摘要
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 well
as negative one of Si along the original austenite boundary in 475℃ isothermal
Fe-C-Si-Mn alloy by means of Auger spectroscopy and SIMS. According to the
thermodynamical calculation of partial molar free energy and activity of grain
boundary 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 the
upper bainite TTT diagram to right may be easily explained.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
1991年第3期B161-B165,共5页
Acta Metallurgica Sinica
基金
国家自然科学基金
