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The effect of outgassing behaviour of a Ni-based superalloy powder
Powder Metallurgy ( IF 1.4 ) Pub Date : 2020-09-14 , DOI: 10.1080/00325899.2020.1820665
Q. Chen 1 , J. Yang 1, 2 , G. Feng 1, 2
Affiliation  

ABSTRACT In this work, the powder of a Ni-based superalloy (EP741NP) was sieved into two batches, one with coarse powder (63–150 μm), and the other containing fine powder (25–63 μm). The effects of holding time, temperature, and vacuum level on the outgassing behaviours of these powders were investigated. The results indicated that the coarse and fine powders were most efficient at outgassing when holding at low temperatures (200–300°C) and vacuum for 4 and 24 h, respectively. Unde those conditions, 22% and 16% decreases in oxygen were recorded respectively. The structures and compositions of the oxides formed on the powders’ surfaces were analysed via thermodynamic calculations and by SEM/EDX/XPS. The porous surface oxide layers identified in both cases at 400°C/800°C in air mainly consist of aluminium oxide, with Cr and Ti, participated in the oxide formation.

中文翻译:

镍基高温合金粉末脱气行为的影响

摘要 在这项工作中,镍基高温合金 (EP741NP) 的粉末被分成两批,一批含有粗粉 (63-150 μm),另一批含有细粉 (25-63 μm)。研究了保温时间、温度和真空度对这些粉末脱气行为的影响。结果表明,粗粉和细粉分别在低温 (200-300°C) 和真空下保持 4 小时和 24 小时时除气效率最高。在这些条件下,氧气分别减少了 22% 和 16%。通过热力学计算和 SEM/EDX/XPS 分析了在粉末表面形成的氧化物的结构和成分。在空气中 400°C/800°C 两种情况下确定的多孔表面氧化层主要由氧化铝、Cr 和 Ti 组成,
更新日期:2020-09-14
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