【摘要】：研究了Ce含量對鑄造態(tài)Fe-6.5%Si(質(zhì)量分?jǐn)?shù))合金顯微組織、有序結(jié)構(gòu)和中溫拉伸性能的影響,分析了Ce微合金化改善合金塑性的機(jī)理。結(jié)果表明,Ce含量在150×10~(-6)以下時,合金鑄造組織無明顯變化;Ce含量在210×10~(-6)以上時,鑄造組織明顯細(xì)化。Ce的添加可大幅度降低合金的有序程度,顯著改善中溫拉伸塑性;當(dāng)Ce含量為62×10~(-6)、150×10~(-6)和210×10~(-6)時,400℃拉伸試樣的平均斷后伸長率由無Ce試樣的7.4%分別升高至10.1%、19.3%和23.0%;而Ce含量增加至260×10~(-6)和790×10~(-6)時,Ce在晶界明顯富集導(dǎo)致試樣拉伸斷口呈現(xiàn)沿晶脆斷特征,平均斷后伸長率下降至15.5%和14.2%。有效改善Fe-6.5%Si合金塑性的合適Ce含量范圍為(150~210)×10~(-6)。
[Abstract]:The effect of Ce content on the microstructure, ordered structure and tensile properties of cast Fe-6.5%Si alloy was studied. The mechanism of Ce microalloying to improve the plasticity of the alloy was analyzed. The results show that when the Ce content is below 150 脳 10 ~ (-6), the cast microstructure of the alloy does not change obviously. When the content of Ce is above 210 脳 10 ~ (-6), the casting microstructure is obviously refined. The addition of Ce can greatly reduce the order degree of the alloy and improve the tensile plasticity of the alloy at moderate temperature. When the Ce content is 62 脳 10 ~ (-6), 150 脳 10 ~ (-6) and 210 脳 10 ~ (-6), the average post-break elongation of the tensile specimens at 400 鈩，

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