Diffusion brazing of stainless steels influence of Ni-B filler alloy composition
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RESEARCH PAPER
Diffusion brazing of stainless steels influence of Ni-B filler alloy composition Alexander Alexandrovich Ivannikov 1 & Milena Alexeevna Penyaz 1 & Pavel Sergeevich Dzhumaev 1 & Diana Mikhailovna Bachurina 1 & Oleg Nikolaevich Sevriukov 1 Received: 23 December 2019 / Accepted: 12 October 2020 # International Institute of Welding 2020
Abstract Stainless austenitic (0.12C-18Cr-10Ni-Ti, wt-%) and ferritic-martensitic (0.16C-12Cr-Mo-Si-V-Nb-B, wt-%) steels were joined by transient liquid phase diffusion bonding (also called diffusion brazing) with the filler metals based on Ni-Cr-Si-(Fe)-B at 1160 °C for different bonding times from 15 to 40 min. It is shown that the braze joints have a heterogeneous diffusion zone with a boride network which is formed during isothermal solidification. The influence of the filler metals composition on the joint microstructure and tensile strength was studied. It is established that the initial concentration of boron and chromium in the filler metal plays an important role in the formation of the microstructure. It is shown that the use of the filler metal with the optimized composition of Ni-20Cr-7.5Si-4.5Fe-1.5B makes it possible to obtain the most homogeneous structure, leading to the best tensile strength of the joint of about 500 ± 40 MPa. Keywords TLP bonding . Diffusion brazing . Filler metal . Steel . BNi
1 Introduction The development of power engineering is inseparably associated with the development and introduction of new materials with improved properties, which, however, do not guarantee an increase in the performance characteristics of the final products. Schwartz [1] described in detail in his book that any complex product is created using various types of connections often requiring fundamentally different technological solutions. He revealed that in some cases, for example, for joining dissimilar materials, while connecting thin-walled structures or when it is necessary to create a connection in hard-to-reach places, brazing is definitely advantageous. Also, Peaslee [2] showed afterwards that brazing and welding prevail among other technologies. Back in 1992, MacDonald [3] considered a promising type of brazing—diffusion brazing
Recommended for publication by Commission XVII - Brazing, Soldering and Diffusion Bonding * Alexander Alexandrovich Ivannikov [email protected] 1
Department of Materials Science, National Research Nuclear University MEPhI, Moscow, Russia
or the same transient liquid phase bonding (TLP bonding). He defined it as a joining process when melting point depressant (MPD) diffuses from a thin liquid interlayer into the parent metal resulting in isothermal solidification. Kalin et al. [4] demonstrated that the use of rapidly quenched amorphous ribbon filler metals is a promising for diffusion brazing because the melt of such alloys has significantly higher diffusion and capillary activity in the brazing process compared to crystalline analogues, which ensures the formation of a high-quality joint. Amorphous filler metals can be o
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