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把12％Cr—Mo—V—Nb钢的Ni含量增加到2.6％,并对其机械和高温性能的影响进行了观察,发现增加Ni含量对室温下的冲击性能有所改善。但对高温低一应变和蠕变断裂强度有不良影响。我们把500℃持续应力下的蠕变试样进行了金相观察,并考察了应变与持续时间的影响。我们力图把组织观察与低应变率、蠕变断裂强度建立一定的关系。许多年来,一般的12％Cr钢在高温下使用很普遍,特别是用于透平叶片及有关部件。
The Ni content of 12% Cr-Mo-V-Nb steel was increased to 2.6%, and its mechanical and high temperature properties were observed. It was found that increasing the Ni content improved the impact properties at room temperature. However, it has an adverse effect on high temperature, low strain and creep rupture strength. We conducted a metallographic examination of the creep specimens at a constant temperature of 500 ° C and examined the effects of strain and duration. We tried to establish a certain relationship between the microstructure observation and the low strain rate and creep rupture strength. For many years, common 12% Cr steels have found widespread use at high temperatures, especially for turbine blades and related components.