Fracture Toughness And Microstructural Studies Of Submerged-Arc Welds For Offshore Structures

1978 ◽  
Author(s):  
M.S. Kamath ◽  
D.J. Abson ◽  
J.G. Garland
Keyword(s):  
Fracture Toughness ◽  
Offshore Structures ◽  
Submerged Arc ◽  
Microstructural Studies

METRODE 20.70 Nb

Alloy Digest ◽  
2003 ◽  
Vol 52 (4) ◽  
Keyword(s):  
Fracture Toughness ◽  
Tensile Properties ◽  
Arc Welding ◽  
Nickel Alloys ◽  
Submerged Arc Welding ◽  
Inert Gas ◽  
Nominal Composition ◽  
Oxidation Resistant ◽  
Nickel Base ◽  
Submerged Arc

Abstract Metrode 20.70 Nb is a nickel-base consumable with a nominal composition of Ni, 20% Cr, and 2.5% Nb. This alloy is used to join a variety of oxidation-resistant nickel alloys. The product is a solid wire for tungsten inert gas (TIG), metal inert gas (MIG), and submerged arc welding (SAW). This datasheet provides information on tensile properties as well as fracture toughness. It also includes information on joining. Filing Code: Ni-606. Producer or source: Metrode Products Ltd.

Scaling of Pop-Ins During Brittle Fracture Testing

2019 ◽  
Author(s):  
O. J. Coppejans ◽  
C. L. Walters
Keyword(s):  
Fracture Toughness ◽  
Analytical Method ◽  
Offshore Structures ◽  
Specimen Size ◽  
Small Scale ◽  
Unstable Fracture ◽  
Displacement Curve ◽  
Fracture Toughness Test ◽  
Key Factor

Abstract Measurement of the fracture toughness of steel is important for the assurance of the safety of ships and offshore structures, especially when these structures are made of thick sections and/or applied in cold environments. One key factor that will affect the determination of the fracture toughness is a pop-in, which is a short event in which unstable fracture is initiated and then self-arrests. If the pop-in is large enough, it will be used to calculate the fracture toughness. Pop-ins are believed to be the products of local brittle zones, which occur randomly at crack tips and have finite sizes. Fracture toughness testing codes have ways of determining whether a pop-in is critical (thus, identifying the maximum force and displacement to be used in the determination of the toughness of the material) or not important (thus, allowing for the test to proceed). In an ongoing project on the use of small-scale fracture specimens to predict standard fracture toughness test results, we would like to know how pop-in acceptance criteria should be scaled for specimen size. It is expected that the physical size of the brittle zones that cause pop-ins is invariant of specimen size, meaning that the contribution of the pop-in will be proportionally more important for smaller specimens. An analytical method for relating the pop-ins on one specimen size to another specimen size is developed. This method is partially verified by observations on the size of a local brittle zone observed on a fracture surface and the effect of that pop-in on the force-displacement curve during a CTOD test. The analytical method showed that an equivalent pop-in for a small-scale specimen is indeed larger, but that the effect was subtle.

RIMA 625 (62-50)

Alloy Digest ◽  
2003 ◽  
Vol 52 (1) ◽  
Keyword(s):  
Fracture Toughness ◽  
Corrosion Resistance ◽  
Arc Welding ◽  
Base Alloy ◽  
Submerged Arc Welding ◽  
Inert Gas ◽  
Nickel Base Alloy ◽  
Typical Composition ◽  
Nickel Base ◽  
Submerged Arc

Abstract RIMA 625, or 62-50, is a consumable or solid wire for tungsten inert gas (TIG), metal inert gas (MIG), and submerged arc welding (SAW). The consumable is used for matching the nickel-base alloy 625 or N06625 (see Alloy Digest Ni-121, February 1967) with typical composition Ni-20%Cr-9%Mo-3.5%Nb. The product is also used as an overmatched product with respect to corrosion resistance for alloys 825, G, G3, Alloy 28, 904L and the 6% Mo group of materials. This datasheet provides information on composition, hardness, and tensile properties as well as fracture toughness. It also includes information on corrosion resistance as well as machining and joining. Filing Code: Ni-599. Producer or source: Metrode Products Ltd.

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