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OALib Journal期刊
ISSN: 2333-9721
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晶粒细化对K417G高温合金蠕变性能的影响
DOI: 10.11900/0412.1961.2014.00245, PP. 1384-1392
Keywords: 高温合金,晶粒尺寸,蠕变性能
Abstract:
研究了晶粒细化对K417G高温合金在760℃/645MPa,900℃/315MPa和950℃/235MPa下的蠕变性能的影响.结果表明,晶粒细化对合金蠕变性能的影响与温度和施加应力有关.在760℃/645MPa下合金的蠕变性能随晶粒细化而提高,变形以晶内变形为主;900℃/315MPa下的蠕变性能随晶粒细化先升高后降低,变形为晶内变形和晶界滑移竞争作用;950℃/235MPa下的蠕变性能随晶粒细化而降低,变形以晶界滑移为主.760℃/645MPa下,位错切过g'相,基体通道中没有位错网产生;900℃/315MPa和950℃/235MPa下位错通过Orowan机制绕过g'相,基体通道中产生位错网,并且M23C6在晶内析出.
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