Microstructure and mechanical properties of gas metal arc welded CoCrFeMnNi joints using a 308 stainless steel filler metal

Three-dimensional graphene-reinforced Cu foam interlayer for brazing C/C composites and Nb

Interfacial microstructure and mechanical properties of ZrB2SiCC ceramic and GH99 superalloy joints brazed with a Ti-modified FeCoNiCrCu high-entropy alloy

Ultra-high temperature ceramics: Aspiration to overcome challenges in thermal protection systems

The use of filler materials during fusion-based welding processes is widely used to regulate and modify the composition of the welded joints aiming at producing a desired microstructure and/or achieving an improvement in its mechanical performance. Welding of high entropy alloys is still a new topic and the impact of different filler materials on the microstructure and mechanical properties is yet unknown. In this work, gas metal arc welding of the CoCrFeMnNi high entropy alloy using 410 stainless steel as a filler wire was performed. The microstructural evolution of the welded joints was evaluated by optical microscopy, scanning electron microscopy aided by electron backscattered diffraction, high energy synchrotron X-ray diffraction and thermodynamic calculations. Meanwhile, the mechanical behavior of the welded joint, as well as the local mechanical response were investigated with microhardness mapping measurements and with non-contact digital image correlation during tensile loading to failure. The weld thermal cycle promoted solid state reactions in the heat affected zone (recovery, recrystallization and grain growth), which impacted the microhardness across the joint. The role of the 410 stainless steel filler material in the solidification path experienced by the fusion zone was evaluated using Scheil-Gulliver calculations, and a good agreement with the experimentally observed phases was observed. Despite the addition of the 410 stainless steel filler was not conducive to an increase in the fusion zone hardness, the associated bead reinforcement promoted an improvement in both the yield and tensile strengths of the joint compared to a similar weld obtained without filler material (355 vs 284 MPa and 641 vs 519 MPa, respectively). This allows to infer that the addition of filler materials for welding high entropy alloys is a viable method for the widespread use of these novel materials. In this work, by coupling microstructure and mechanical property characterization, a correlation between the processing conditions, microstructure and mechanical properties was obtained providing a wider basis for promoting the application of gas metal arc welding of high entropy alloys for industrial applications. • Gas metal arc welding using 410 stainless steel filler wire to join a CoCrFeMnNi high entropy alloy was performed. • Recrystallization followed by grain growth were the primary causes behind heat affected zone softening. • Existing phases predicted by thermodynamic calculations were in good agreement with those observed at the fusion zone. • Stress concentration at the weld toe is a dominant factor contributing to failure of welded joints. • Suitability of using filler materials for joining CoCrFeMnNi high entropy alloys is demonstrated. 

Microstructure and mechanical properties of gas metal arc welded CoCrFeMnNi joints using a 410 stainless steel filler metal

The ZrB 2 –20 vol.% SiC (ZS) composites were diffusion bonded to Nb using pure Ti interlayer. Effects of joining temperature on the microstructure and mechanical properties of the joints were investigated. The results show that Ti reacted with Nb and ZS to form a typical three layers in the joint. An in situ synthesized TiB whiskers array which consisted of two types of TiB was produced in the reaction layer. The formation mechanism of TiB was analyzed. Mutual diffusion between Ti and Nb led to a ductile β-(Ti, Nb) layer on Nb side. Joining temperature influenced the thickness of reaction layers and distribution of TiB seriously. The maximum shear strength reached 158 MPa with bonding temperature at 1200 °C for 60 min.

Diffusion bonding of ZrB2–SiC/Nb with in situ synthesized TiB whiskers array

An in situ short fiber reinforced brazing technique by taking advantage of reaction between ZrB2 and Ti has been developed for joining ZrB2–SiC ceramic and Ti6Al4V alloy. The Ag–Cu eutectic alloy was used as brazing interlayer to realize controllable growth of TiB in Ti-rich environment. The microstructural evolution of the joint was divided into four stages as experiments performed from 840°C to 920°C. The diffusion behaviors of Ti and B may play an important role on the preferential growth of TiB whiskers during brazing. The statistics of the length of TiB showed that a rapid growth appeared at 880°C. The accommodation to the coefficients of thermal expansion by TiB whiskers was evaluated and the shear strength of the joints was tested.

Microstructural Evolution and Growth Behavior of In Situ TiB Whisker Array in ZrB2–SiC/Ti6Al4V Brazing Joints

Microstructure and mechanical properties of ZrB2-SiC joints fabricated by a contact-reactive brazing technique with Ti and Ni interlayers

Influence of a Mo interlayer on the oxidation behavior of a Cr coating on a Zr alloy substrate

Electroplating assisted diffusion bonding of ZrC–SiC composite for full ceramic joints

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