通过表面机械研磨处理(SMAT)在低活化铁索体钢的表面形成了一层纳米晶.TEM和XRD结果显示,SMAT后的表层组织为纳米晶.550℃的回火实验结果显示,SMAT后的纳米晶具有良好的热稳定性；回火120 min后的晶粒异常长大,回火240 min后的晶粒比较均匀(约250 nm).SMAT后试样表层碳化物的衍射峰变宽变弱,表明SMAT过程中碳化物被细化,HRTEM观察显示SMAT后的表层组织中存在细小的MC类型碳化物；根据XRD结果,计算了M23C6和MC碳化物的晶格常数分别为1.0631和0.4306 nm.由于测试机理和测量深度不同以及纳米组织的尺寸随着深度变化,利用XRD和TEM检测的晶粒尺寸不同,而TEM照片能更准确地反应晶粒的实际尺寸.
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