Effect of Ultra-fast Cooling on Microstructure and Mechanical Property of Vanadium Micro-alloyed Steel
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摘要: 在实验室进行了超快冷轧制、冷却试验，研究超快冷却对含钒微合金化钢组织和性能的影响规律，以及对组织均匀性的影响。结果表明，采用常规冷却工艺时，试验钢的表面组织为贝氏体和少量马氏体，心部组织为少量块状铁素体、贝氏体和马氏体；采用超快冷却工艺后，试验钢的表面组织为马氏体，心部组织为贝氏体和少量马氏体，试验钢的强度增加，塑性略有下降。对于20 mm厚的轧件，采用超快冷却工艺，轧件表面和心部呈现出不同的组织，出现冷却不均匀的现象。Abstract: Rolling and cooling experiments were conducted under ultra-fast cooling(UFC) condition to investigate the influence of UFC on microstructure(including homogeneity of microstructure) and mechanical property of vanadium micro-alloyed steel.Following UFC process,there is martensite on the surface and bainite and a small amount of martensite in the core of the specimen while with conventional cooling process,there is bainite and a small amount of martensite on the surface and a small amount of massive ferrite,bainite and martensite in the core of the specimen.The tested steel exhibits increase in strength and slight decrease in plasticity after UFC.Different microstructures and inhomogeneous cooling are observed on the surface and in the core of the 20 mm thick rolled pieces subject to UFC.
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