Influence of final cooling temperature on the microstructure and mech-anical properties of Ti microalloyed automobile beam steel
In order to reveal the influence of final cooling temperature on microstructure and mechanic-al properties of Ti-microalloyed automobile 510L beam steel,the hot rolling and laminar cooling(LC)experiment was conducted on 0.11C-1.20Mn-0.055Ti beam steel.The experimental results showed that with the final cooling temperature decreasing,the strength of the steels decreased and the elongation in-creased.Moreover,the ratio of equiaxed ferrite in the steel decreased while the ratio of pearlite in-creased.And the average grain gradually refined.The TEM observation results showed that the precipit-ation of dispersed and fine particles was cubic structure TiC particles in the Ti-microalloyed automobile 510L beam steel.The number density of TiC particles decreased with decreasing the final cooling tem-perature.The effects of final cooling temperature on the strength of the 510L beam steel combine pre-cipitation strengthening and fine grain strengthening.
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