Ti微合金化汽车大梁钢510L的组织性能

通过层流冷却及卷取过程模拟实验和实验室热轧实验研究了冷却工艺参数对Ti微合金化汽车大梁钢510L组织性能的影响规律，并在生产现场进行了工业试制.结果表明，大冷速有利于弥散细小的TiC粒子析出，冷速和终冷温度对实验钢强度的影响是细晶强化、析出强化和相变强化共同作用的结果，N含量显著影响Ti的析出强化效果，在冶炼时应严格控制钢中的N含量，否则将对钢板的性能产生较大的影响.实现了低成本Ti微合金化汽车大梁钢510L的批量稳定生产.

Microstructure and Properties of Ti Microalloyed Automobile Frame Steel 510L

The effects of cooling process parameters on microstructure and mechanical properties of Ti microalloyed automobile frame steel 510L were studied by laminar cooling， coiling process simulation experiment and laboratory hot rolling experiment. Industrial trial production was made at the production site. The results showed that great cooling rate is advantageous to the precipitation of dispersed and fine TiC particles. The effects of cooling rate and final cooling temperature on the strength of the experimental steel include the joint action of precipitation strengthening， fine grain strengthening and phase transformation strengthening. N content significantly influences the precipitation strengthening effect of Ti. The N content in the steel should be strictly controlled during smelting， otherwise it will have a great influence on the properties of the steel plate. Mass stable production of Ti microalloyed automobile frame steel 510L with low cost has been realized.