Trace element effects on ductility and fracture of Ni-Cr-Ce alloys

Cosandey, F.; Kandra, J.T.

doi:10.1007/bf02647193

Cited by 11 publications

(2 citation statements)

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“…Zr was added at a 0.1 at % level because o f the excellent oxidation resistance of NiAl-O.1Zr ( 4 ) . Both dopants are known getters of 0 and S and consequently help prevent creep cavitation (5). Boron is well known to eliminate low temperature intergranular fracture in Ni3A1 (6).…”

Section: Introductionmentioning

confidence: 99%

Oxidation behavior of FeAl+Hf, Zr, B

1990

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Section: Introductionmentioning

confidence: 99%

Oxidation behavior of FeAl+Hf, Zr, B

1990

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“…Rare earth metals (REMs) are significantly utilised as refining and microalloying elements to improve the high temperature properties of steels and superalloys, such as oxidation resistance, hot workability, ductility and creep rupture. [1][2][3][4] Meanwhile, numerous investigations have revealed that minor elements, such as phosphorus, sulphur, boron and zirconium, can greatly affect the microstructure and solidification behaviour in different Fe and Ni based superalloys. [5][6][7][8] However, the effect of REM on the solidification behaviour in Ni based superalloys remains to be clearly known.…”

Section: Introductionmentioning

confidence: 99%

Effect of rare earth metals on solidification behaviour in nickel based superalloy

Pan

et al. 2012

Materials Science and Technology

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The effect of rare earth metals (REMs) on the microstructure and segregation during solidification in a highly alloyed Ni based superalloy was investigated. Rare earth metals considerably decrease the amounts of coarse columnar grains and increase the amounts of equiaxed grains. They are segregated to the interdendritic regions mainly as the precipitate of Ni5Ce. Both the dimension and distribution of γ′ particles and MC carbide are modified by REM. Eutectic ( γ+ γ′), Laves phase, δ phase and σ phase are precipitated in the interdendritic regions because of the serious segregation of niobium and titanium aggravated by REM. The differential thermal analysis indicates that the precipitation temperature of phases and the solidification sequence of the superalloy can be changed due to the additions of REM.

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Review of Trace Element Effects on High-Temperature Fracture of Fe- and Ni-Base Alloys

George¹,

Kennedy²,

Pope³

1998

phys. stat. sol. (a)

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Trace elements can have harmful or beneficial effects on elevated‐temperature mechanical properties. In iron and low‐alloy steels, S at high concentrations forms sulfides which are potent nucleation sites for intergranular creep cavities. As a result, ductility decreases and fracture becomes increasingly intergranular with increasing S concentration. Oxides and nitrides nucleate cavities only in the presence of segregated S; by themselves they are relatively benign. The harmful effects of S can be ameliorated by the addition of carbon and phosphorus. It is unclear whether C and P have beneficial effects of their own, or whether they act merely by counteracting the negative effects of sulfur. Carbides almost never nucleate cavities. In Ni‐base alloys, too, S is deleterious, and alloying with strong sulfide getters increases ductility and rupture life. Boron and P interact synergistically and increase stress rupture lives in some alloys but not in others. The detailed mechanism of this interaction is not well understood.

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Trace element effects on ductility and fracture of Ni-Cr-Ce alloys

Cited by 11 publications

References 11 publications

Oxidation behavior of FeAl+Hf, Zr, B

Oxidation behavior of FeAl+Hf, Zr, B

Effect of rare earth metals on solidification behaviour in nickel based superalloy

Review of Trace Element Effects on High-Temperature Fracture of Fe- and Ni-Base Alloys

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