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本文研究了4Cr_(14)Ni_(14)W_2Mo耐热合金钢等材料屈服应力随温度的变化规律,给出了σ_s(T)—T实验曲线,并对实验结果作出唯象解释。最后还探讨了判断疲劳断裂类型的热力学判据σ_r(t)/σ_s(t)。
In this paper, the variation law of yield stress with temperature of 4Cr_ (14) Ni_ (14) W_2Mo heat-resistant alloy steel was studied. The σ_s (T) -T experimental curve was given and the experimental results were explained phenomenologically. Finally, the thermodynamic criterion σ_r (t) / σ_s (t) for judging the type of fatigue fracture is also discussed.