深度轧制细化工业纯铁晶粒

REFINEMENT OF PURE IRON GRAIN BY SEVERE ROLLING TECHNIQUE

利用常用的轧制设备,采用热轧与冷轧及热处理相结合,提出了深度轧制工业纯铁和制备块体纳米晶工业纯铁的方法.经X射线衍射(XRD)分析,深度轧制后的样品在300℃回复7h,表层晶粒尺寸为38.9nm;透射电镜(TEM)分析表明,板材内部的晶粒尺寸为87.5nm.采用该方法可制备出大块、无孔隙缺陷的纳米晶工业纯铁,且晶粒的热稳定性较好.

Nanostructured bulk pure iron has been successfully prepared by severe hot rolling and cool rolling with the usual rolling equipment and heat treatments. The analysis of XRD shows that the grain size in surface layer of specimen after severe rolling and restored at 300degreesC for 7 h is about 38.9 nm. The analysis of transmission electron microscope (TEM) shows that the grain size in the middle of specimen is about 87.5 nm. The prepared bulk nanostructured pure iron has no hole-like defect and possesses better heat stability of grain size.