Cracking of Pad-Welded Inconel 713C Precision Castings

• Autorzy: Adamiec J. , Łyczkowska K.

Identyfikatory

DOI

10.24425/122531

• Języki publikacji: EN

Abstrakty

EN

Inconel 713C is a nickel-based casting alloy characterised by improved heat and creep resistance [1]. It is used e.g. in aircraft engine components, mainly in the form of precision castings. Precision casting enables very good reproduction of complex shapes. However, due to major differences in casting wall thickness and the resultant differences in rigidity, defects can form in precision castings. The most common defects in precision castings are shrinkage porosities and microcracks. Inconel 713C is considered to be a difficult-to-weld or even non-weldable alloy. However, the need to repair precision castings requires attempts to develop technologies for their remelting and pad welding which could be used in industrial practice. This article presents the results of tests consisting in TIG pad welding of defects identified in precision castings intended for the aircraft industry. It was found that the main reason behind failed attempts at repairing precision castings by welding technologies was hot cracking in the fusion zone. Such cracks form as a result of the partial melting of intercrystalline regions along the fusion line. The deformations occurring during the crystallization of the melting-affected zone (fusion zone + partially melted zone + heat affected zone) or pad weld lead to the rupture of the intercrystalline liquid film. Hot cracks form within the so-called high-temperature brittleness range (HTBR) of the alloy. Another type of cracks that was identified were ductility dip cracks (DDC), whose formation is related to the partial melting of carbides.

Słowa kluczowe

EN

Inconel 713C; nickel alloy; cracking; cast repairing

PL

Inconel 713C; stop niklu; pękanie; naprawa odlewu

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2018
• Tom: Vol. 18, iss. 2
• Strony: 215--219
• Opis fizyczny: Bibliogr. 8 poz., rys., tab., wykr.

Twórcy

autor

Adamiec J.

• Silesian University of Technology, Krasińskiego 8, 40-019 Katowice, Poland

autor

Łyczkowska K.

• Silesian University of Technology, Krasińskiego 8, 40-019 Katowice, Poland

Bibliografia

• [1] Engineering Properties of Alloy 713C, Nickel Institute, www.nickelinstitute.org.
• [2] Nickel Alloy, Corrosion and Heat Resistant, Investment Castings, 73Ni - 13Cr - 4.5Mo - 2.3Cb - 0.75Ti - 6.0Al - 0.010B - 0.10Zr Vacuum Cast, As-Cast, ASM 5391H; 2014.
• [3] Cers, A.E., Blatherwick, A.A. (1960). Fatigue and stress-rapture properties of Inconel 713C, V-57C and titanium alloys 7Al-3Mo-Ti and MST 821 (8Al-2Cb-1Ta-Ti), WADD Technical Report 60-426.
• [4] Binczyk, F. & Śleziona, J. (2009). Phase transformations and microstructure of IN-713C nickel superalloy. Archives of Foundry Engineering. 9(2), 109-112.
• [5] Łyczkowska, K. & Adamiec, J. (2017). Repair of precision casting made of the Inconel 713C alloy. Archives of Foundry Engineering. 17(3), 210-216.
• [6] Lachowicz, M. (2010). Microstructural changes in padding welds made from the 713C alloy after heat treatment. Archives of Foundry Engineering. 10(3), 11-16.
• [7] Łyczkowska, K., Adamiec, J., Jachym, R. & Kwieciński, K. (2017). Properties of the Inconel 713 Alloy Within the High Temperature Brittleness Range. Archives of Foundry Engineering. 17(4), 103-108.
• [8] Tasak, E. (2008). Welding metallurgy. Wydawnictwo JAK ISBN: 9788392319115. (in Polish).

Uwagi

PL

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2018).