Carbide Precipitation and SCC Behavior of Inconel Alloy 690

CORROSION ◽  
1988 ◽  
Vol 44 (5) ◽  
pp. 288-289 ◽  
Author(s):  
J. M. Sarver ◽  
J. R. Crum ◽  
W. L. Mankins
Keyword(s):  
Carbide Precipitation ◽  
Inconel Alloy ◽  
Alloy 690

INCONEL FILLER METAL 52

Alloy Digest ◽  
1992 ◽  
Vol 41 (9) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Arc Welding ◽  
Filler Metal ◽  
Pressurized Water Reactors ◽  
Pressurized Water ◽  
High Chromium ◽  
Inconel Alloy ◽  
Gas Tungsten Arc ◽  
Alloy 690 ◽  
Water Reactors

Abstract INCONEL FILLER METAL 52 is a high chromium filler metal for gas-metal-arc and gas-tungsten-arc welding of Inconel Alloy 690 (See Alloy Digest Ni-266, March 1981). Higher chromium is beneficial in resisting stress-corrosion cracking in high purity water for pressurized water reactors and for resistance to oxidizing acids. This datasheet provides information on composition and tensile properties. It also includes information on corrosion resistance as well as joining. Filing Code: Ni-412. Producer or source: Inco Alloys International Inc..

INCONEL WELDING ELECTRODE 152

Alloy Digest ◽  
1992 ◽  
Vol 41 (7) ◽  
Keyword(s):  
Arc Welding ◽  
Pressurized Water Reactors ◽  
Shielded Metal Arc Welding ◽  
Pressurized Water ◽  
High Chromium ◽  
Inconel Alloy ◽  
Metal Arc Welding ◽  
Alloy 690 ◽  
Water Reactors ◽  
Welding Electrode

Abstract INCONEL WELDING ELECTRODE 152 is a high chromium rod for shielded-metal-arc welding of Inconel Alloy 690 (Alloy Digest Ni-266, March 1981). Higher chromium is beneficial in resisting stress-corrosion cracking in high purity water for pressurized water reactors and for resistance to oxidizing acids. This datasheet provides information on composition and tensile properties. It also includes information on corrosion resistance as well as joining. Filing Code: Ni-406. Producer or source: Inco Alloys International Inc..

scholarly journals Inconel Alloy 690-A New Corrosion Resistant Material

1979 ◽  
Vol 28 (2) ◽  
pp. 82-95 ◽  
Author(s):  
A. J. Sedriks ◽  
J. W. Schultz ◽  
M. A. Cordovi
Keyword(s):  
Resistant Material ◽  
Corrosion Resistant ◽  
Inconel Alloy ◽  
Alloy 690

Interpretation of Carbide Precipitation and Chromium Concentration Distribution of Alloy 690

2013 ◽  
Vol 372 ◽  
pp. 84-87 ◽  
Author(s):  
Kwang Soon Jang ◽  
Da Som Park ◽  
Yong Jae Yu ◽  
Jeong Min Kim ◽  
Hyun Seong Noh ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Chromium Carbide ◽  
Concentration Distribution ◽  
Chromium Concentration ◽  
Nucleation Theory ◽  
Classical Nucleation Theory ◽  
Avrami Equation ◽  
Hydrogen Brittleness ◽  
Inconel Alloy ◽  
Alloy 690

Inconel alloy 690 which contains high chromium concentration, has replaced Inconel alloy 600 because of its high resistance of stress corrosion cracking (SCC). Inconel alloy 690 is an austenite nickel-based alloy and it has intergranular chromium carbide (M23C6). Alloy should be maintained to be nearly free from fretting wear, corrosion, and hydrogen brittleness for a several decades. Main factors controlling deterioration are initial chromium carbide size and their distribution along austenite grain boundary and chromium concentration distribution inside of grain. The precipitated carbide along grain boundary are modeled by KJMA(Kolmogorov-Johnson-Mehl-Avrami) equation. The model is based on the classical nucleation theory, and Cr diffusion controlled growth followed by coarsening. The distribution of the chromium concentration near grain boundary with time is based on diffusion of chromium. The simulated results are compared with the experiments from literatures to confirm the validity of model.

Oxidation Products in Inconel Alloys 600 and 690 Under Hydrogenated Steam Environments and Their Role in Stress Corrosion Cracking

2010 ◽  
Vol 1276 ◽  
Author(s):  
Hugo F. Lopez
Keyword(s):  
Crack Initiation ◽  
Oxidation Products ◽  
Alloy 600 ◽  
Initiation Mechanism ◽  
Water Steam ◽  
Inconel Alloy ◽  
Inconel Alloys ◽  
Alloy 690 ◽  
Gel Film ◽  
The Stability

AbstractThermodynamic considerations for the stability of Ni and Cr compounds developed under PWR environments (PH2O and PH2) are experimentally tested. In particular, the experimental outcome indicates that Ni(OH)2 and CrOOH are thermodynamically stable products under actual PWR conditions (T < 360°C and Pressures of up to 20 MPa). Accordingly, a mechanism is proposed to explain crack initiation and growth in inconel alloy 600 along the gbs. The mechanism is based on the existing thermodynamic potential for the transformation of a protective NiO surface layer into an amorphous non-protective Ni(OH)2 gel. This gel is also expected to form along the gbs by exposing the gb Ni-rich regions to H2 supersaturated water steam. Crack initiation is then favored by tensile stressing of the gb regions which can easily rupture the brittle gel film. Repeating the sequence of reactions as fresh Ni is exposed to the environment is expected to also account for crack growth in Inconel alloy 600. The proposed crack initiation mechanism is not expected to occur in alloy 690 where a protective Cr2O3 film covers the metal surface. Yet, if a pre-existing crack is present in alloy 690, crack propagation would occur in the same manner as in alloy 600.

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