Effect of thermal exposure on microstructure and nano-hardness of broached Inconel 718

Chen, Zhe (author): Linköpings universitet,Konstruktionsmaterial,Tekniska högskolan

Peng, Ru (author): Linköpings universitet,Konstruktionsmaterial,Tekniska högskolan

Avdovic, Pajazit (author): Siemens Industrial Turbomachinery AB, Finspång, Sweden

Zhou, Jinming (author): Lund University,Lunds universitet,Industriell Produktion,Institutionen för maskinvetenskaper,Institutioner vid LTH,Lunds Tekniska Högskola,Production and Materials Engineering,Department of Mechanical Engineering Sciences,Departments at LTH,Faculty of Engineering, LTH,Division of Production and Materials Engineering, Lund university, Sweden

Moverare, Johan (author): Siemens Industrial Turbomachinery AB, Finspång, Sweden

Karlsson, Fredrik (author): Siemens Industrial Turbomachinery AB, Finspång, Sweden

Johansson, Sten (author): Linköpings universitet,Konstruktionsmaterial,Tekniska högskolan

(creator_code:org_t)

2014-08-29
2014
English.
In: MATEC Web of Conferences Vol. 14 (2014) EUROSUPERALLOYS 2014 – 2<sup>nd</sup> European Symposium on Superalloys and their Applications. - Les Ulis, France : E D P Sciences. ; 14, s. 08002-08002

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Abstract Subject headings

Inconel 718 is a high strength, heat resistant superalloy that is used extensively for components in hot sections of gas turbine engines. This paper presents an experimental study on the thermal stability of broached Inconel 718 in terms of microstructure and nano-hardness. The broaching process used in this study is similar to that used in gas turbine industries for machining fir-tree root fixings on turbine discs. Severe plastic deformation was found under the broached surface. The plastic deformation induces a work-hardened layer in the subsurface region with a thickness of ∼50 μm. Thermal exposure was conducted at two temperatures, 550 ∘C and 650 ∘C respectively, for 300 h. Recrystallization occurs in the surface layer during thermal exposure at 550 ∘C and α-Cr precipitates as a consequence of the growth of recrystallized δ phases. More recrystallized grains with a larger size form in the surface layer and the α-Cr not only precipitates in the surface layer, but also in the sub-surface region when the thermal exposure temperature goes up to 650 ∘C. The thermal exposure leads to an increase in nano-hardness both in the work-hardened layer and in the bulk material due to the coarsening of the main strengthening phase γ′′.

By the author/editor: Chen, Zhe; Peng, Ru; Avdovic, Pajazit; Zhou, Jinming; Moverare, Johan; Karlsson, Fredri ...; show more...; Johansson, Sten; show less...

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