TAILIEUCHUNG - Ebook Welding metallurgy and weldability of nickel-base alloys: Part 2

(BQ) Part 2 book "Welding metallurgy and weldability of nickel-base alloys" has contents: Oxide dispersion strengthened alloys and nickel aluminides, repair welding of ni base alloys, dissimilar welding, dissimilar welding. | CHAPTER 5 Oxide Dispersion Strengthened Alloys and Nickel Aluminides The oxide dispersion strengthened alloys and nickel aluminides represent two specialty groups of Ni-base alloy that have been developed for demanding service environments, normally requiring good corrosion and creep resistance at elevated temperature. The oxide dispersion strengthened alloys are produced using a mechanical alloying process that uses a ball mill to mechanically mix the metal and oxide species. This mixture is then formed and heat-treated to develop the necessary mechanical properties. Nickel aluminides are based on either the NiAl the Ni3Al intermetallic system. Both these intermetallic alloys are quite strong and considerably lighter than conventional Ni-base superalloys because of the high volume fraction of aluminum, but they have negligible ductility and toughness. Because of the desirable strength-to-weight ratio, both the ODS and nickel aluminide alloys are of great interest to the aerospace turbine engine industry. Not surprisingly, these alloys have some unique weldability issues as described in this chapter. OXIDE DISPERSION STRENGTHENED ALLOYS Physical and Mechanical Metallurgy Ni-base oxide dispersion strengthened (ODS) alloys utilize a fine dispersion of insoluble oxide particles as their primary strengthening agent. Because the oxide particles are insoluble, these materials must be prepared with mechanical alloying techniques using a powder metallurgy route. The first step is to mix individual powders in a ball mill that consist of an oxide powder (typically yttria—Y2O3) along with powders of Ni, Cr, and a master alloy that contains additional elements. The oxide particles exhibit very fine particle diameters on the order of 25–50 nm (– μm). During mixing within the grinding balls, repeated deformation, fracture, and cold welding occurs to produce Welding Metallurgy and Weldability of Nickel-Base Alloys, by John N. DuPont, John C. Lippold, and .

• Cơ khí - Chế tạo máy
• Welding metallurgy
• WWeldability of nickel base alloys
• Oxide dispersion strengthened alloys
• Nickel aluminides
• Repair welding of ni base alloys
• Dissimilar welding
• Dissimilar welding
• Welding metallurgy and weldability
• Welding metallurgy principles
• Hot cracking
• Solid state cracking
• Heat flow in welding
• Fusion welding processes
• Chemical reactions in welding
• Residual stresses
• Grain structure
• Hydrogen Induced cracking
• Fracture and fatigue
• Failure analysis
• Weldability testing
• Weldability of nickel
• Alloying additions
• Phase diagrams
• Phase stability
• Solid solution strengthened ni base alloys
• Mechanical properties
• Post solidification phase transformations
• Weld metal chemical inhomogeneities
• Formation of the partially melted zone
• Difficulties associated
• curriculum technology manufacturing
• mechanical
• mechanical dynamics
• drivetrain
• air distribution structure
• welding
• coating metallurgy
• Dissimilar metal welding
• Welding parameters
• Fusion zone
• Process parameters on microstructures
• Establishing the process parameters of linear friction welding process
• Linear friction welding process for dissimilar joints
• Linear friction welding process
• Finite element analysis
• Friction stir welding
• Dissimilar Al Cu joint
• Friction stir welding method
• Micro cracks formed
• Solid state joining method
• Nuclear engineering and technology
• Residual stress in welding of dissimilar metals
• Nuclear power plants using cascaded support vector regression
• Cascaded support vector regression
• Primary Water Stress Corrosion Cracking
• Optimization of process parameters for friction Stir welding
• Dissimilar Aluminum alloys
• AA2024 T6 and AA6351 T6
• AA2024 T6 by using Taguchi method
• AA6351 T6 by using Taguchi method
• Journal of Science and Technology
• Dissimilar joining A6061 aluminum
• Sus304 stainless steel
• The tungsten inert gas welding process
• Scanning electron microscopy
• Friction stir lap welding
• The interface structure
• The formation of interface structure
• Al Ti FSL welds
• Tungsten Inert Gas (TIG) welding
• Weld bead and Heat affected zone
• Tungsten Inert Gas
• The vibratory parameters
• The Vibratory welding
• Welding dissimilar materials
• Residual stress
• Welding deformation
• Butt welded joint
• Stainless steel welding
• Mechanical strength of FSL welds
• Engineering Solid Mechanics
• Mix stir zone forms
• Al–Cu interface layer forms
• friction stir welding parameters
• Tool pin profile
• Analysis of variance
• Ultimate tensile strength
• Grey relational analysis