Effect of high temperature aging on lattice parameter,lattice strain,γ/γ΄ misfit,microstructure and mechanical properties of Alloy 617

Abstract

In the present study, the lattice misfit and lattice strain of γ and γ΄ phases in Alloy 617 aged at 700 °C have been studied using XRD and correlated with FESEM and TEM microstructure. Aged Alloy 617 showed the presence of fine uniformly distributed γ´-Ni₃(Al, Ti) precipitates within the grains (γ-matrix) along with carbides predominantly along the grain boundaries. Lattice misfit of γ/γ΄ calculated in aged specimens revealed that misfit is negative for 100 h and 1000 h aged samples and it changes to positive for 4000 h of aging time. The lattice strain was evaluated by Stephen's phenomenological method and it is anisotropic in nature. The reduction in the lattice parameter of the alloy with aging explains the stress relaxation cracking in Alloy 617.

Keywords

Alloy 617 XRD anisotropy Misfit strain

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References

Reed

. The superalloys: fundamentals and applications. Cambridge: Cambridge University Press, 2008.

Reed

Rae

. Physical metallurgy of the nickel-based superalloys. In: Physical metallurgy. Elsevier, 2014, pp. 2215–2290.

Liu

Zhang

. Nickel-Based superalloys. Ref Module Mater Sci Mater Engg 2020: 1–11. DOI: 10.1016/B978-0-12-803581-8.12093-4

Long

Wei

Liu

, et al. Effect of lattice misfit on the evolution of the dislocation structure in Ni-based single crystal superalloys during thermal exposure. Acta Materialia 2016; 120: 95–107.

Cozar

Pineau

. Morphology of y’and y” precipitates and thermal stability of inconel 718 type alloys. Metall Trans 1973; 4: 47–59.

Whitmore

Ahmadi

Stockinger

, et al. Microstructural investigation of thermally aged nickel-based superalloy 718Plus. Mater Sci Eng A 2014; 594: 253–259.

Pyczak

Devrient

Mughrabi

. The effects of different alloying elements on the thermal expansion coefficients, lattice constants and misfit of nickel-based superalloys investigated by X-ray diffraction. Superalloys 2004; 2004: 827–836.

Royer

Bastie

. Misfit and lattice parameters of single crystal am1 superalloy: effects of temperature, precipitate morphology and y-y’ interfacial stresses. Superalloys 1996; 1996: 221–228.

Wilson

Fuchs

. The effect of composition, misfit, and heat treatment on the primary creep behavior of single crystal nickel base superalloys PWA 1480 and PWA 1484. Superalloys-2008. TMS 2008: 149–158. DOI: 10.7449/2008/Superalloys_2008_149_158

10.

Goodfellow

. Strengthening mechanisms in polycrystalline nickel-based superalloys. Mater Sci Technol 2018; 34: 1793–1808.

11.

Ricks

Porter

Ecob

. The growth of γ′ precipitates in nickel-base superalloys. Acta Metall 1983; 31: 43–53.

12.

Mishima

Ochiai

Suzuki

. Lattice parameters of Ni (γ), Ni3Al (γ’) and Ni3Ga (γ’) solid solutions with additions of transition and B-subgroup elements. Acta Metall 1985; 33: 1161–1169.

13.

Ren

Swimdeman

. A review paper on aging effects in Alloy 617 for Gen IV Nuclear Reactor applications.

14.

Siefert

Shingledecker

DuPont

, et al. Weldability and weld performance of candidate nickel based superalloys for advanced ultrasupercritical fossil power plants part II: weldability and cross-weld creep performance. Sci Technol Weld Join 2016; 21: 397–427.

15.

Schmidt

Foß

Hölzel

, et al. “Component test facility for a 700˚C power plant (Comtes700)”, Final report of the European Union Directorate-General for Research and Innovation, European Commission, 2013, DOI 10.2777/98172.

16.

Wojdyr

. Fityk: a general-purpose peak fitting program. J Appl Crystallogra 2010; 43: 1126–1128.

17.

Rodríguez

. An Introduction to the programme FullProf 2000. Laboratoire Léon Brillouin (CEA-CNRS), 2001 July. France.

18.

Ungár

Borbély

. The effect of dislocation contrast on x-ray line broadening: a new approach to line profile analysis. Appl Phy Lett 1996; 69: 3173–3175.

19.

Leineweber

Mittemeijer

. Diffraction line broadening due to lattice-parameter variations caused by a spatially varying scalar variable: its orientation dependence caused by locally varying nitrogen content in∊-FeN0. 433. J Appl Crystallogr 2004; 37: 123–135.

20.

Rietveld

. A profile refinement method for nuclear and magnetic structures. J Appl Crystallogr 1969; 2: 65–71.

21.

Dreele

LAC

Von

. General Structure Analysis System. LANSCE. 1994;MS-H805.

22.

Toby

. EXPUGI, A graphical user interface for GSAS. Appl Crystallogr 2001; 34: 210–213. DOI: 10.1107/S0021889801002242

23.

Stephens

. Phenomenological model of anisotropic peak broadening in powder diffraction. J Appl Crystallogr 1999; 32: 281–289.

24.

Mughrabi

. The importance of sign and magnitude of γ/γ′ lattice misfit in superalloys—with special reference to the new γ′-hardened cobalt-base superalloys. Acta Mater 2014; 81: 21–29.

25.

Pollock

Field

. Dislocations and high-temperature plastic deformation of superalloy single crystals. In: Dislocations in solids. Vol. 11. Elsevier, 2002, pp. 547–618.

26.

Williamson

Hall

. X-ray line broadening from filed aluminium and wolfram. Acta Metall 1953; 1: 22–31.

27.

Sabeena

George

Murugesan

, et al. Microstructural characterization of transformation products of bcc 尾 in ti-15 Mo alloy. Journal of Alloy Compd 2016; 658: 301–315.

28.

Murugesan

Thirumurugesan

Parameswaran

. Understanding microstrain anisotropy in yttrium oxide synthesized by sol-gel route. In: AIP Conference Proceedings 2018 Apr 10 (Vol. 1942, No. 1), 2018, 050063 AIP Publishing.

29.

Pourghahramani

Forssberg

. Comparative study of microstructural characteristics and stored energy of mechanically activated hematite in different grinding environments. Int J Miner Process 2006; 79: 120–139.

30.

Wang

Muránsky

Zhu

, et al. On the kinetics of gamma prime (γ’) precipitation and its strengthening mechanism in Alloy 617 during a long-term thermal aging. Materialia 2020; 11: 100682.

31.

Unikela

Dey

Albert

. Microstructure and mechanical properties characterization of aged and repair welded Alloy 617M. Weld World 2023; 67: 1155–1168.

32.

Goodfellow

Galindo-Nava

Christofidou

, et al. Gamma prime precipitate evolution during aging of a model nickel-based superalloy. Metall Mater Trans A 2018; 49: 718–728.

33.

Ren

. Development of a controlled material specification for Alloy 617 for nuclear applications. Oak Ridge, TN (United States): Oak Ridge National Lab. (ORNL), 2005 May 1.

34.

Saito

Komai

Hashimoto

. Evaluation of stress relaxation cracking susceptibility in Alloy 617 for advanced USC boilers. Int J Press Vessel Pip 2018; 168: 183–190.

35.

Heilmaier

Leetz

Reppich

. Order strengthening in the cast nickel-based superalloy IN 100 at room temperature. Mater Sci Eng A 2001; 319: 375–378.

36.

Kelly

Nicholson

. Strengthening methods in crystals. (No Title). 1971 Jan.

37.

Yoo

Choi

, et al. Influence of thermo-mechanical treatment on the precipitation strengthening behavior of inconel 740, a Ni-based superalloy. J Mater Res 2011; 26: 1253–1259.

38.

Hüther

Reppich

. Interaction of dislocations with coherent, stress-free, ordered particles. Int J Mater Res 1978; 69: 628–634.

39.

INCONEL® alloy 617, Special Metals.

40.

Rodriguez

. Sixty years of dislocations. Bull Mater Sci 1996; 19: 857–872.

41.

Mughrabi

. Materials science and technology, volume 6, plastic deformation and fracture of materials. Mater Sci Technol 1996; 6: 710.

42.

Nazmy

Gerdes

. The relaxation behavior of high chromium-Ni base superalloys. Adv Mater Res 2011; 278: 321–326.