The long isothermal solidification and homogenization time is the major concern in repairing turbine parts by the conventional transient liquid phase method. In this study, microstructure and morphology of the proposed two-step heating transient liquid phase joints were compared to results of the conventional ones conducted at the same temperature. After the isothermal solidification, deleterious precipitates such as Ni3Si, Ni3B and CrB were removed. The application of the two-step technique increased the shear strength of the joints up to 28% (516–674 MPa) due to collision of two non-planar interfaces and formation of the longer bonding line. The shear fracture surfaces of all bonds with the complete isothermal solidification stage represent a dimple pattern that is characterized by ductile fracture. The stress-rupture life of the joint at 982 °C was about 85% of the superalloy service life at this temperature.
RushMT. Development of weld repair methods for Rene 80 nickel based superalloy. PhD Thesis, Cranfield University, UK, 2012.
2.
YeYZouGLongW, et al.TLP Repaired IN738LC superalloy with uneven surface defect gap width after post heat treatment: microstructure and mechanical properties. J Alloy Compd2018; 748: 26–35.
3.
ShojaatiMBeidokhtiB. Characterization of AISI 304/AISI 409 stainless steel joints using different filler materials. Constr Build Mater2017; 147: 608–615.
4.
WikstromNEgbewandeAOjoO. High temperature diffusion induced liquid phase joining of a heat resistant alloy. J Alloy Compd2008; 460: 379–385.
5.
SahaRKhanT. Microstructural developments in TLP bonds using thin interlayers based on Ni–B coatings. Mater Charact2009; 60: 1001–1007.
6.
HadibeykSBeidokhtiBSajjadiSA. The effect of interlayer thickness, bonding temperature and atmosphere on transient liquid phase bonding of GTD-111 to FSX-414. J Mater Process Technol2018; 255: 673–678.
7.
RamakrishnanADindaGP. Direct laser metal deposition of Inconel 738. Mater Sci Eng A2019; 740–741: 1–13.
8.
AbbasiMBagheriBSharifiF, et al.Friction stir vibration brazing (FSVB): an improved version of friction stir brazing. Weld World2021; 65: 2207–2220. DOI: 10.1007/s40194–021-01173-5.
9.
AbbasiMBagheiM. New attempt to improve friction stir brazing. Mater Lett2021; 304: 130688.
10.
HadibeykSBeidokhtiBSajjadiSA. Effect of bonding time and homogenization heat treatment on the microstructure and mechanical properties of the transient liquid phase bonded dissimilar GTD-111/FSX-414 TLP superalloys. J Alloy Compd2018; 731: 929–935.
11.
CookGOSorensenCD. Overview of transient liquid phase and partial transient liquid phase bonding. J Mater Sci2011; 46: 5305–5323.
12.
KhakianMNateghSMirdamadiS. Effect of bonding time on the microstructure and isothermal solidification completion during transient liquid phase bonding of dissimilar nickel-based superalloys IN738LC and Nimonic 75. J Alloy Compd2015; 653: 386–394.
13.
GhoneimAOjoO. Microstructure and mechanical response of transient liquid phase joint in Haynes 282 superalloy. Mater Charact2011; 62: 1–7.
14.
YuanLXiongJRenJ, et al.Microstructure and mechanical properties in TLP joint of FeCoNiTiAl alloy and IC10 superalloy using Mn-Ni-Cr filler. Mater Charact2021; 178: 111292.
15.
WuYChenJZhangL, et al.Effect of boron on the structural stability, mechanical properties, and electronic structures of γ′-Ni3Al in TLP joints of nickel-based single-crystal alloys. Mater Today Commun2022; 31: 103375.
16.
Wang XLYanQ. A novel bonding process: super-cooled transient liquid phase bonding. Acta Metall Sin2007; 43: 1096–1100.
17.
WangXLiXWangC. Effect of two-step heating process on joint microstructure and properties during transient liquid phase bonding of dissimilar materials. Mater Sci Eng A2013; 560: 711–716.
18.
ZhangHXueJYeY, et al.Boride evolutionary behavior and mechanism in the TLP repaired IN738 superalloy with crack-like defects. J Alloy Compd2022; 909: 164692.
19.
AmiriDKamyabi-GolASajjadiSA. Standard heat treatment effects on TLP bonded IN-738LC superalloy using BNi-9 filler: an approach to make an ideal joint. Trans Nonferrous Met Soc China2022; 32: 192–205.
20.
GhahferokhiAIKasiri-AsgaraniMAminiK, et al.Role of interlayer composition in microstructure and mechanical properties during TLP bonding of GTD-111/IN-718 superalloys. Trans Nonferrous Met Soc China2022; 32: 908–926.
21.
DoroudiAEbrahimzadeh PilehroodA, et al.Effect of the isothermal solidification completion on the mechanical properties of Inconel 625 transient liquid phase bond by changing bonding temperature. J Mater Res Technol2020; 9: 10355–10365.
22.
LinYJiangtaoXYajieD, et al.Microstructure and mechanical properties in the TLP joint of FeCoNiTiAl and Inconel 718 alloys using BNi2 filler. J Mater Sci Technol2021; 61: 176–185.
23.
TaheriMHalvaeeAKashani BozorgSF, et al.The effect of heat treatment on creep behavior of GTD-111 superalloy welded by pulsed Nd:YAG laser using small punch testEng Fail Anal2021; 122: 105255.
24.
RezaeiARezaeianAKermanpurA, et al.Microstructural and mechanical anisotropy of selective laser melted IN718 superalloy at room and high temperatures using small punch testMater Charact2020; 162: 110200.
25.
PouranvariMEkramiAKokabiA. Effect of bonding temperature on microstructure development during TLP bonding of a nickel base superalloy. J Alloy Compd2009; 469: 270–275.
26.
AmirkhaniABeidokhtiBShirvaniK, et al.Two-step heating transient liquid phase bonding of Inconel 738LC. J Mater Process Technol2019; 266: 1–9.
27.
AbdelfatahMOjoO. Formation of eutectic-type microconstituent during transient liquid phase bonding of nickel: influence of process parameters. Mater Sci Technol2009; 25: 61–67.
28.
Abbasi KhazaeiBAsghariGBakhtiraiR. TLP Bonding of dissimilar FSX-414/IN738 system with MBF80 interlayer: prediction of solid/liquid interface location. Trans Nonferrous Met Soc China2014; 24: 996–1003.
29.
LiuKLiWDingR, et al.Microstructural evolution of the TLP joints of RAFM steel during aging and creep. Metals (Basel)2022; 12: 1333.
30.
TheskaFBuerstmayrRLiuH, et al.Influence of grain boundary precipitation and segregation on cracking of cast and wrought superalloys containing B and Zr. Mater Charact2022; 187: 111881.
31.
ShakerinSOmidvarHMirsalehiSE. The effect of substrate's heat treatment on microstructural and mechanical evolution of transient liquid phase bonded IN-738 LC. Mater Design2016; 89: 611–619.
32.
WangYYangJHuangJ, et al.First-principles calculations on physical properties of Ni3Snx binary system intermetallic compounds and Ni/Ni3Sn interfaces in Nickel-Tin TLPS bonding layer. Intermetallics2018; 101: 27–38.
33.
SAE. AMS 5409:1995. Alloy Casting, Investment, Corrosion and Heat Resistant 61Ni-16Cr-8.5Co-1.8Mo-2.6W-0.8Cb-3.4Ti-1.8Ta-3.4Al-0.010B-0.06Zr (0.03-0.08C) Vacuum Melted, Vacuum Cast As Cast
34.
LiuJDJinTZhaoNR, et al.Effect of transient liquid phase (TLP) bonding on the ductility of a Ni-base single crystal superalloy in a stress rupture testMater Charact2008; 59: 68–73.
35.
KimDUNishimotoK. Creep rupture and fatigue properties of transient liquid phase bonded joints of Ni base single crystal superalloy. Mater Sci Technol2003; 19: 456–460.
36.
ZhangHWQinXZLiXW, et al.Effect of minor additions on the microstructures and stress rupture properties of a directionally solidified Ni-based superalloy. Mater Sci Eng A2018; 711: 303–312.
37.
LiuXFanJZhangP, et al.Temperature dependence of deformation behavior, microstructure evolution and fracture mechanism of Inconel 625 superalloy. J Alloy Compd2021; 869: 159342.
