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OALib Journal期刊
ISSN: 2333-9721
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长期时效对GH4169合金动态拉伸变形行为的影响
DOI: 10.3724/SP.J.1037.2011.00435, PP. 49-55
Keywords: GH4169合金,长期时效,动态载荷,变形行为
Abstract:
研究了长期时效对GH4169合金的显微组织和动态拉伸性能及变形行为的影响规律及机制.结果表明,应变速率为101-102s-1时,合金强度受时效时间影响显著,断裂延伸率随时效时间的延长呈降低趋势,在时效500h后基本保持不变;高应变速率(103s-1)条件下,长期时效对合金强度无明显影响,而断裂延伸率受时效时间的影响显著,长期时效造成的合金塑性劣化现象提前发生.高应变速率变形过程中,位错运动受阻来不及释放,在时效0-1000h范围内,合金未出现强化相峰值尺寸效应,强度受时效时间的影响并不明显.长期时效后GH4169合金晶界$\delta$相附近无析出带的产生,导致动态载荷下晶界塑性变形的协调能力降低,应变速率为103s-1时,合金塑性在短时间时效后迅速下降.
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