CSP工艺冷轧微碳钢组织演变研究

采用CSP热轧板为原料,设计了两个成分的微碳钢,对其生产加工过程中的热轧样、冷硬样、退火样及平整后的样板进行了金相显微镜和扫描电镜观察,研究了各个加工过程中金相组织变化、晶粒度变化及Fe3C的析出演变规律。结果表明:CSP热轧板组织均由铁素体和不连续链状碳化物组成,冷轧退火后链状碳化物逐渐均匀,并成连续链状分布在晶界上;碳含量对组织晶粒度有一定影响。

Analysis of Microstructure Evolution of Micro-Carbon Cold-Rolled Steel by CSP Process

An investigation has been carried out on the two types of CSP microcarbon steel of different compositions with the same thin slab.After hot rolling, cold rolling, annealing and skin-passing, the samples were investigated by means of metalloscope and SEM methods to study the microstructure evolution , grain size change and precipitates during the processing.The results showed that the final microstructure of the CSP steel was found to consist of ferrite grains and a few discontinuity chain-like carbide precipitates on grain boundary .The carbide organization was homogenized and distributed on grain boundary after annealed .The C contents had certain effect on the grain size .