Microstructures and mechanical properties of Ti3Al/Ni-based superalloy joints arc welded with Ti–Nb and Ti–Ni–Nb filler alloys

Chen, Bingqing; Xiong, Hanguo; Sun, Bin; Tang, Siyi; Du, Borui; Li, Neng

doi:10.1016/j.pnsc.2014.06.003

Cited by 29 publications

(5 citation statements)

References 23 publications

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“…Titanium, which is a -former element too, as Al and Nb, may be a base element as in the well-known TA6V alloy [17]. It is involved in different types of aluminides for high temperatures [18]. Zirconium, which can be present in the chemical compositions of superalloys based on cobalt [19] or on nickel [20], is also the main element of the famous Zircaloy-4 [21].…”

Section: Discussionmentioning

confidence: 99%

Looking for New Polycrystalline MC-Reinforced Cobalt-Based Superalloys Candidate to Applications at 1200°C

Berthod

2017

Advances in Materials Science and Engineering

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For applications for which temperatures higher than 1150°C can be encountered the currently best superalloys, the γ/γ′ single crystals, cannot be used under stress because of the disappearance of their reinforcing γ′ precipitates at such temperatures which are higher than their solvus. Cobalt-based alloys strengthened by refractory and highly stable carbides may represent an alternative solution. In this work the interest was focused on MC carbides of several types. Alloys were elaborated with atomically equivalent quantities in M element (among Ti, Ta, Nb, Hf, or Zr) and in C. Script-like eutectic TiC, TaC, NbC, HfC, and ZrC carbides were successfully obtained in the interdendritic spaces. Unfortunately, only one type, HfC, demonstrated high morphological stability during about 50 hours at 1200°C. The concerned alloy, of the Co-25Cr-0.5C-7.4Hf type (in wt.%), was further characterized in flexural creep resistance and air-oxidation resistance at the same temperature. The creep behaviour was very good, notably by comparison with a more classical Co-25Cr-0.5C-7.5Ta alloy, proving that the interest of HfC is higher than the TaC one. In contrast the oxidation by air was faster and its behaviour not really chromia-forming. Significant improvements of this chemical resistance are expected before taking benefit from the mechanical superiority of this alloy.

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Section: Discussionmentioning

confidence: 99%

Looking for New Polycrystalline MC-Reinforced Cobalt-Based Superalloys Candidate to Applications at 1200°C

Berthod

2017

Advances in Materials Science and Engineering

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“…A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT 22 Ti-Ni-Nb phase, (Nb, Ti) solid solution, Ti 2 Ni and TiNi intermetallics, as well as eutectic microstructure composed of B2-TiNi and bcc-(Nb, Ti).…”

Section: Discussionmentioning

confidence: 99%

“…5(e), the quantity of the eutectic phases is evidently increased compared withFig. 5(d), and this should be due to the composition change from TiNi 36-45 Nb[14][15][16][17][18][19][20][21][22] to TiNi 46-56 Nb 7-13 .…”

mentioning

confidence: 92%

Dissimilar joining of Ti3Al-based alloy to Ni-based superalloy by arc welding technology using gradient filler alloys

et al. 2015

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“…Titanium is on the one hand the base of various alloys for biomedical [4] or structural aeronautical parts [5]. On the other hand one it also features among the key alloying elements, by playing a particularly important role in numerous superalloys [6][7][8] and Ti 3 Al or TiAl aluminides [9][10][11]. Titanium may notably be present in the γ' intermetallic compound [12][13][14] or ɳ phase [15] with often high benefit for the mechanical properties of the alloys at high temperature [16].…”

Section: Introductionmentioning

confidence: 99%

Oxidation and creep properties at 1200 °C of cast quaternary Ni-Cr-C-Ti alloys

Berthod

Kretz

Allègre

et al. 2017

Materials Science and Engineering: A

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Three nickel-based alloys rich in chromium (25wt.%) and containing carbon and titanium in quantities chosen to promote the appearance of titanium carbides (0.25C-1Ti, 0.50C-1Ti and 0.50C-2Ti, in wt.%) were elaborated by casting in inert atmosphere. Their microstructures and their thermodynamic, chemical and mechanical behaviours at high temperature were studied. The as-cast microstructures of the obtained alloys are composed of a dendritic nickel matrix and of interdendritic carbides. These carbides are not TiC as expected, but Cr 7 C 3 , the whole titanium remaining in solid solution in the matrix. The applied {46h, 1200°C}exposure in air led to the development of an external duplex oxide scale constituted of a thick inner chromia scale and a thin outer rutile scale. These oxide layers resisted spallation more than the ones of Ti-free ternary reference alloys in similar conditions. The bulk's chromium carbides became rounder and coarsened, with as result a decrease in room temperature hardness. The {5 or 20 MPa, 1200°C}-3 points flexural creep tests showed a rather good behaviour, regarding the high test temperature. It is concluded that titanium seems hardening these bases of alloys at low and high temperatures. However the effects on the oxidation behaviour may be deleterious for the oxidation rate and subsurface Cr-impoverishment. In contrast Ti appears as beneficial for the resistances against spallation and possibly chromia volatilization. This needs to be further investigated.

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Microstructures and mechanical properties of Ti3Al/Ni-based superalloy joints arc welded with Ti–Nb and Ti–Ni–Nb filler alloys

Cited by 29 publications

References 23 publications

Looking for New Polycrystalline MC-Reinforced Cobalt-Based Superalloys Candidate to Applications at 1200°C

Looking for New Polycrystalline MC-Reinforced Cobalt-Based Superalloys Candidate to Applications at 1200°C

Dissimilar joining of Ti3Al-based alloy to Ni-based superalloy by arc welding technology using gradient filler alloys

Oxidation and creep properties at 1200 °C of cast quaternary Ni-Cr-C-Ti alloys

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