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铁冷轧形变以及热处理对形变缺陷的影响
Effect of Deformation and Heat-treatment on Deformation-induced Defects in Iron
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摘要: 采用常用冷轧设备对铁进行冷轧引入形变缺陷.研究形变量和温度对形变缺陷的影响.形变样品中的微观缺陷、物相结构和形貌分别使用正电子湮没技术(PAT)、X射线衍射仪(XRD)和透射电子显微镜(TEM)进行表征分析.对经过673K热处理的形变样品前后进行XRD测试,结果显示,随着形变量的增加,样品中晶面方向(200)具有择优生长趋势,673 K热处理后,择优趋势更加明显,同时晶粒的尺寸也增大.利用正电子湮没寿命谱和多普勒展宽能谱对样品中形变缺陷的热力学稳定性进行研究,发现形变引入的空位型缺陷约在673K回复完毕,723 K后位错缺陷开始回复.Abstract: The pure iron was cold rolled with the thickness reduction from 0％ to 75％.The microstructure defects,crystallographic structure and morphology of deformed specimens were characterized by positron annihilation technique (PAT),X-ray diffraction (XRD) and transmission electron microscopy (TEM).The XRD results show that the intensity of (200) increased with increasing deformation,673 K heat-treatment promote the preference of (200) and the grain size of (200) was increased.The PAT results show that the vacancy type defect was annihilated at 673 K and the dislocation type defects start to annihilate at 723 K.
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