The methods for low-cycle fatigue testing and cyclic crack growth testing of 10GN2MFA steel at 20 and 270°C are described. Based on test results, fatigue crack growth rate curves are plotted and the characteristics of low-cycle plastic deformation and fracture are found. A difference in the kinetics of low-cycle plastic deformation is shown – the cyclic softening at 20°C and hardening at 270°C – which has an influence on fatigue life and fatigue crack growth resistance of this steel. The last-mentioned characteristic has been studied using two test methods: (i) with a decreasing stress intensity factor range and (ii) with a constant magnitude of load.

中文翻译：

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关于疲劳裂纹扩展速率与裂纹尖端塑性变形和断裂的关系的研究。第1部分。10GN2MFA钢的测试方法和结果

描述了10GN2MFA钢在20和270°C下的低周疲劳测试和循环裂纹扩展测试的方法。根据测试结果，绘制疲劳裂纹扩展速率曲线，并发现低周塑性变形和断裂的特征。显示了低循环塑性变形动力学的差异– 20°C时的循环软化和270°C时的硬化–这会影响该钢的疲劳寿命和抗疲劳裂纹扩展性。使用两种测试方法研究了最后提到的特性：（i）应力强度因子范围减小，并且（ii）载荷大小恒定。