Influence of Cooling Speed on Microstructure of Nb-V Microalloyed High Strength Steel
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摘要: 以国内某厂新型微合金高强度钢的开发研究为背景，在THERMECMASTOR-Z热模拟试验机上对试验钢种进行加热、保温、冷却的热模拟试验；并利用Zeiss Axioplan2万能金相光学显微镜进行显微组织观察，分析比较了不同冷却速度对微合金高强度钢相变及组织的影响。试验结果表明，随着冷却速度的增大，相变开始温度和相变结束温度均有所下降，铁素体的含量逐渐减少，晶粒明显细化，相变区间也逐渐减小；与此同时，变形促进了相变的发生。Abstract: The experiments of a microalloyed high strength steel under heating, heat preservation and cooling at different speeds were conducted on the thermal-simulator of THERMECMASTOR-Z.And the microstructure was observed by Zeiss Axioplan2 universal metallographic optical microscope.The effects of cooling speed on microstructure and phase transformation of the microalloyed high strength steel were analyzed.It has been found that the temperature points and temperature range of phase transformation decrease with the increase of the cooling speed.The ferrite grain will be refined and the ferrite amount will decrease with the increase of cooling speed.At the same time, deformation can promote phase transformation.
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Key words:
- microalloyed steel /
- cooling speed /
- static CCT curve /
- microstructure
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