Determining the Influence of Braze Temperature on the Dissolution Behaviour and Kinetics of Isothermal Solidification During Transient Liquid Phase Bonding (TLPB) Ni-Based Superalloys

Corbin, Stephen F.; Tadgell, Colin A.

doi:10.1007/s11661-021-06143-6

Cited by 5 publications

(1 citation statement)

References 15 publications

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“…The existence and amount of undesirable phases can be limited by the suitable choice of the joint clearance, the proper selection of brazing parameters (i.e., temperature and time [ 16 , 17 , 18 , 19 ]) to prolong isothermal solidification stage and/or the followed post-heat treatment [ 20 , 21 ]. A method for optimizing the brazing temperature allowing the shortest isothermal solidification time to be obtained, considering a widening of the gap due to the substrate dissolution during brazing, was proposed recently by Corbin and Tadgell [ 22 ]. It was applied to the investigation of the Inconel 718–Ni-Pd-Cr-B-Si BFM pair [ 23 ].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties of Structural Components in Hastelloy X Joints Brazed with Ni-Pd-Cr-B-Si Alloy

Baranowski

Senkara

2023

Materials

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The brazing of structural high-temperature-resistant nickel alloys is a predominant method in manufacturing jet engines in the aircraft industry. Ni-Cr-base brazing filler metals (BFMs) containing B and Si as the melting point depressants are used for this purpose. The presence of the latter can lead to the formation of brittle constituents in the joints, decreasing their strength, toughness and creep resistance. The structures of Hastelloy X nickel superalloy joints brazed with Palnicro 36M BFM are presented in this paper along with the mechanical properties of their particular phases as a function of brazing time. Indentation hardness, Martens hardness, reduced modulus and creep coefficient were measured using the instrumented indentation method. The elastic part of the indentation work was also calculated. Pd forms an unlimited solution with Ni, but its high content in BFM does not fundamentally change the general joint structure known from other Ni-superalloy–Ni-BFM systems. However, new Pd-containing phases are emerging. The hardest components were Ni-B and Cr-B boride phases and Pd-Ni-Si phase in MZ and the boundary of DAZ and BM. MZ reduces the plasticity of a joint to the highest extent. The hardness of particular parts in the joints and the elastic portion of the indentation work decreased with the increase in brazing time, while the reduced modulus of the indentation contact and indentation creep increased. The results of indentation creep measurements indicate that all structural components of the joints were less susceptible to creep than the parent material at room temperature.

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