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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.
The high temperature and low cycle fatigue behavior of K40S cobalt superalloy controlled by strain at 700 ℃ and 900 ℃ are studied.The cyclic stress-strain data and strain-fatigue life data are analyzed, then the K40S alloy is given here Temperature range.The results show that K40S alloy has excellent high temperature and low cycle fatigue performance compared with the conventional X-40 alloy.The stress-strain response behavior of the alloy exhibits cyclic strengthening at 700 ℃, ℃, the initial strengthening and subsequent softening, and with the increase of the total strain amplitude, the strengthening effect is enhanced.The above behavior is attributed to the dislocation-dislocation in the cyclic deformation process, the dislocation-precipitation phase and the interaction between the solute atoms effect.