Anew method for assessing the structural stability of nickel-base refractory alloys is suggested. The method is based on determination of the parameter of phase stability and allows for the dynamics of the degradation of structure and the temperature-and-time test conditions. The parameter of structural stability is computed using the results of a study of 300 grades of domestic and foreign heat-resistant nickel alloys. Dependences of the ultimate strength on the Larson–Miller parameter are plotted. It is shown that the new method reflects correctly the stability of the structure of refractory nickel alloys, especially those with a modern alloying system, as compared to conventional estimation of the temperature of complete dissolution of the main hardening phase.

提出了一种评估镍基耐火合金结构稳定性的新方法。该方法基于相稳定性参数的确定，并考虑到结构退化的动力学以及温度和时间测试条件。结构稳定性参数是根据国内外300个耐热镍合金牌号的研究结果计算得出的。绘制了极限强度对拉森-米勒参数的依赖性。结果表明，与传统的主要硬化相完全溶解温度的估计相比，新方法正确地反映了难熔镍合金的结构稳定性，特别是那些具有现代合金系统的合金。