Comparative Study of Prior Particle Boundaries and Their Influence on Grain Growth during Solution Treatment in a Novel Nickel-Based Powder Metallurgy Superalloy with/without Hot Extrusion
نویسندگان
چکیده
The prior particle boundaries (PPBs), as one of the typical defects in nickel-based powder metallurgy superalloy, largely affect microstructure and thus properties/performance alloys. However, effect PPBs on evolution superalloy during heat treatment is still unclear. In this paper, a comparative study their influence grain growth solution novel FGH4113A (i.e., WZ-A3 from Shenzhen Wedge, China) with/without hot extrusion (HEX) was conducted. Firstly, through combination scanning electron microscope (SEM), probe microanalyzer (EPMA) transmission (TEM) techniques, alloys were characterized to be Al2O3, carbides (TiC, M6C, M23C6) large-size γ′ particles. After HEX, oxides broke, deformed, phase redistributed. at 950 °C, TiC decomposed M6C M23C6, while no such decomposition occurred after treated 1050 °C 1150 °C. Secondly, size analyzed using backscattered diffraction (EBSD) technique. At carbide resulted increase enhancement pinning boundaries, inhibiting growth. nucleation rate due recrystallization comparable rate, leading stable distribution size. While higher temperature can induce content PPBs. driving force for surpassed PPBs, making grains quickly coarsen. Finally, it concluded that HEX process an effective method modify HIP heavily refine superalloys. Furthermore, based present experiment analysis, appropriate mechanism 2 h) proposed
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ژورنال
عنوان ژورنال: Metals
سال: 2022
ISSN: ['2075-4701']
DOI: https://doi.org/10.3390/met13010017