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采用纳米显微力学探针 (NanoIndenterII)及透射电子显微镜 ,对使用不同时间的低合金耐热钢(12Cr1MoV)电厂主蒸汽管道的组织及性能进行分析研究。结果表明 :随着运行时间的延长 ,细小碳化物颗粒不断在铁素体基体中析出 ,使基体强化 ,管样显微硬度提高 ;但在晶界出现聚集长大的碳化物。若运行时间过长 ,最终可能因晶界碳化物的粗大而产生沿晶断裂。本文分析的已使用 30× 10 4 h的主蒸汽管道仍能继续运行使用。
The microstructure and properties of the main steam pipe of low alloy heat-resistant steel (12Cr1MoV) using different time were analyzed by using NanoIndenterII and transmission electron microscope. The results show that as the running time prolongs, the fine carbide particles continuously precipitate in the ferrite matrix, so that the matrix strengthens and the microhardness of the tube increases. However, carbide particles grow up on the grain boundaries. If the running time is too long, the final grain boundary carbide may be due to coarse and produce intergranular fracture. The main steam pipe that has been analyzed in this paper that has been used 30 × 10 4 h can still continue to operate.