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本文根据热轧20g钢板形变时效后的冲击韧性经常达不到标准要求的3.5公斤·米/厘米~2的实际生产情况,研究了热轧20g钢板形变时效动力学及控制轧制工艺参数对形变时效效应的影响,以探讨控制轧制对AlN析出的作用;研究了热轧20g钢板形变时效后的冲击韧性常低于标准要求的原因,控制轧制工艺通过铁素体晶粒的细化,对形变时效前后的脆性转化温度及冲击韧性的影响,探讨利用控制轧制来改善锅炉钢板的组织及形变时效后的冲击韧性的可能性及适宜性。实验结果表明:形变时效显著提高FATT及ITT,显著降低韧性状态的冲击功,因而显著降低冲击韧性,形变时效后的FATT及ITT随d~(-1/2)增大而降低,形变时效后的冲击韧性随d~(-1/2)增大而提高,因此,控制轧制也适用于锅炉钢板的生产。本文根据所得到的实验结果,得出六点有关锅炉钢板控制轧制的初步结论。
Based on the fact that the impact toughness of hot-rolled 20g steel after deformation aging often does not meet the standard requirements of 3.5 kg · m / cm ~ 2 actual production, the study of the hot-rolled 20g steel sheet deformation aging kinetics and control of rolling process parameters on the deformation The effect of controlled rolling on the AlN precipitation was studied. The reason that the impact toughness of hot-rolled 20g steel sheet was often lower than the standard requirements was studied. The control rolling process was characterized by the refinement of ferrite grains, On the brittle transition temperature and impact toughness before and after deformation aging, and to explore the possibility and suitability of using controlled rolling to improve the structure and the impact toughness of the boiler plate after aging. The experimental results show that: the deformation aging significantly increases FATT and ITT, significantly reduces the impact energy of the ductile state, thereby significantly reducing the impact toughness, FATT and ITT after deformation aging decreases with increasing d ~ (-1/2) The impact toughness increases with d ~ (-1/2), so controlled rolling is also suitable for the production of boiler steel. Based on the experimental results obtained, this paper draws six preliminary conclusions about the control rolling of boiler steel plate.