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采用高温热处理炉对超超临界电站锅炉用HR3C合金进行短时时效和650℃×500h时效,研究了时效对合金微观组织和冲击韧度的影响。结果表明,短时时效后,晶内存在少量一次大块NbCrN相,同时有少量细小的Z相析出。在650℃×500h时效后,晶内析出更多细小的Z相,经短时时效,合金晶内的Z相更多,其弥散强化提高了合金的显微硬度;晶界析出M23C6相并进一步粗化长大,晶界附近有弥散块状的M_(23)C_6相析出。长期时效后,固溶态和短时时效态合金的冲击韧度降低,断口沿晶断裂。
The effect of aging on the microstructure and impact toughness of HRC alloy was investigated by using high temperature heat treatment furnace for short time aging and aging at 650 ℃ for 500h. The results show that there is a small amount of bulk NbCrN phase in the grain after a short time aging, and a small amount of fine Z phase precipitates at the same time. After aging at 650 ℃ for 500h, more fine Z phases precipitated in the grains. After short aging, there were more Z phases in the alloy grains, and the dispersion strengthened the microhardness of the alloy. The grain boundary precipitated the M23C6 phase and further Coarsening and growth, the grain boundary near the M_ (23) C_6 phase precipitates precipitated. After long-term aging, the impact toughness of the solid-solution and short-time-aged alloys decreases, and the fracture intergranular fracture.