9780470500217

The most up-to-date coverage of welding metallurgy aspects and weldability issues associated with Ni-base alloys Welding Metallurgy and Weldability of Nickel-Base Alloys describes the fundamental metallurgical principles that control the microstructure and properties of welded Ni-base alloys. It serves as a practical how-to guide that enables engineers to select the proper alloys, filler metals, heat treatments, and welding conditions to ensure that failures are avoided during fabrication and service. Chapter coverage includes: Alloying additions, phase diagrams, and phase stability Solid-solution strengthened Ni-base alloys Precipitation strengthened Ni-base alloys Oxide dispersion strengthened alloys and nickel aluminides Repair welding of Ni-base alloys Dissimilar welding Weldability testing High-chromium alloys used in nuclear power applications With its excellent balance between the fundamentals and practical problem solving, the book serves as an ideal reference for scientists, engineers, and technicians, as well as a textbook for undergraduate and graduate courses in welding metallurgy.

Introduction
Ni-base Alloy Classification
Commercially Pure Nickel
Solid-Solution Strengthened Alloys
Precipitation-strengthened Alloys
Other Specialty Alloys
History of Nickel and Ni-base Alloys
Corrosion Resistance
Nickel Alloy Production
Alloying Additions, Phase Diagrams, and Phase Stability
Introduction
General Influence of Alloying Additions
Phase Diagrams for Solid-Solution Alloys
Ni-Cu System
Ni-Cr System
Ni-Mo System
Ni-Fe-Cr System
Ni-Cr-Mo System
Phase Diagrams for Precipitation-Strengthened Alloys - ¿' Formers
Phase Diagrams for Precipitation-Strengthened Alloys - ¿" Formers
Calculated Phase Stability Diagrams
PHACOMP Phase Stability Calculations
Solid-Solution Strengthened Ni-base Alloys
Standard Alloys and Consumables
Physical Metallurgy and Mechanical Properties
Welding Metallurgy
Microstructural Evolution in the Fusion Zone
Interfaces in Single Phase Austenitic Weld Metal
Solidification Subgrain Boundaries
Solidification Grain Boundaries
Migrated Grain Boundaries
Elemental Segregation during Solidification
Phase Transformation Sequence
Heat-Affected Zone
Postweld Heat Treatment
Stress Relief Heat Treatments
Homogenization of Weld Metal Microstructure
Mechanical Properties of Weldments
Hydrogen Effects
Postweld Heat Treatment
Weldability
Fusion Zone Solidification Cracking
HAZ Liquation Cracking
Avoiding Solidification and Liquation Cracking
Ductility-Dip Cracking
Description of Ductility-Dip Cracking
Proposed Mechanisms for Ductility-Dip Cracking
Ductility-Dip Cracking in Ni-base Weld Metals
Avoiding Ductility-Dip Cracking
Corrosion Resistance
Case Studies
Pitting Corrosion in Monel Welds
Precipitation Strengthened Ni-base Alloys
Standard Alloys and Consumables
Physical Metallurgy and Mechanical Properties
Welding Metallurgy
Microstructural Evolution in the Fusion Zone
Elemental Segregation during Solidification
Phase Transformations - ¿' Formation
Phase Transformations - Carbide Formation
Phase Transformations - ¿" Formation
Effect of Nb and C
Fusion Zone Microstructure Predictions using New PHACOMP
Heat-Affected Zone
Postweld Heat Treatment
Mechanical Properties of Weldments
Weldability
Solidification Cracking
Effect of Minor Element Additions - B and Zr
Effect of Nb Additions
Cast Pin Tear Test Results
Summary of Solidification Cracking
HAZ Liquation Cracking
Composition Effects
Effect of Grain Size
Effect of Heat Treatment
Effect of Thermal Stress/Strain
Summary of HAZ Liquation Cracking
Strain-Age Cracking
Mechanism fro Strain-Age Cracking
Effect of Residual, Thermal and Aging Stresses and Joint Restraint
Composition Effects
Grain Size
Preweld Condition of the Base Metal
Effect of Welding Procedure
Effect of Postweld Heat Treatment
Summary of Strain-Age Cracking
Oxide Dispersion Strengthened Alloys and Nickel Aluminides
Oxide Dispersion Strengthened Alloys
Physical and Mechanical Metallurgy
Welding Metallurgy
Summary of the Weldability of ODS Alloys
Nickel Aluminide Alloys
Physical and Mechanical Metallurgy
Weldability of the Ni-Aluminides
Elevated Temperature Cracking
Hot Ductility Behavior
Brazing
Summary of the Weldability of Nickel Aluminide Alloys
Repair Welding of Ni-base Alloys
Solid-Solution Strengthened Alloys
Precipitation Strengthened Alloys
Alloy 718
Effect of Ë-phase Formation
Rejuvenation Heat Treatments
Summary of the Repair Weldability of Alloy 718
Waspaloy
Single Crystal Superalloys
Control of Single Crystal Weld Repairs
Solidification Cracking
Optimizing Processing Parameters
Dissimilar Welding
Application of Dissimilar Welds
Influence of Process Parameters on Fusion Zone Composition
Carbon, Low Alloys, and Stainless Steels
Determining Weld Metal Constitution
Fusion Boundary Transition Region
Weldability
Solidification Cracking
Clad Disbonding
Creep Failure in the HAZ
Postweld Heat Treatment Cracking
Postweld Heat Treatment Cracking in Stainless Steels Welded with Ni-base Filler Metals
Super Austenitic Stainless Steels
Dissimilar Welds in Ni-base Alloys - Effect on Corrosion Resistance
9%Ni Steels
Physical Metallurgy of 9%Ni Steels
Hot Cracking of Ni-base Deposits
Superduplex Stainless Steels
Case Studies
PWHT Cracking of Thick Section Welds in Alloy 800H made with ENiCrFe-2 Filler Metal
Alloy 925 Welded with ERNiCrMo-15 (INCO-WELD 725NDUR) for Manufacturing Vacuum Insulated Oil Patch Tubing
Corrosion-Fatigue of Alloy 625 Weld Overlays
Overlay of "Safe-End" Welds using High-Cr, Ni-base Filler Metals
Weldability Testing
Introduction
Weldability Testing Approaches
Types of Weldability Test Techniques
The Varestraint Test
Technique for Quantifying Weld Solidification Cracking
Technique for Quantifying HAZ Liquation Cracking
Modified Cast Pin Tear Test
The Sigmajig Test
The Hot Ductility Test
The Strain-to-Fracture Test
Other Weldability Tests
Appendices
Composition of Wrought and Cast Ni-base Alloys
Composition and Application of Nickel Alloy Consumables
Corrosion Acceptance Testing Methods
Etching Techniques for Ni-base Alloys and Welds
Table of Contents provided by Publisher. All Rights Reserved.

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Welding Metallurgy and Weldability of Nickel-Base Alloys

0470500212

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