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Regarding Fe-Mn phase diagram,the vertical line towards left represents Fe with allotropic changes occurring room temperature (alpha)=>(gamma) at 912 deg C=> (delta) at 1400 deg C => melting a 1538 deg C. Similary,towards right Mn have at room temperature (alpha) =>(beta)at 707 deg C =>(gamma) at 1087 deg C =>(delta) at 1138 deg C =>Melting at 1246 deg C. At around 1498 deg C,peritectic reaction occurs L + (delta) => gamma(Fe,Mn) similar to Austinite in Fe-C phase diagram. More or less gamma(Fe,Mn) phase is dominants the phase diagram. Up to 4% Mn, alpha(Fe,Mn) (912 to 400)deg C, from 4 to 30% both alpha(Fe,Mn) and gamma(Fe,Mn) will be stable from (912 to 400)deg C. Peritectiod reaction occurs at 700 deg C changing

gamma(Fe,Mn) +beta(Fe,Mn) => alpha(Fe,Mn). Transformation temperature from beta(Fe,Mn) => alpha(Fe,Mn) roughly occurs around and along 707 deg C.

Regarding Fe-Mo phase diagram,there is lot of temperature differences between Molybdenum (2623) and Iron (1539) there are many peritectic reactions in the phase diagram. gamma(Fe,Mo) is reduced to a loop, as alpha(Fe,Mo) is enlarged as Molybdenum is B.C.C if ferrite stabilizer, while austenite (FCC) is shrunken to loop with the addition of Mo. A peritectic reaction at 1500 deg C, converting L + Sigma => R, A peritectiod reaction converting R + Sigma =>Mu. And Eutectiod reaction at 1200 deg C, converting R => alpha + Mu. Another peritectic reaction at 1611 deg C,converting L + alpha => sigma. At 900 deg C, Mu => lamda, below 900 deg C alpha + Mu => alpha + lamda,in between Mu and alpha + lambda we have

lambda + mu.

Example: Basic principle of phase diagram, intermediate phases(alpha + beta) will be alpha(towards left) and beta(towards right),this applies to any phases either solid or liquid and gases.

thanks & regards,

g.sudhakar

phd(material engineering)

hcu