Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 26    No. 2    February 2016

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Effect of gap size on microstructure of transient liquid phase bonded IN-738LC superalloy
Vahid MALEKI1, Hamid OMIDVAR1, Mohammad-reza RAHIMIPOUR2

1. Department of Mining and Metallurgical Engineering,
Amirkabir University of Technology (Tehran Polytechnic), Tehran 15875-4413, Iran;
2. Department of Ceramic, Materials and Energy Research Center, Karaj 31787-316, Iran

Abstract:In order to investigate the microstructure evolution and gain complete isothermal solidification time, transient liquid phase (TLP) bonding of IN-738LC superalloy was carried out using powdered AMS 4777 as the filler metal. The influence of gap size and bonding time on the joints was investigated. For example, complete isothermal solidification time for 40 μm gap size was obtained as 45 min. In the case of lack of completion of isothermal solidification step, the remained molten interlayer cooled in the bonding zone under non-equilibrium condition and γ–γ′ eutectic phase formed in that area. The relationship between gap size and holding time was not linear. With the increase in gap size, eutectic phase width became thicker. In the diffusion affected zone, a much larger amount of alloying elements were observed reaching a peak. These peaks might be due to the formation of boride or silicide intermetallic. With the increase in gap size, the time required for bonding will increase, so the alloying elements have more time for diffusion and distribution in farther areas. As a result, concentrations of alloying elements decreased slightly with the increase in the gap size. The present bi-phasic model did not properly predict the complete isothermal solidification time for IN-738LC-AMS 4777-IN-738LC TLP bonding system.

 

Key words: IN-738LC superalloy; transient liquid phase (TLP) bonding; gap size; complete isothermal solidification

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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