The influence of boron on the grain boundary chemistry and microstructure of ni- 16cr- 9fe- 0.03c

Kruger, R. M.; Was, G. S.

doi:10.1007/bf02645483

Cited by 22 publications

(3 citation statements)

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“…However, the compositions of bright and dark precipitates obtained using similar experimental conditions are not significantly different (see table 3) and close to this expected for Ni23B6. This is the only type of nickel-rich precipitate observed in the material in our TEWEDX investigations of extraction replicas and also according to the investigation by Kruger and Was of a similar material [4]. The observed boron concentration is also close to this of Ni3B, which is a stable phase in the binary nickel-boron system [18].…”

Section: Field Evaporation Of Ni23b6supporting

confidence: 77%

“…It has previously been shown by TEM that Ni23B6 is one of two main types of intergranular precipitates, the other is Cr7C3, in materials similar to Alloy B in this investigation [4]. When analysing Ni23B6 by atom probe-at a specimen temperature of 80 K using a pulse fraction of 20%, a standard condition that gave reliable results for matrix analysis, the obtained boron concentration was higher than expected.…”

Section: Field Evaporation Of Ni23b6mentioning

confidence: 44%

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On APFIM of Grain Boundaries in a Nickel Base Superalloy

Thuvander

Stiller

1996

J. Phys. IV France

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Abstract. Experimental details of atom probe field ion microscopy (APFIM) of a Ni-16Cr-9Fe alloy are presented. In particular, studies concerning analysis of intergranular carbides and borides and segregation to grain boundaries are described. It was found that NiZ3B6 precipitates are very sensitive to preferential field evaporation, which necessitates optimization of the analysis conditions. In the FIM images, nickel-and boron-rich precipitates exhibited either dark or bright contrast with respect to the austenitic matrix. Analysis of a grain boundary that contained a high level of segregated carbon, revealed that carbon is partially field evaporated as complex ions. In this analysis, chromium and carbon often appeared next to each other in the ion chain. Together, these two observations indicate nucleation of chromium carbides, which are known to form after extended heat treatment at the applied temperature (600°C).

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Section: Field Evaporation Of Ni23b6supporting

confidence: 77%

Section: Field Evaporation Of Ni23b6mentioning

confidence: 44%

On APFIM of Grain Boundaries in a Nickel Base Superalloy

Thuvander

Stiller

1996

J. Phys. IV France

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“…No all-inclusive statement can be made concerning the most desirable type and morphology of carbides [10,11]. In general optimum high temperature properties are obtained when M 23 C 6 is present as discrete particles distributed uniformly along the GBs [12][13][14]. However, much less effort has been devoted to the detailed study of precipitation and evolution mechanism of intergranular M 23 C 6 during high temperature creep.…”

Section: Introductionmentioning

confidence: 99%

Evolution of Grain Boundary Precipitates in a Directionally Solidified Ni‐Base Superalloy during High Temperature Creep

et al. 2012

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The evolution of grain boundary phases during high temperature creep has been systematically investigated in a directionally solidified Ni-base superalloy. At the primary creep stage, precipitation of nanosize M 5 BB 3 boride from γ matrix and phase transformation from M 23 (C,B) 6 borocarbide to M 5 B 3 B boride occur at grain boundaries. At the steady-state creep stage, precipitation of blocky M 23 (C,B) 6 borocarbide and coarsening of M 23 (C,B) 6 with the dissolution of M 5 BB 3 boride occur at grain boundaries. At the tertiary creep stage, precipitation of M 5 B 3 B boride from γ matrix or phase transformation from M 23 (C,B) 6 borocarbide to M 5 BB 3 boride occur again at grain boundaries. The precipitation of M 5 B 3 B is due to diffusion of B atoms promoted by applied tensile stress during high temperature creep, and the phase transformation between M 23 (C,B) 6 and M 5 BB 3 is thought to correlate strongly with the strain rate of different creep stages.

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