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结合金相显微镜,利用腐蚀法研究高碳铬轴承钢GCr15高温扩散前后的带状组织演化。利用扫描电镜能谱仪分析带状偏析中主要合金元素的分布。结果表明,经高温扩散后,带状偏析与周围基体的耐蚀性差别减小,纵向截面趋于均匀腐蚀。高温扩散前,带状中Cr的分布为尖锐的突变型偏析峰,线扫描范围内成分分布波动频率低,偏析较明显。经高温扩散后,Cr的偏析峰减弱并较为平缓,成分分布波动频率显著增加,实际偏析程度降低。这可能与高温扩散促进元素的再分配有关,基体成分均匀性的提高也降低了腐蚀动力学过程。
Combined with optical microscope, the evolution of ribbon structure before and after high temperature diffusion of high carbon chromium bearing steel GCr15 was studied by corrosion method. Analysis of the distribution of alloying elements in banded segregation by scanning electron microscopy (EDS). The results show that after high temperature diffusion, the difference of corrosion resistance between strip segregation and the surrounding matrix decreases, and the longitudinal section tends to be uniform. Prior to the high temperature diffusion, the distribution of Cr in the ribbons is a sharp mutant segregation peak, and the component distribution in the line scan has a low frequency of fluctuation and segregation is more obvious. After high temperature diffusion, the segregation peak of Cr decreases and is gentle, the frequency of component distribution increases significantly, and the degree of actual segregation decreases. This may be related to the high temperature diffusion to promote the redistribution of the elements, and the improvement of the homogeneity of the matrix also reduces the corrosion kinetics.