论文标题
高分辨率电子反向散射研究研究在微观结构尺度上Fe-C Martensite中四方失真的异质性研究
High resolution electron backscatter diffraction study on the heterogeneities of tetragonal distortion in Fe-C martensite at the microstructural scale
论文作者
论文摘要
Fe-0.77c（wt。％）合金中马氏四方（C/A比）的空间变化是通过电子反向散射衍射模式与高角度分辨率电子反向散射衍射分析相结合的。发现C/A比在Martensite块和块之间变化。除四方变形外，在晶界的附近，块内的C/A变化尤其明显。块之间的C/A变化比块内的变化更为明显。通过假设作用在A-和B轴上的合理残留应变，我们的方法很好地与来自同一材料的X射线衍射轮廓预测的晶格参数频率曲线与X射线衍射曲线匹配。晶体失真的异质性是由于马氏体转化序列以及异质残留应变而导致的固体碳和碳排序中的散射带来的。
The spatial variation in martensite tetragonality (c/a ratio) in Fe-0.77C (wt.%) alloy was investigated by means of pattern matching of electron backscatter diffraction patterns combined with high angular resolution electron backscatter diffraction analysis. It was found that the c/a ratio varies within a martensite block and between blocks. The c/a variation within a block is particularly evident in the vicinity of grain boundaries and shear strains are also present in addition to tetragonal distortion. The c/a variation between blocks is more apparent than that within a block. The lattice parameter frequency profile predicted by our approach well matches with the X-ray diffraction profile from the same material by assuming reasonable residual strain acting on a- and b-axes. The heterogeneities of the crystal distortion are brought by a decrease and scatter in solid solution carbon and in carbon ordering as a result of the martensite transformation sequence as well as heterogeneous residual strain.
