研究了镍基定向凝固高温合金DK3和普通铸造合金K3在760℃应变控制和应力控制下的高温低周疲劳行为。结果表明:这两种合金的高温低周疲劳行为可以用常规的应力疲劳曲线来表征。DK3合金不存在“过渡疲劳寿命”N_T,K3合金则很低。在各种不同应变或应力水平下,DK3合金的低周疲劳寿命高于K3合金,当应力水平为785至980MPa时,其寿命约差1倍,当应力水平为490至685MPa时,则差2倍多。
The high temperature low cyclic fatigue (LCF) behaviour of a directionally solidified Ni-base alloy DK3 has been studied under strain-controlled and stresscontrolled at 7600℃ in comparison with a conventional cast alloy K3. It was found that for both alloys, their behaviours may be characterized by the conventional stress fatigue curve. The intersections of elastic and plastic lines, so-called "transitional fatigue life", N_T, is absence for alloy DK3 and a little for K3. Under various strain and stress load, LCF life of alloy DK3 is longer than that of K3. When the stress level reduces from 980 to 785 MPa, the difference between the lives of both alloys is about 2 times; when stress level from 685 to 490 MPa, the difference increases more than 3 times.
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