论文部分内容阅读
用Q345A钢在实验室轧机和Gleeble3800热模拟试验机上,研究了中间坯冷却+回温的新型TMCP轧制工艺对低碳钢厚板表层组织的影响。应用TecnaiG220透射电镜观察了组织,探讨了组织细化机制。结果表明,钢板经过中间坯冷却+回温轧制后,可在距钢板表面2 mm内得到超细铁素体晶粒,晶粒平均直径在1μm左右,其间弥散分布着少量珠光体,靠近心部组织和常规TMCP轧制相似,是块状铁素体+珠光体的整合组织。表层组织超细化是多次相变细化作用的结果。
In the laboratory mill and Gleeble 3800 thermal simulator, Q345A steel was used to study the effect of the TMCP rolling process on the superficial microstructure of mild steel plate. TecnaiG220 transmission electron microscopy was used to observe the tissue refinement mechanism. The results show that after the steel plate is cooled and tempered by the intermediate billet, ultrafine ferrite grains can be obtained within 2 mm from the surface of the steel plate. The average diameter of the grains is about 1 μm. A small amount of pearlite dispersedly distributed near the heart Tissue organization is similar to conventional TMCP rolling and is an integrated organization of massive ferrite + pearlite. Superfine microstructure is the result of multiple phase transformation refinement.