Abstract:

The difference of mechanical properties of rolled CLF-1 steel plate was investigated by the means of chemical analysis, optical microscopy, scanning electron microscopy, transmission electron microscopy and so on. The results showed that the content of major chemical elements of two types of rolled plates were little different and accorded with specification. The grain size of 10mm rolled plate was smaller than 35mm rolled plate. The martensite laths width and volume fraction of precipitates of two plates were 200~350nm, 2.56%, 600~800nm, 1.98%, respectively. Thus, the differences of the primary austenite grain size, martensite laths width, volume fraction and size of precipitates between two kinds of rolled plates are the main reason which induces the variation of plates’ mechanical properties. These differences could be caused by forging and hot rolling deformation and the heat treatment parameters. Therefore, the total deformation of forging and rolling of different thickness plates should be equaled, and the parameters of heat treatment should be strictly controlled during fabricating the industrial production of CLF-1 steel plates.

Key words: Industrialization, CLF-1steel, Reduced activation ferritic/martensitic steel, Mechanical properties

摘要：

采用成分分析、金相显微镜、扫描电子显微镜和透射电子显微镜等分析测试方法，综合化学成分、显微组织和析出相等对工业化生产CLF-1钢轧板力学性能差异原因进行分析研究。研究结果表明，两种轧板主要化学元素含量相差较小并符合技术要求值；10mm轧板晶粒尺寸较35mm轧板偏小，两种轧板马氏体板条宽度分别为200~350nm、600~800nm，析出物体积分数分别为2.56%、1.98%。两种轧板原奥氏体晶粒尺寸、马氏体板条宽度、析出物体积分数和尺寸的差异是造成其力学性能差异较大的主要原因，而这些差异可能是由锻压和热轧变形量不同，热处理工艺参数不同所造成的。因此，在CLF-1钢轧板的工业化生产过程中必须保证不同厚度板材锻压和轧制的总变形量一致，并且严格控制热处理工艺参数。

关键词: 工业化, CLF-1钢, 低活化铁素体/马氏体钢, 力学性能