Effect of bonding time on microstructure and completion of isotherm solidification during TLP bonding of dissimilar nickel base superalloys IN738LC and Nimonic 75

Khakian Ghomi, Meysam; Shahriari, Mohammad Saeid; Nategh, Saeid

doi:10.30495/apme.2021.510140.1047

Manuscript ID : APME-1505-1047 (R1) Visit : 329 Page: 13 - 25

10.30495/apme.2021.510140.1047

20.1001.1.24233226.1400.15.2.2.4

Article Type: Original Research

Effect of bonding time on microstructure and completion of isotherm solidification during TLP bonding of dissimilar nickel base superalloys IN738LC and Nimonic 75

Subject Areas :

Meysam Khakian Ghomi ¹ , Mohammad Saeid Shahriari ² , Saeid Nategh ³

1 - Ph.D. Materials science and engineering, Manager of repair of airospace department of Mavadkaran Engineering Co., Mapna, Karaj, Iran.
2 - M.S. Materials science and engineering, Manager of repair and refurbishment department of Mavadkaran Engineering Co., Mapna, Karaj, Iran.
3 - Ph.D. Department of Materials Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran.

Received: 2019-05-23 Accepted : 2019-08-06 Published : 2021-06-22

Keywords: Microstructure, Inconel 738 and Nimonic 75 Nickel Base Superalloys, Transient Liquid Phase Bonding, Isotherm Solidification,

Abstract :

Joining of Inconel 738 and Nimonic 75 nickel base superalloys using Ni-Cr-B-containing interlayer, MBF-80, performed by transient liquid phase process (TLP) at 1080, 1120, 1150 and 1180°C and different times. Bonding microstructure was studied using a scanning electron microscope (SEM) and a light microscope. Microstructural studies showed that in short bonding time, the microstructure consists of continuous eutectic intermetallic phases in the center line of the joint and with increasing bonding time at constant temperature, eutectic intermetallic phases gradually decrease from the bonding and finally completely disappear. In order to predict the time required to isotherm solidification completion, Fick’s diffusion equations were used and it was observed that there is a good agreement between the predicted time of isotherm solidification completion and experimental results.

References:

[1] O. A. Ojo, "On liquation cracking of cast inconel 738LC superalloy welds", PhD Dissertation, University of Manitoba, Canada, 2005.

[2] "Nimonic 75 alloy, Special Metals Corporation". 2014.

[3] M. Pouranvari, A. Ekrami & A. Kokabi, "Microstructure development during transient liquid phase bonding of GTD-111 nickel-based superalloy", Journal of alloys and compounds. vol. 461, pp. 641-647, 2008.

[4] M. Haafkens & J. Matthey, "A new approach to the weldability of nickel-base As-cast and power metallurgy superalloys", Weld. Journal, vol. 61, pp. 25-30, 1982.

[5] M. Abdelfatah & O. Ojo, "On the extension of processing time with increase in temperature during transient-liquid phase bonding", Metallurgical and Materials Transactions A. vol. 40, pp. 377-385, 2009.

[6] J. Mattheij, "Role of brazing in repair of superalloy components–advantages and limitations", Materials science and technology. vol. 1, pp. 608-612, 1985.

[7] M. Mosallaee, A. Ekrami, K. Ohsasa & K. Matsuura, "Microstructural evolution in the transient-liquid-phase bonding area of IN-738LC/BNi-3/IN-738LC", Metallurgical and Materials Transactions A. vol. 39, pp. 2389-2402, 2008.

[8] F. Jalilian, M. Jahazi & R. Drew, "Microstructural evolution during transient liquid phase bonding of Inconel 617 using Ni–Si–B filler metal", Materials Science and Engineering: A. vol. 423, pp. 269-281, 2006.

[9] A. Rabinkin, "Brazing with (NiCoCr)–B–Si amorphous brazing filler metals: alloys, processing, joint structure, properties, applications", Science and Technology of Welding & Joining, vol. 9, pp. 181-199, 2004.

[10] D. Duvall, W. Owczarski & D. Paulonis, "TLP bonding: a new method for joining heat resistant alloys", Pratt and Whitney Aircraft, Middletown, CO. 1974.

[11] T. Shinmura, K. Ohsasa & T. Narita, "Isothermal Solidiﬁcation Behavior During the Transient Liquid Phase Bonding Process of Nickel Using Binary Filler Metals". vol. 42, pp. 292-297, 2001.

[12] W. MacDonald & T. Eagar, "Transient liquid phase bonding processes", The Metal Science of Joining, pp. 93-100. 1992.

[13] W. Gale and D. Butts, "Transient liquid phase bonding", Science and Technology of Welding & Joining, vol. 9, pp. 283-300, 2004.

[14] M. Pouranvari, A. Ekrami & A. Kokabi, "Solidification and solid state phenomena during TLP bonding of IN718 superalloy using Ni–Si–B ternary filler alloy", Journal of Alloys and Compounds, vol. 563, pp. 143-149, 2013.

[15] M. Pouranvari, A. Ekrami & A. Kokabi, "Phase transformations during diffusion brazing of IN718/Ni-Cr-B/IN718", Materials Science and Technology, vol. 29, pp. 980-984, 2013.

[16] W. Gale & E. Wallach, "Microstructural development in transient liquid-phase bonding", Metallurgical Transactions A, vol. 22, pp. 2451-2457, 1991.

[17] "Alloy Phase Diagrams", 10 ed. ASM Handbook. Vol. 3, ASM International, 1992.

[18] P. Sung & D. Poirier, "Liquid-solid partition ratios in nickel-base alloys", Metallurgical and Materials Transactions A, vol. 30, pp. 2173-2181, 1999.

[19] A. Bondar, "B-Cr-Ni (Boron-Chromium-Nickel)", Non-Ferrous Metal Ternary Systems. Selected Soldering and Brazing Systems: Phase Diagrams, Crystallographic and Thermodynamic Data.

[20] K. Ohsasa, T. Narita & T. Shinmura, "Numerical modeling of the transient liquid phase bonding process of Ni using Ni-B-Cr ternary filler metal", Journal of phase equilibria, vol. 20, pp. 199-206, 1999.

[21] O. Ojo, N. Richards & M. Chaturvedi, "Isothermal solidification during transient liquid phase bonding of Inconel 738 superalloy", Science and Technology of Welding & Joining, vol. 9, pp. 532-540, 2004.

[22] W. Li, T. Jin, X. Sun, Y. Guo, H. Guan & Z. Hu, "Study of Ni–Cr–Co–W–Mo–B interlayer alloy and its bonding behaviour for a Ni-base single crystal superalloy", Scripta materialia, vol. 48, pp. 1283-1288, 2003.

[23] J. Liu, T. Jin, N. Zhao, Z. Wang, X. F. Sun, H. R. Guan & Z. Q. Hu. Effect of temperature on formation of borides in TLP joint of a kind of nickel-base single crystal superalloy. in Materials science forum, 2007.

[24] O. Ojo, N. Richards & M. Charturvedi, "Effect of gap size and process parameters on diffusion brazing of Inconel 738", Science and Technology of Welding & Joining. vol. 9, pp. 209-220, 2004.

[25] M. Pouranvari, A. Ekrami & A. Kokabi, "Microstructure–properties relationship of TLP-bonded GTD-111 nickel-base superalloy", Materials Science and Engineering: A. vol. 490, pp. 229-234, 2008.

[26] M. Pouranvari, A. Ekrami & A. Kokabi, "Diffusion induced isothermal solidification during transient liquid phase bonding of cast IN718 superalloy", Canadian Metallurgical Quarterly. vol. 53, pp. 38-46, 2014.