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本文介绍了在14种不同的气体介质中,对lnconel7.8合金试样进行的650℃下疲劳裂纹增长速率的测定。介质中的少量氧或硫都使裂纹增长速率大大提高。支配介质对裂纹增长产生影响的变量是动力学因素而不是热力学因素。显著提高裂纹增长速率的介质对未受力的试样并不产生明显的腐蚀侵蚀。因而常规的高温腐蚀试验也许不能用于预测受力元件的使用性能。
This article describes the determination of fatigue crack growth rate at 650 ° C for lnconel 7.8 alloy specimens in 14 different gas media. A small amount of oxygen or sulfur in the medium greatly increases the crack growth rate. The variables governing the effect of media on crack growth are kinetic rather than thermodynamic. Media that significantly increase the rate of crack growth do not produce significant erosion of the unstressed specimens. Thus conventional high temperature corrosion test may not be used to predict the performance of the force components.