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利用高温淬火相变仪测定DH36钢的不同冷却速度下的温度-膨胀曲线,采用膨胀法结合金相组织观察测定该钢的CCT曲线,分析不同的冷却速度对夹杂物尺寸、数量和钢中组织的影响。结果表明,获得针状铁素体的冷却速度范围在0.3~3℃/s,1℃/s为最佳冷速。随着冷却速度的提高,夹杂物数目先增大后减小再增大。试验钢种夹杂物的尺寸主要集中在0~2μm,适合诱发针状铁素体。并不是随着夹杂物的数目增多,针状铁素体的形核能力一直增大,而是夹杂物的数目与铁素体的形核能力有一个最佳的匹配范围。
The temperature-expansion curves of DH36 steel at different cooling rates were measured by high-temperature quenching phase-change apparatus. The CCT curves of the steel were measured by dilatometry and microstructure observation. The effects of different cooling rates on the size and quantity of inclusions, Impact. The results show that the acicular ferrite cooling rate range of 0.3 ~ 3 ℃ / s, 1 ℃ / s is the best cooling rate. With the increase of cooling rate, the number of inclusions first increases then decreases and then increases. Test steel inclusions size mainly concentrated in 0 ~ 2μm, suitable for inducing acicular ferrite. Not as the number of inclusions increases, the nucleation ability of acicular ferrite has been increased, but the number of inclusions and ferrite nucleation ability has an optimal matching range.