Mechanical Properties and Fracture Behavior of Laser Powder-Bed-Fused GH3536 Superalloy

Abstract

Heat treatment (HT) is an important approach to tune the structure and mechanical properties of as-printed or hot-isostatic-pressed (HIPed) additive manufacturing materials. Due to the carbide precipitates extensively existing after HT with air cooling, this paper studies the microstructure and mechanical behavior of laser powder-bed-fused (L-PBFed) GH3536 superalloy with laminar carbide precipitates at grain boundaries. By comparing with air-cooling samples and water-quenched samples, the results revealed that air cooling often introduced precipitates at grain boundaries, which impede the plastic deformation and are prone to lead to severe transgranular cracks on the fracture surface, contributing to a higher strain-hardening rate but lower ductility of HTed sample. Water quench can largely eliminate the grain-boundary precipitates, contributing to an optimized ductility even with smaller grain size. This work provides more details on the precipitate-deformation relation after HT.

Thermal Deformation Characteristics and Dynamic Recrystallization Mechanism of Incoloy 800H Alloy under Different Deformations

“…According to AZtecCrystal software, the GOS under different degrees of deformation was statistically analyzed, as shown in Figure 5a. Due to the lower GOS value of DRX grains than deformed grains, based on the experience of previous research [38][39][40][41] and the statistics of the collected data, a threshold value of 1.2°was used to separate recrystallized grains and deformed grains in this study.…”

Effect of forming angle on the microstructure and properties of GH3536 nickel-based superalloy formed by SLM

“…Favored by many scholars because of its strong robustness to high temperatures, this alloy can work at a temperature near 900°C without a significant deterioration in mechanical properties and even work at higher temperatures for a short period of time. Therefore, it is suitable for producing the hot-end parts intended to work at high temperatures, such as combustion chamber components, vortexers, engine blades and others (Chen et al , 2018 and Ni et al , 2022). However, such parts are usually complex in structure, and they are often riddled with internal runners or pores (Maria et al , 2020).…”