The effect of different heat treatments and hot isostatic pressing on the microstructure and mechanical properties of laser powder bed fusion IN625 alloy was studied. The heat treatments were: stress relief annealing, recrystallization annealing and low-temperature solution treatment. The resulting microstructure and crystallographic textures were studied using optical and scanning electron microscopy. The mechanical properties of the as-built and post-treated IN625 alloy were obtained after tensile testing at room temperature and at 760 °C (1400 °F), and compared to those of an annealed wrought alloy of the same composition.

Effect of heat treatment and hot isostatic pressing on the microstructure and mechanical properties of Inconel 625 alloy processed by laser powder bed fusion

Anisotropic creep damage and fracture mechanism of nickel-base single crystal superalloy under multiaxial stress

Currently, additive manufacturing (AM) experiences significant attention in nearly all industrial sectors. AM is already well established in fields such as medicine or spare part production. Nevertheless, processing of high-performance nickel-based superalloys and especially single crystalline alloys such as CMSX-4® is challenging due to the difficulty of intense crack formation. Selective electron beam melting (SEBM) takes place at high process temperatures (~ 1000 °C) and under vacuum conditions. Current work has demonstrated processing of CMSX-4® without crack formation. In addition, by using appropriate AM scan strategies, even single crystals (SX SEBM CMSX-4®) develop directly from the powder bed. In this contribution, we investigate the mechanical properties of SX SEBM CMSX-4® prepared by SEBM in the as-built condition and after heat treatment. The focus is on hardness, strength, low cycle fatigue, and creep properties. These properties are compared with conventional cast and heat-treated material.

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Microstructure and Mechanical Properties of CMSX-4 Single Crystals Prepared by Additive Manufacturing

https://hal.archives-ouvertes.fr/hal-02073852/document

High temperature materials for aerospace applications: Ni-based superalloys and γ-TiAl alloys

Transmission electron microscopy investigations have been carried out in single crystal creep specimens of the nickel-based superalloy CMSX-4, deformed to different stages of their creep lives The microstructural background of creep anisotropy was observed at 1123 and 1253 K At the lower temperature, the pronounced creep anisotropy can be attributed to the superposition of coherency and external stresses, leading to different dislocation configurations At the higher temperature, the creep anisotropy for [001] and [011] load axes is reduced by γ′ rafting in these orientations

Orientation dependence of dislocation structures and deformation mechanisms in creep deformed CMSX-4 single crystals

/pdf/creep-deformation-anisotropy-in-single-crystal-superalloys-4pjs3iw70g.pdf

T. Khan

Papers

Creep Deformation Anisotropy in Single Crystal Superalloys