本論文研究鐵-29.3錳-4.0鋁-0.92碳合金(wt%)的相變化情形。合金於1100與775℃之間為單一的沃斯田體，而於750至600℃時，於沃斯田體晶粒內有M3C、M23C6及κ’型碳化物的析出。於600至500℃時，於沃斯田體晶粒內存有由M3C或是M23C6碳化物所組成的波來體組織。此波來體組織的共析溫度約在625至600℃之間，且其恆溫變態曲線的鼻部區溫度約於550℃附近。
比較不同組成相內所含的溶質原子量，其含錳量的高低依序為：M3C碳化物、M23C6碳化物、κ’型碳化物、沃斯田體相及肥粒體相。以含鋁量的高低依序為：肥粒體相、κ’型碳化物、沃斯田體相、M23C6碳化物及M3C碳化物，其中M3C碳化物幾乎不含有鋁，此點似乎是M3C碳化物的特性。於兩種波來體組織內，肥粒體晶粒內的溶質組成皆為高鋁、低錳及低碳。
本研究發現兩組M3C碳化物與鄰近沃斯田體基地間的方位關係：前者為[101]C//[ ]γ及( )C//(220)γ；而後者為[001]C//[ ]γ以及(210)C//( )γ。於M3C碳化物所組成的波來體組織，亦找到兩組M3C碳化物與肥粒體間的方位關係：第一組的方位關係為[001]C//[113]α及( )C//( )α；而第二組為[113]C//[111]α及( )C//( )α。另外，於M23C6碳化物與肥粒體所形成的波來體中也觀察到兩組方位關係：前者的方位關係為[ ]C6//[ ]α及(111)C6// (110)α；而後者為[ ]C6//[ ]α及( )C6//( )α。

This eassy is dedicated in the phase transformation of a Fe-29.3Mn- 4.0Al-0.92C(wt%) steel. At temperatures range from 1100 to 775℃, a single austenite phase presents in the steel; from 750 to 600℃, M3C, M23C6 and κ’ type carbides precipitate in the austenitic grains; and from 600 to 500℃, pearlites consisting of both M3C and M23C6 carbide layers with ferritic layers, independently, coexist in the austenitic grains. The eutectoid temperatures of the pearlites are between 625 and 600℃. Moreover, the nose of the TTT curves for the isothermal transformations of pearlites is near 550℃.
Comparing the solute concentrations in the constituent phases, we found the sequence of the Mn concentration from high to low is as follows: M3C, M23C6, κ’ type carbride, austenite and ferrite. The sequence of aluminum concentration is: ferrite, κ’ type carbride, austenite, M23C6 and M3C carbide. M3C carbide is almost free of aluminum. It seems to be a characteristic feature of M3C carbide. The ferritic grains in both different pearlites contain high Al, low C and Mn.
We found several orientation relationships between carbides and their neighboring grains. [101]C//[ ]γ, ( )C//(220)γ and [001]C//[ ]γ, (210)C//( )γ are orientation relationships between M3C carbide and austenite. [001]C//[113]α, ( )C//( )α and [113]C//[111]α, ( )C//( )α are between M3C carbide and ferrite. Finally, [ ]C6//[ ]α, (111)C6// (110)α and [ ]C6//[ ]α, ( )C6//( )α are orientation relationships between M23C6 carbide and ferrite.

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