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New insights into microstructural changes during transient liquid phase bonding of GTD-111 superalloy

Transactions of Nonferrous Metals Society of China 2021年第9期31卷 2703-2715页

作者： Javad ASADI Seyed Abdolkarim SAJJADI Hamid OMIDVAR Materials and Metallurgical Engineering Department Faculty of EngineeringFerdowsi University of MashhadMashhadIran Department of Materials and Metallurgical Engineering Amirkabir University of Technology(Tehran Polytechnic)TehranIran

The effects of joining temperature(TJ)and time(tJ)on microstructure of the transient liquid phase(tlp)bonding of GTD-111 superalloy were *** bonding process was applied using BNi-3 filler at temperatures of 1080,1120,and 1160℃ for isothermal solidification time of 195,135,and 90 min,*** heat treatment was also applied to all of the *** results show that intermetallic and eutectic compounds such as Ni-rich borides,Ni−B−Si ternary compound and eutectic-γcontinuously are formed in the joint region during *** increasing tJ,intermetallic phases are firstly reduced and eventually eliminated and isothermal solidification is completed as *** the increase of the holding time at all of the three bonding temperatures,the thickness of the athermally solidified zone(ASZ)and the volume fraction of precipitates in the bonding area decrease and the width of the diffusion affected zone(DAZ)*** results are also obtained by increasing TJ from 1080 to 1160℃ at tJ=90 ***,increasing the TJ from 1080 to 1160℃ leads to the faster elimination of intermetallic phases from the ***,these phases are again observed in the joint region at 1180℃.It is observed that by increasing the bonding temperature,the bonding width and the rate of dissolution of the base metal *** on these results,increasing the homogenization time from 180 to 300 min leads to the elimination of boride precipitates in the DAZ and a high uniformity of the concentration of alloying elements in the joint region and the base metal.

关键词： tlp bonding joint GTD-111 superalloy isothermal solidification microstructure homogenization

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