The influence of cobalt on the tensile and stress-rupture properties of the nickel-base superalloy mar-m247

Nathal, M. V.; Maier, Ralph; Ebert, L. J.

doi:10.1007/bf02647832

Cited by 56 publications

(20 citation statements)

References 13 publications

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“…In the other words, why did the DFW not fail at the "weaker" HAZ under these conditions? Comparing creep resistance of IN 718 with that of M247, the latter could be appreciably higher than the former at the present test temperature range [14,15]. In this work, cyclic loading is repeated under strain-controlled conditions for DFW specimens consisting of the two materials.…”

Section: Discussionmentioning

confidence: 88%

Creep-Fatigue and Thermo-Mechanical Fatigue of Friction-Welded IN 718/MarM247 Dissimilar Joint

Okazaki¹,

Sakaguchi²,

Tran³

et al. 2008

Superalloys 2008 (Eleventh International Symposium)

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The high temperature strength of the friction welded superalloy joint between cast polycrystalline Mar-M247 and the forged IN718 alloys has been investigated under low cycle and thermomechanical fatigue loadings, in comparison with those of the base materials. The experiments showed that the lives of the dissimilar joints were significantly influenced by the test conditions and loading modes. Not only the lives themselves but also the failure positions and mechanisms were sensitive to the loading mode. Especially under the loading conditions in which the creep-fatigue interaction was pronounced, some specific failure phenomena appeared in the DFW joint. The fracture behavior dependences on the loading modes and test conditions were discussed, based on analyses of the macroscopic elastic follow-up mechanism, the stress state by finite element method, and the inhomogeneous microstructure in the joint.

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Section: Discussionmentioning

confidence: 88%

Creep-Fatigue and Thermo-Mechanical Fatigue of Friction-Welded IN 718/MarM247 Dissimilar Joint

Okazaki¹,

Sakaguchi²,

Tran³

et al. 2008

Superalloys 2008 (Eleventh International Symposium)

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“…Comparison of the PGM alloys studied here to commercial superalloys shows that the PGM alloys do not possess the same degree of creep resistance. Polycrystalline superalloy MAR-172 MPa [44], while the alloys investigated here can tolerate approximately 80 MPa under the same creep conditions. However, many aspects of the present alloys have not been optimized, including solid solution strengthening of both phases, aging heat treatments and additions of grain boundary strengthening elements such as C and B.…”

Section: Discu Tate Morphologymentioning

confidence: 92%

Gamma Prime Morphology and Creep Properties of Nickel Base Superalloys with Platinum Group Metal Additions

Sluytman¹,

Suzuki²,

Bolcavage³

et al. 2008

Superalloys 2008 (Eleventh International Symposium)

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The microstructure and creep properties of platinum group metal (PGM) modified nickel based superalloys have been investigated. Alloys containing Pt and/or Ir along with variations in Cr, Ta, Re, Ru, and W exhibited relatively high solidus and liquidus temperatures. Differential thermal analysis (DTA) showed a strong dependence of the γ´ solvus on the level of Ta. The morphology of the γ´ precipitates was influenced by the presence of Cr, Ta, Ru, and W and ranged from cuboidal to semi-spherical. Compression creep tests were conducted at 1000°C at stresses ranging from 40-90 MPa. Alloys containing approximately 8 wt% Pt combined with Cr and Ta displayed the best resistance to creep deformation at stresses around 80 MPa. Post-creep analysis of the rafted structures indicated that all PGM modified alloys without Ru and W possessed positive misfit with magnitudes ranging from ≈ 0.3 to 1.5%. The partitioning of PGMs between the γ and γ´ phases and their resultant influence on creep performance is discussed.

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“…However, this requires the application of more durable and also costlier materials. In this regard, nickel-based superalloys have evolved into complex alloy systems with exceptional high-temperature strength, creep resistance, and fatigue behaviour [2][3][4][5][6][7][8][9]. Second-generation polycrystalline cast superalloy MAR-M247 becomes a perspective material that satisfactorily covers the needs of small power facilities and aircraft engines, and in the near future, it may fully replace material IN713 LC used so far.…”

Section: Introductionmentioning

confidence: 99%

High-temperature low-cycle fatigue behaviour of HIP treated and untreated superalloy MAR-M247

Šulák¹,

Obrtlík²,

Čelko³

2016

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The effect of hot isostatic pressing (HIP) treatment on high-temperature low cycle fatigue (LCF) behaviour of γ precipitation strengthened nickel-based superalloy MAR-M247 was studied. Microstructural observations revealed coarse-grained dendritic structure with an average grain size of 2.1 mm. Distribution and size of casting defects were assessed on cross sections of both HIP treated and untreated MAR-M247. Shape and size of precipitates were documented. Vickers hardness tests did not reveal differences between both materials. Untreated specimens were cyclically strained under total strain control at 900• C. Likewise, tests were performed on the HIP treated material at temperatures of 900 and 950• C. The stress--strain response was recorded. Coffin-Manson and Basquin fatigue life curves were established. HIP treatment leads to an increase of lifetime in comparison with the untreated material. Precipitate depleted zone was observed and crack initiation sites were identified. Dislocation arrangements were studied in TEM. Planar bands containing antiphase boundaries were observed.K e y w o r d s : hot isostatic pressing, Ni-based superalloy, high-temperature low cycle fatigue, fatigue life curves, dislocation structures, planar bands

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The influence of cobalt on the tensile and stress-rupture properties of the nickel-base superalloy mar-m247

Cited by 56 publications

References 13 publications

Creep-Fatigue and Thermo-Mechanical Fatigue of Friction-Welded IN 718/MarM247 Dissimilar Joint

Creep-Fatigue and Thermo-Mechanical Fatigue of Friction-Welded IN 718/MarM247 Dissimilar Joint

Gamma Prime Morphology and Creep Properties of Nickel Base Superalloys with Platinum Group Metal Additions

High-temperature low-cycle fatigue behaviour of HIP treated and untreated superalloy MAR-M247

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