Electrochemical Behavior and Its Relation to Composition and Sensitization of NiCrMo Alloys in ASTM G-28 Solution

Heubner, U.; Altpeter, E.; Rockel, Manfred B.; Wallis, E.

doi:10.5006/1.3577851

Cited by 39 publications

(27 citation statements)

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“…The TTT diagram of Figure 3-4 is similar to that published by Heubner et al (1989). In this study, the boundary for the onset of precipitation is shifted slightly to lower temperatures and shorter times probably because it is easier to see the beginning of precipitation at grain boundaries in a SEM than in an optical microscope, which is what was used by Heubner et al (1989).…”

Section: Discussionsupporting

confidence: 67%

“…In this study, the boundary for the onset of precipitation is shifted slightly to lower temperatures and shorter times probably because it is easier to see the beginning of precipitation at grain boundaries in a SEM than in an optical microscope, which is what was used by Heubner et al (1989). The curve in Figure 3-4 for the beginning of bulk precipitation begins at longer times than in Heubner's diagram.…”

Section: Discussionmentioning

confidence: 86%

“…These phases tend to be rich in either MO or Cr, which are the elements that give C-22 alloy its excellent corrosion resistance. Precipitation of these phases leads to local Cr and MO depletion, which can cause an increased susceptibility to localized corrosion (Leonard 1969, Hodge 1973, Tawancy et al 1983, Heubner et al 1989, Tawancy 1996and 1980. At lower temperatures (below approximately 6OO"C), long-range ordering has been observed to occur in Ni-Cr-Mo alloys (Tawancy et al 1983, Tawancy 1996and 1980, Rebak and Koon 1998, and Summers et al 1998.…”

mentioning

confidence: 99%

“…Hodge (1973) measured volume fraction of precipitation in C-276, a Ni-Cr-Mo alloy similar to C-22 alloy with nominally 16% Cr, 16% MO, 4% W, 5% Fe, and found the activation energy to be 260 kJ/mol (62 kcal/mol). Heubner et al (1989) looked at aged C-22 alloy samples optically and produced a Time-Temperature-Transformation (TTT) diagram, but it was not within the scope of that paper to extrapolate the kinetics of precipitation to lower temperatures. The preliminary results presented here are a first attempt at measuring the kinetics of intermetallic precipitation in C-22 alloy.…”

mentioning

confidence: 99%

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Prediction of the Lifetime Integrity of a Nuclear Waste Container Material Based on Thermal Stability Studies

Rebak

Shen

Summers

2001

Ageing Studies and Lifetime Extension of Materials

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The kinetics of precipitation in C-22 alloy (UNS N06022) was estimated through isothermal aging experiments at temperatures ranging from 427°C to 800°C for times up to 40,000 h. The phases that formed, at least after the longer aging times, were identified by transmission electron microscopy (TEM).Aged samples were also examined using scanning electron microscopy (SEM) to determine when precipitation began on grain boundaries, completely covered grain boundaries, and began forming within the grains. This data was used to evaluate the kinetics of precipitation at lower temperatures using a simple exponential temperature dependende. The corrosion resistance of aged samples was investigated using the ASTM Specification G28B technique. The time to cause a significant increase in corrosion rate was also determined as a function of temperature and was fit to an exponential temperature dependence. Preliminary results indicate that C-22 alloy base metal would remain a highly corrosion resistant, single-phase material for greater than 10,000 years at temperatures below approximately 300°C.

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Section: Discussionsupporting

confidence: 67%

Section: Discussionmentioning

confidence: 86%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Prediction of the Lifetime Integrity of a Nuclear Waste Container Material Based on Thermal Stability Studies

Rebak

Shen

Summers

2001

Ageing Studies and Lifetime Extension of Materials

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“…Other nickel base alloys containing 13 to 16 % MO show similar behaviour [21], whereas in several molybdenum-free grades (alloys 600, 690, 800, X-750, etc. ), the sensitivity decreases with time, and disappears after 10 to 20 hours at around 700°C.…”

Section: Corrosion Resistancementioning

confidence: 98%

Mechanical Properties, Corrosion Resistance and Microstructure of Both Regular and Titanium Hardened 625 Alloys

Cozar¹,

Rouby²,

Mayonobe³

et al. 1991

Superalloys 718, 625 and Various Derivatives (1991)

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The addition of titanium to standard 625 grade enhances the age-hardening response, enabling yield strengths greater than 800 MPa to be obtained by simple, industrially compatible, heat treatments. The effect of such treatments on microstructure have been studied, together with their influence on the strength/toughness trade-off and the resistance to intergranular corrosion, compared to regular 625 alloy.

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Localized Corrosion

Shifler

2022

LaQue's Handbook of Marine Corrosion

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Electrochemical Behavior and Its Relation to Composition and Sensitization of NiCrMo Alloys in ASTM G-28 Solution

Cited by 39 publications

References 0 publications

Prediction of the Lifetime Integrity of a Nuclear Waste Container Material Based on Thermal Stability Studies

Prediction of the Lifetime Integrity of a Nuclear Waste Container Material Based on Thermal Stability Studies

Mechanical Properties, Corrosion Resistance and Microstructure of Both Regular and Titanium Hardened 625 Alloys

Localized Corrosion

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