Measurement of Continuous Cooling Transformation Curve and Effect of Cooling Rate on the Inclusion and microstructure of DH36 Steels
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摘要: 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。Abstract: The temperature-expansion curves under different of cooling rates of DH36 steels had been measured by high temperature phase transformation quenching instruments.The CCT curves of the steels had been determined by using the expansion method and observing the microstructure of the steels.The influence of different cooling rates on the inclusion size, quantity and microstructure had been studied.The results showed that the range of cooling rates for achieving acicular ferrite is 0.3~3℃/s and the optimum cooling rate is 1℃/s.With the increase of cooling rates, the number of the inclusions decreases first and then in-creases.The size of inclusion is mainly between 0~2 μm, and is suitable for inducing nucleation of acicular ferrite.The nucleation of acicular ferrite has not always been increased with the increase of inclusion num-ber.There is an optimal combination of number of inclusions and the nucleation of acicular ferrite.
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Key words:
- DH36 steel /
- CCT curves /
- cooling rate /
- AF /
- inclusions /
- organization
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