical behavior ............ 304 9.2.1. Thermodynamic frame ........................... 304 x Duplex Stainless Steels 9.2.2. General formulation of constitutive laws for the description ofelasto-plastic mechanical behavior ...................... 305 9.2.3. Basis model ................................. 307 9.2.4. Modeling of the over-hardening ..................... 313 9.2.5. Conclusion .................................. 318 9.3. Micromechanical modeling .......................... 318 9.3.1. Introduction ................................. 318 9.3.2. Representation of the material ...................... 319 9.3.3. Localization step .............................. 321 9.3.4. Grain constitutive law ........................... 322 9.3.5. Homogenization step ............................ 324 9.3.6. Identification of model parameters .................... 324 9.3.7. Bi-phased polycrystalline model validation .............. 326 9.3.8. Modeling of the cyclic softening ..................... 329 9.3.9. Conclusion .................................. 332 9.4. General conclusion ............................... 332 9.5. References .................................... 334 Chapter 10. Low-Cycle Fatigue at Intermediate Temperatures ....... 339 Alberto F. ARMAS 10.1. Introduction ................................... 339 10.2. Materials studied ................................ 342 10.3. UNS S32900 DSS ............................... 345 10.3.1. Unaged (as-received) steel ........................ 345 10.3.2. Aged steel ................................. 349 10.4. UNS S32750 SDSS .............................. 352 10.4.1. Unaged steel ................................ 352 10.4.2. Aged SDSS ................................. 355 10.5. Temperature influence on the fatigue life ................. 361 10.6. Final remarks .................................. 363 10.7. Acknowledgments ............................... 364 10.8. References .................................... 364 Chapter 11. Industrial Processing and Fatigue Response of DSSs ...... 367 NuriAKDUT 11.1. Introduction ................................... 367 11.2. Morphological aspects ............................ 369 11.3. The role of morphological texture on the fatigue response ....... 372 11.3.1. The role of the fatigue axis direction .................. 372 11.3.2. The role of the morphological texture and scale ........... 373 11.4. The role of nitrogen-content on the fatigue response of DSSs ..... 375 11.4.1. Nitrogen and its effect on the SFE in the austenite ......... 379 Table of Contents xi 11.4.2. The effect of nitrogen on the fatigue lives of DSSs ......... 381 11.5. Cyclic plasticity and fatigue of nitrogen-alloyed DSSs - effects of cyclic softening .................................. 383 11.5.1. Plastic strain-controlled cyclic deformation ............. 385 11.5.2. The effect of the cyclic deformation mode and nitrogen- content on cyclic softening ............................ 387 11.5.3. Cyclic stress-strain response of DSSs ................. 390 11.5.4. Fatigue lives of DSSs as a function of phase morphology and nitrogen content ................................ 392 11.6. Summary and conclusions .......................... 395 11.7. References .................................... 396 Chapter 12. Applications ................................ 403 Mats LILJAS and Fredrik SJÖHOLM 12.1. Introduction ................................... 403 12.2. Historical review ................................ 404 12.3. Current (modern) DSS grades ........................ 408 12.4. Modern applications .............................. 409 12.4.1. Oil and gas ................................. 410 12.4.2. Pulp and paper ............................... 412 12.4.3. Desalination ................................ 414 12.4.4. Transport .................................. 416 12.4.5. Storage tanks ................................ 417 12.4.6. Hydrometallurgy ............................. 418 12.4.7. Pollution control/flue gas cleaning ................... 419 12.4.8. Construction ................................ 420 12.4.9. Hot-water boilers ............................. 421 12.5. Conclusions ................................... 422 12.6. References .................................... 422 Appendix .......................................... 425 List of Authors ...................................... 429 Index ............................................ 433 Duplex Stainless Steels (DSSs) are chromium-nickel-molybdenunn-iron alloys that are usually created in proportions optimized for equalizing the volume fractions of austenite and ferrite crystalline components. Due to their ferritic-austenitic microstructure, they possess a higher mechanical strength and a better corrosion resistance than standard austenitic steels. This type of steel has seen rapid increases in its application and market share due to its superior properties and relatively low cost. This book reviews the progress that has been made in the last 10 years in the areas of microstructure, corrosion resistance and mechanical properties, as well as applications, because of the development of new steel grades. Special attention is given to fatigue and fracture behavior, and to theoretical models of mechanical behavior. Each topic is addressed in chapters written by recognized experts from the international industrial and scientific communities. The use of duplex stainless steels has grown rapidly in the last 10 years, particularly in the oil and gas industry, chemical tankers, pulp and paper manufacturing, as well as in the chemical industry. In all these application areas, considerations such as weldability, corrosion resistance and mechanical strength properties (mainly in the fatigue domain) are crucial. The new information on welding and corrosion properties and the introduction of topics like texture effects, fatigue and fracture strength properties, and mechanical behavior modeling thus make this book especially important for researchers, designers, and engineers working in all these fields. Iris Alvarez-Armas is Director of Research at the Instituto de Física Rosario, Universidad Nacional de Rosario, Argentina. Suzanne Degallaix-Moreuil is Professor at the Laboratoire de Mécanique de Lille, Ecole Centrale de Lille, France. № WILEY www.iste.co.uk 781848 211377
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Duplex stainless steel
Nicht rostender Stahl (DE-588)4126143-4 gnd
subject_GND (DE-588)4126143-4
title Duplex stainless steels
title_auth Duplex stainless steels
title_exact_search Duplex stainless steels
title_full Duplex stainless steels ed. by Iris Alvarez-Armas ...
title_fullStr Duplex stainless steels ed. by Iris Alvarez-Armas ...
title_full_unstemmed Duplex stainless steels ed. by Iris Alvarez-Armas ...
title_short Duplex stainless steels
title_sort duplex stainless steels
topic Duplex stainless steel
Nicht rostender Stahl (DE-588)4126143-4 gnd
topic_facet Duplex stainless steel
Nicht rostender Stahl
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