Supersolidus liquid phase sintering of Inconel 718 powder alloy
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摘要: 以惰性氣體霧化粉末為原料,采用超固相線液相燒結方法制備了Inconel 718粉末高溫合金,研究了粉末合金的燒結溫度和熱處理制度對合金組織和力學性能的影響.實驗結果表明:在1240℃真空燒結120min可以制備出相對密度為98.5%的粉末合金,后續的熱等靜壓處理可以將其相對密度提高到99.7%;經熱處理后,合金的抗拉強度和延伸率分別為1280MPa和9%;析出相為球形γ'相、針狀γ″相以及粗大的碳化物,平均晶粒大小在50μm以下.
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關鍵詞:
- Inconel 718合金 /
- 粉末高溫合金 /
- 超固相線液相燒結 /
- 熱處理
Abstract: Nickel base powder superalloy Inconel 718 was prepared from pre-alloyed powder by supersolidus liquid phase sintering. The results show that compacts with a relative density over 98% can be obtained by sintering at 1240℃ for 120 min in vacuum. The relative density of sintered samples could be increased to 99.7% by next hot isostatic pressing process. The tensile strength and ductility of heat-treated samples are 1 280 MPa and 9% respectively at room temperature. The precipitates are spherical γ' and needle γ' and coarse carbides, and the average grain size is below 50μm. -

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