An Auger Electron Spectroscopic Study of Phosphorus Segregation in the Grain Boundaries of Nickel Base Alloy 600

CORROSION ◽  
1981 ◽  
Vol 37 (7) ◽  
pp. 416-425 ◽  
Author(s):  
M. Guttmann ◽  
Ph. Dumoulin ◽  
Nguyen Tan-Tai ◽  
P. Fontaine
Keyword(s):  
Grain Boundaries ◽  
Stress Corrosion ◽  
Auger Electron ◽  
Base Alloy ◽  
Pure Water ◽  
Alloy 600 ◽  
Nickel Base Alloy ◽  
Phosphorus Segregation ◽  
Virtual Absence ◽  
Nickel Base

Abstract The grain boundary composition of nickel base alloy 600 has been studied by means of Auger electron spectroscopy. After being cathodically charged with hydrogen in a water saturated salt bath at 200 C, all the specimens could be intergranularly fractured in the Auger chamber. Phosphorus was the only element found to segregate at the grain boundaries of the two materials studied in all conditions of heat treatment considered; sulfur appeared essentially as a contaminant, which built up on the surfaces after fracture. The segregation of P was shown to be of the equilibrium (McLean) type, whereas Si did not segregate appreciably to the grain boundaries. The results, discussed in connection with published corrosion and stress corrosion data, explain the influence of P and the virtual absence of influence of Si on the sensitivity of alloy 600 to intergranular corrosion in HNO3 + Cr6+ solutions. They also indicate that the segregation of P is not the cause of intergranular stress corrosion cracking of this alloy in pure water and caustic environment, and that hydrogen embrittlement is very unlikely to be the mechanism of this phenomenon.

Deformation, Recovery and Stress Corrosion Cracking of Nickel-Base Alloy 600 by X-ray Rocking-Curve Measurements

1989 ◽  
Vol 33 ◽  
pp. 33-53
Author(s):  
Chi Fung Lo ◽  
Gajiang Feng ◽  
William E. Mayo ◽  
Sigmund Weissmann
Keyword(s):  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Defect Structure ◽  
Base Alloy ◽  
Corrosion Cracking ◽  
Alloy 600 ◽  
Nickel Base Alloy ◽  
Rocking Curve ◽  
X Ray ◽  
Nickel Base

AbstractThe aim of this investigation was the establishment of a quantitative link between micro and macrodeformation and kinetic recovery of nickel-base Alloy 600 as well as the early detection of microcracks in this alloy when exposed to stress corrosion. To reach these objectives, X-ray rocking-curve measurements were carried out using the method known by its acronym CARCA (computer-aided rocking-curve analysis). Supported by transmission electron microscopy, a calibration curve was established relating dislocation density, X-ray rocking-curve halfwidth and strain. Applying CARCA, deformation levels and work-hardening characteristics of the alloys were measured by quantitative characterization of the induced defect structure. By correlating the analysis of the defect structure to the kinetic recovery of the alloys, including determination of the activation energies, it was possible to infer from the thermal stability of the alloys the dislocation obstacles responsible for hardening at different strain levels. It was shown that the recovery of the alloys was conditioned by their low stackingfault energy and that it depended on the strain level. Rapid recovery associated with grain boundary diffusion occurred at very small plastic strains up to about 0.7% with measured activation energies of recovery of about 25.6 Kcal/mol. At higher strains bulk diffusion was necessary to overcome the obstacles by dislocation climb with Q — 67 kcal/mol, The CARCA method proved itself to be a valuable research tool for assessing quantitatively the defect density and the mechanically and thermally induced changes. Relaxation effects, recorded by CARCA in the apex region of stressed C-rings exposed to a caustic medium, may open a path for early nondestructive detection of microcracks in stress-corrosion cracking.

SANDVIK SANICRO 41

Alloy Digest ◽  
1996 ◽  
Vol 45 (3) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Physical Properties ◽  
Stress Corrosion ◽  
Tensile Properties ◽  
Base Alloy ◽  
Heat Treating ◽  
Nickel Base Alloy ◽  
Resistance To Stress ◽  
Nickel Base

Abstract Sandvik Sanicro 41 is an austenitic nickel-base alloy with excellent resistance to reducing acids, has better pitting resistance than Type 316SS, and has excellent resistance to stress-corrosion in chlorides and downhole environments. This datasheet provides information on composition, physical properties, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, and joining. Filing Code: Ni-505. Producer or source: Sandvik.

NICKEL 600

Alloy Digest ◽  
1985 ◽  
Vol 34 (1) ◽  
Keyword(s):  
Nickel Alloy ◽  
Food Processing ◽  
Base Alloy ◽  
Heat Treating ◽  
Alloy 600 ◽  
Nickel Base Alloy ◽  
Resistance To Oxidation ◽  
Wide Range ◽  
Petroleum Chemical ◽  
Nickel Base

Abstract Nickel Alloy 600 is a nickel-base alloy intended for use in a wide range of applications from cryogenic to temperatures above 2000 F, where high-temperature properties and resistance to oxidation or corrosion are desired. This alloy has been used in nuclear, petroleum, chemical, food-processing, pharmaceutical and heat-treating industries. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: Ni-309. Producer or source: Nickel alloy producers.

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