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研究了短期时效处理对HR3C合金显微组织和显微硬度的影响。结果表明:合金在600~750℃时效分别保温1、5 h后,其晶粒尺寸比合金仅在1200℃/30 min固溶处理后的尺寸显著细化。随着时效温度升高,晶粒尺寸略有减小,且时效5 h后减小的更为明显。在短期时效过程中,HR3C晶界上析出M_(23)C_6碳化物,随保温温度的升高和保温时间的延长,碳化物数量略微增加,尺寸变化不大。同时纳米Z相在晶内开始形核并长大。与固溶态相比,短期时效处理后合金的显微硬度有所提高;延长保温时间,合金的显微硬度基本保持稳定。
The effect of short-term aging treatment on microstructure and microhardness of HR3C alloy was studied. The results show that the grain size of the alloy after aging at 600-750 ℃ for 1.5 h is significantly smaller than that of the alloy after solution treatment at 1200 ℃ for 30 min. As the aging temperature increases, the grain size decreases slightly, and decreases more obviously after 5 h aging. In the short-term aging process, M_ (23) C_6 carbides were precipitated on the grain boundaries of HR3C. With the increase of holding temperature and holding time, the amount of carbides increased slightly and the size did not change much. At the same time, the nano-Z phase begins to nucleate and grow in the crystal. Compared with solid solution, the microhardness of the alloy after short-term aging treatment increased; prolonging the holding time, the microhardness of the alloy basically remained stable.