采用Auger谱仪、二次离子质谱仪(SIMS)对Fe-C-Si-Mn合金(475℃等温处理)原始奥氏体晶界C,Si,Mn元素偏聚进行了研究。根据C,Mn正偏聚,Si负偏聚的实验结果,对晶界碳偏聚偏克分子自由能及活度进行热力学计算,结果表明Si,Mn元素促进碳在晶界的偏聚,并降低了它在晶界上的活度。从而使Fe-C-Si-Mn合金上贝氏体等温C曲线右移的现象得到解释。
Studies were made of the positive segregation of C and Mn as wellas negative one of Si along the original austenite boundary in 475℃ isothermalFe-C-Si-Mn alloy by means of Auger spectroscopy and SIMS. According to thethermodynamical calculation of partial molar free energy and activity of grainboundary segregation, it was indicated that the Si and Mn may promote the segrega-tion of C along grain boundary and depress its activity. Thus, the shift of theupper bainite TTT diagram to right may be easily explained.
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