Microstructural changes in padding welds made from the 713C alloy after heat treatment

• Autorzy: Lachowicz M. B.
• Języki publikacji: EN

Abstrakty

EN

The following paper presents the results of the metallographic research of the padding welds made from cast alloy Inconel 713C that had undergone heat treatment in four different time and temperature variants. Annealing was applied at temperatures 1150^oC and 950^oC. The results of the research showed a strong coalescence of precipitation of the intermetalic γ’ phase (Ni3Al), resulting in formation of subgrains. The coalescence of the γ’ particles ran simultaneously with a diffusive decomposition of carbides (NbTi)C, which caused the supersaturation of the γ’ phase with niobium, and the loss of its coherence with austenite γ. The phenomenon of the formation of subgrains intensified with the lengthening of the time of annealing. The analysis of the results showed that heating the alloy that had undergone pad welding to the temperatures used in the research is detrimental to the alloy because of the loss of the strengthening of the coherent γ’ phase and the increase of the brittleness.

Słowa kluczowe

EN

heat treatment; metallography; superalloy 713C; Ni3Al; NbC

PL

obróbka cieplna; metalografia; nadstop 713C; Ni3Al; NbC

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2010
• Tom: Vol. 10, iss. 3 spec.
• Strony: 11--16
• Opis fizyczny: Bibliogr. 7 poz., il.

Twórcy

autor

Lachowicz M. B.

• Wroclaw University of Technology, Institute of Materials Science and Applied Mechanics, ul. Smoluchowskiego 25, 50-370 Wroclaw, Poland

Bibliografia

• [1] A. Somoza, G. Santos, A. Ges, R. Versaci, F. Plazaola, Agehardening and precipitation phenomena in the Inconel 713C superalloy studied by means of positron lifetime spectroscopy, Phys. Stat. Sol. 174, (1999) 189-198.
• [2] F. Zupanič, T. Bončina, A. Križman, F.D. Tichelaar, Structure of continuously cast Ni-based superalloy Inconel 713C, J Alloys Compo 329, (2001) 290-297.
• [3] M.B Henderson, D. Arrell, M. Heobel, R. Larsson, G. Marchant, Nickiel-Based Superalloy Welding Practices for Industrial Gas Turbine Applications, www.msm.cam.ac.uk/phasetrans/2002/papers/APNickelWeldv2.
• [4] B. Mikułowski; Heat-resisting and creep-resisting alloys – superalloys; AGH, Kraków, 1997 (in Polish).
• [5] M. Lachowicz, W. Dudziński, K. Haimann, M. Podrez-Radziszewska, Microstructure transformations and cracking in the matrix of γ-γ’ superalloy Inconel 713C melted with electron beam, Mat Sci Eng A 479 (2008) 269-276.
• [6] M. Lachowicz, W. Dudziński, M. Podrez-Radziszewska, TEM observation of the heat-affected zone in electron beam welded superalloy Inconel 713C, Mater Charact 59 (2008) 560-566.
• [7] M. Lachowicz, W. Dudziński, Non-equilibrium decomposition of MC carbides in superalloy Inconel 713C melted with welding techniques, Archiv Metall Mater, vol.55, No 1 (2010) (in the press).