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金属学报  2002 

K40S钻基高温合金的高温低周疲劳行为Ⅰ.疲劳性能

, PP. 1047-1052

Keywords: 钴基高温合金,高温低周疲劳,位错

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Abstract:

研究了K40S钴基高温合金在700℃和900℃温度条件下由应变控制的高温低周疲劳行为.对循环应力-应变数据和应变-疲劳寿命数据进行了分析,进而给出了K40S合金在此温度范围的疲劳参数.结果表明与传统X-40合金相比,K40S合金具有优异的抗高温低周疲劳性能;合金的应力-应变响应行为在700℃时,呈现为循环强化,而在900℃时,为初期强化随后软化,且随着总应变幅的增加,强化效果均增强.上述行为归因于循环形变过程中位错-位错,位错-析出相及固溶原子间的相互作用.

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