摘要
针对能够将初生γ-奥氏体保留到室温的Fe-15Mn-0.6C合金,采用扫描电镜(SEM)及其配备的能谱仪(EDS)和电子背散射衍射(EBSD)系统,对添加Ce的合金中的夹杂物进行形貌观察、成分分析和相鉴定,采用FactSage软件系统的Phase Diagram和Equilib模块对添加Ce的合金中的夹杂物行为进行热力学计算。结果表明,添加含Ce夹杂物的类型和数量影响取决于O,S,Ce的相对含量,在0.0006%O-0.0020%S-0.016%Ce和0.0006%O-0.0051%S-0.025%Ce条件下,合金中主要形成CeS夹杂,在0.0015%O-0.0045%S-0.025%Ce条件下,合金中主要形成Ce_(2)O_(2)S和CeS夹杂,夹杂物形状圆整,尺寸多数约1~2μm。热力学计算为添加Ce对Fe-15Mn-0.6C合金中夹杂物的影响提供了理论依据。研究结果能够为进一步搞清添加Ce细化初生γ-奥氏体的异质形核作用提供扎实的研究基础。
The morphologies and compositions of inclusions in Fe-15Mn-0.6C alloys with different Ce contents were studied by scanning electron microscopy(SEM)equipped with energy dispersive spectroscopy(EDS).The phase identification of the Ce-containing inclusions in Fe-15Mn-0.6C alloys with different Ce contents were examined using the electron backscattering diffraction(EBSD)combined with the EDS in the SEM.The Phase Diagram and Equilib modules of FactSage Software System were used to calculate the inclusions behavior in Fe-15Mn-0.6C alloys with different Ce contents.The results show that the type and the mass fraction of the Ce-containing inclusions in Fe-15Mn-0.6C alloys with different Ce contents are related to the relative contents of O,S and Ce in the alloys.CeS mainly forms in the condition of 0.0006%O-0.0020%S-0.016%Ce and 0.0006%O-0.0051%S-0.025%Ce,and CeS and Ce_(2)O_(2)S generate in the condition of 0.0015%O-0.0045%S-0.025%Ce.The Ce-containing inclusions are rounded in shape and about 1~2μm in size.The thermodynamic calculations explain the effects of Ce on the inclusions behavior in Fe-15Mn-0.6C alloys with different Ce contents theoretically.The findings can provide solid theoretical basis for further understanding the heterogeneous nucleation effect in the grain refinement of the primaryγ-austenite by Ce addition.
作者
辛浩浩
计云萍
周印
李一鸣
任慧平
Xin Haohao;Ji Yunping;Zhou Yin;Li Yiming;Ren Huiping(School of Material and Metallurgy(School of Rare Earth),Inner Mongolia University of Science and Technology,Baotou 014010,China;Inner Mongolia Autonomous Region Key Laboratory of Advanced Metal Materials,Baotou 014010,China;Collaborative Innovation Center of Integrated Exploitation of Bayan Obo Multi-Metal Resources,Inner Mongolia University of Science and Technology,Baotou 014010,China)
出处
《中国稀土学报》
EI
CAS
CSCD
北大核心
2023年第4期774-781,I0004,共9页
Journal of the Chinese Society of Rare Earths
基金
国家自然科学基金项目(51761034)资助。
