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采用OM、TEM、和全自动相变仪等实验手段,研究了不同冷却速率和中间处理温度对微合金化耐火钢中铁素体的影响。结果表明:将冷却速率控制在10~30℃/s时,组织中均匀地分布着大量的针状铁素体,其平均宽度约为1μm。组织中的针状铁素体的板条束以平行态存在。终冷保温处理可以使Nb、V的碳氮化物进一步析出,将实验钢在600℃保温300 s,材料的组织为粒状贝氏体和细小的针状铁素体,但随着中间处理温度的升高,针状铁素体的板条束呈现宽化趋势,且数量下降。
The effects of different cooling rates and intermediate treatment temperature on ferrite in microalloyed refractory steel were studied by means of OM, TEM and automatic phase change instrument. The results show that when the cooling rate is controlled at 10 ~ 30 ℃ / s, a large amount of acicular ferrite is uniformly distributed in the microstructure with an average width of about 1μm. The acicular ferrite laths in the tissue exist in parallel. The final cold-holding heat treatment can further precipitate carbonitride of Nb and V, the experimental steel is kept at 600 ℃ for 300 s, the microstructure of the material is granular bainite and fine acicular ferrite, but with the intermediate treatment temperature Increased, acicular ferrite laths show a trend of widening, and the number decreased.