Fe-Mn-Si合金热循环时γ-ε马氏体相变特征  

Characteristics of γ-ε Martensitic Transformation in Fe-Mn-Si Alloy during Thermal Cycles

作　　者：张建新[1] 

机构地区：[1]河北工业大学材料学院,天津300130

出　　处：《河北工业大学学报》2000年第4期70-72,共3页Journal of Hebei University of Technology

摘　　要：用 Ｘ射线衍射方法对 Ｆｅ－３１．６Ｍｎ－６．５Ｓｉ合金在 ８３－４８０Ｋ温度范围两次热循环时的热诱发γ－ε马氏体相变进行了研究．结果表明，冷却过程中γ→ε相变过程并非终止于ＴＮ，而是终止在更低的温度．冷却至８３ Ｋ时，γ相表现的还相当稳定．同样，ε马氏体在加热到４８０ Ｋ时也显示出较高的稳定性．在加热到大约２７５Ｋ时，观察到奥氏体（２００）衍射强度出现异常降低，而马氏体（１０１）衍射强度正常．这种异常现象可能与加热时奥氏体由反铁磁性向顺磁性的转变有关。The thermal-induced martensitic transformation in a Fe-31 .6Mn-6.5Si (wt. %) alloy was studied by means of X-ray diffraction through two thermal cycles in the 83-480K temperature range. It is shown that during cooling the transformation terminates not at TrN but at a lower temperature and the phase exhibits strong stability even cooling to 83K; likewise, martensite is noticeably stable even heating up to 480K. At the temperature about 275K, an anomalous decrease in the intensity of the (200) reflections was observed on heating, whereas the (101) reflections show a general variation in intensity. It is considered that the abnormal phenomenon is probably related to the magnetic transition of the phase from antiferromagnetism to paramagnetism.

关 键 词：马氏体相变 Ε马氏体 铁锰硅合金 热循环 

分 类 号：TG141[一般工业技术—材料科学与工程]