Creep Rupture Properties of Ni-26 Cr-17 W Alloys with Small amount of B and/or Zr

The present paper investigates creep crack growth behavior in Ni-base superalloys, i.e., Ni-26%Cr-17%W-0.5%Mo alloys, at 1,273K in a He gas environment. The alloys have been developed as candidate structural materials for heat exchangers in Japanese high-temperature gas-cooled reactors (HTGRs) and shown to have good creep resistance.Creep crack growth tests were made on the alloys having different carbon contents in a simulated HTGR He gas environment. Tests were also made in a low vacuum for a comparison purpose. Creep crack growth rate dajdt was evaluated by the fracture mechanics parameter C*. The addition of carbon suppresses the load-line deflection in the primary and secondary stages of creep in the present alloys, whereas it accelerates the deflection rate in the final stage. The dajdt vs. C* diagrams revealed that, in the He gas, dajdt was much faster in the carbon-added alloy than in the non-carbon-added one. This may be attributed to drastic increase in creep ductility in the He gas. The results also showed that the He gas environment accelerated dajdt, especially in higher C* range; nevertheless, this environmental effect was smaller than the effect of carbon-addition.

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“…The Ni-26%Cr-17%W-0.5%Mo alloys have been developed as candidate structural materials for heat exchangers in Japanese HTGRs (1) (2).…”

Section: Introductionmentioning

confidence: 99%

Creep Crack Growth Behavior in Ni-Base Superalloys in 1,273 K Helium Gas Environment

Nakasone¹,

Hiraga²,

Tanabe³

1992

Journal of Nuclear Science and Technology

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Effect of carbon content and helium gas environment on creep crack growth properties of Ni-26 pct Cr-17 pct W-0.5 pct Mo alloy at 1273 K

Tabuchi

Nakasone

Ohba

et al. 1995

Metall Mater Trans A

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Optimum alloy compositions in reduced-activation martensitic 9Cr steels for fusion reactor

Abe¹,

Noda²,

Okada³

1992

Journal of Nuclear Materials

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Creep Rupture Properties of Ni-26 Cr-17 W Alloys with Small amount of B and/or Zr

Cited by 5 publications

References 4 publications

Creep Crack Growth Behavior in Ni-Base Superalloys in 1,273 K Helium Gas Environment

Creep Crack Growth Behavior in Ni-Base Superalloys in 1,273 K Helium Gas Environment

Effect of carbon content and helium gas environment on creep crack growth properties of Ni-26 pct Cr-17 pct W-0.5 pct Mo alloy at 1273 K

Optimum alloy compositions in reduced-activation martensitic 9Cr steels for fusion reactor

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