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Conventional vs. temperature-gradient transient liquid phase bonding of stainless steel 304 using a multi-component (Fe–Ni–Mo–B) filler metal

Jabbari, F ; Sharif University of Technology | 2022

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  1. Type of Document: Article
  2. DOI: 10.1007/s11661-022-06817-9
  3. Publisher: Springer , 2022
  4. Abstract:
  5. The application of the multi-component Fe-based filler metals (FMs) for transient liquid phase (TLP) bonding of AISI 304 austenitic stainless steel has been overshadowed by dissimilar interlayers merely due to their shorter isothermal solidification time. However, the latter usually suffers from low efficiency in terms of mechanical properties even after homogenization of heat treatment. This study shows that by imposing a temperature gradient across the bond line during the TLP bonding process (TG-TLP), it is possible to reduce the isothermal solidification time significantly. This renews the interest in utilizing multi-component Fe-based FMs. In this regard, the TG-TLP bonding process was carried out on the AISI 304/Fe–Ni–Mo–B/AISI 304 system at different holding times and compared to those of the conventional TLP (C-TLP) bonding case. Results revealed that the TG-TLP bonding scenario benefits from a fast isothermal solidification, making that the implementation of the multi-component Fe-based FMs is cost and time effective. Moreover, the absence of the boride precipitates in the diffusion-affected zone (DAZ) of the base material (BM), along with the formation of a joint region with a chemical composition comparable to that of the BM, eliminates the need for homogenization post-processing. These features of the TG-TLP bonding process, in tandem with a non-planar interface, led to a joint with shear strength efficiency of 100 pct fractured from the BM. The lessons learned from the explored fast isothermal solidification mechanism and lack of boride formation phenomenon in the DAZ can also be applied to the TG-TLP bonding of other steels and Ni-based superalloys. Graphical abstract: [Figure not available: see fulltext.] © 2022, The Minerals, Metals & Materials Society and ASM International
  6. Keywords:
  7. Austenitic stainless steel ; Borides ; Chemical bonds ; Efficiency ; Filler metals ; Isotherms ; Nickel alloys ; Solidification ; Thermal gradients ; AISI 304 ; Base material ; Bonding process ; Diffusion-affected zone ; Fe-based ; Isothermal solidification ; Multicomponents ; Solidification time ; Stainless steel-304 ; Transient liquid-phase bondings ; Fillers
  8. Source: Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science ; Volume 53, Issue 11 , 2022 , Pages 4081-4100 ; 10735623 (ISSN)
  9. URL: https://link.springer.com/article/10.1007/s11661-022-06817-9