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研究了两种不同成分的低碳钢在600℃条件下经不同时间回火处理后的硬度变化,并对600℃回火18 h的样品析出物进行组织观察、TEM观测及粒度统计。结果表明:C-Nb钢和C-Cu-Nb钢在600℃条件下,短时间回火硬度趋势相反,长时间回火硬度趋势平缓,说明Cu和Nb的析出过程独立存在,析出时间和规律不同;C-Cu-Nb钢中Nb析出物颗粒尺寸明显大于C-Nb钢,说明Cu的添加促进了Nb析出物的长大。
The changes of hardness of low carbon steel with two different compositions after tempering at 600 ℃ for different time were studied. Microstructure, TEM observation and grain size statistics of the samples precipitated at 600 ℃ for 18 h were studied. The results show that the tempering hardness of C-Nb steel and C-Cu-Nb steel is opposite at 600 ℃ for a short time and the tempering hardness tends to be gentle for a long time, indicating that the precipitation process of Cu and Nb exists independently and the precipitation time and regularity . The grain size of Nb precipitates in C-Cu-Nb steel is obviously larger than that of C-Nb steel, indicating that the addition of Cu promotes the growth of Nb precipitates.