在宏观力学性能与微观断裂模式相结合的基础上建立了断裂特征图。用它描述了12Cr1MoV钢在疲劳蠕变交互作用下的力学行为,并可用它了解断裂机构的主要因素及断裂(断裂寿命、应变速率)的变化规律。12Cr1MoV钢在588℃下的蠕变抗力较弱,它与疲劳抗力的比接近1。该材料的特征图上表现出较宽的FC(疲劳蠕变交互作用区),容易出现FCC(裂纹疲劳形核,蠕变扩展及断裂)断裂模式。经540℃,2×10~5h使用后,材料的疲劳蠕变交互作用性能剧烈降低,断裂模式也发生变化。
The fracture map was constructed on the basis of the combination ofmacro-mechanical properties and micro-fracture model. The mechanical behaviourunder fatigue-creep interaction (FC) of 12Cr1MoV steel and all the information, in-cluding fracture life, strain rate and main factors controlling fracture model (FF,FCF, CFF,FCC, CFC, CC), may be described on the map. The 12Cr1MoV steel has weakresistance at 588℃, which is in the ratio of 1 to fatigue resistance. An FC regionoccurs widely on the map of the steel, saying, the FCC (fatigue crack nucleation,creep propagation and fracture) fracture model may be relatively easily appeared.After the steel was in the service for steam pipe at 540℃ for 2×10~5 h, the FCproperties are remarkably reduced and the fracture model changes too.
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