工程科学学报，第39卷，第2期：222-231,2017年2月 Chinese Journal of Engineering,Vol.39,No.2:222-231,February 2017 DOI:10.13374/j.issn2095-9389.2017.02.009;http://journals.ustb.edu.cn Mn元素对过流冷却过共晶Al-22Si-2Fe-xMn合金显 微组织及耐磨性的影响 王秋平13)，李璐123)，周荣锋123)四，蒋业华13)，周荣) 1)昆明理工大学材料科学与工程学院，昆明6500932)昆明理工大学分析测试研究中心，昆明650093 3)金属先进凝固成形及装备技术国家地方联合工程实验室，昆明650093 ☒通信作者，E-mail:zhourfchina@hotmail.com 摘要采用常规铸造和分段式倾斜板过流冷却铸造工艺制备A-22Si-2F-xMn合金，研究表明：过流冷却制备工艺能够改 善初生Si形貌及尺寸，但对针状富F相作用有限.利用扫描电镜，X射线衍射及透射电镜等手段分析过流冷却条件下M元 素添加对富Fe相晶体结构的影响，通过摩擦磨损实验研究不同M/Fe质量比的过共晶A-Si合金的硬度及耐磨损性能.结 果表明：随着过流冷却铸造过共晶Al-Si合金中M/Fe质量比增加，合金中四方结构的长针状富Fe相逐渐减少直至基本消 失，当Mn/Fe质量比为0.7时，富Fe相主要为六方结构的块状或鱼骨状a-Als(Fe,Mn),Si2相，此时，合金耐磨性较未添加 M如元素时有所提升，磨损机制以磨料磨损方式为主 关键词铝硅铁合金；过流冷却；过共晶合金；显微组织；耐磨性 分类号TG27 Effect of Mn element on the microstructure and wear resistance of hypereutectic Al-22Si-2Fe-xMn alloys produced by inclined cooling WANG Qiu-ping,LI L),ZHOU Rong-feng,JIANG Ye-hua,ZHOU Rong 1)School of Materials Science and Engineering,Kunming University of Seience and Technology,Kunming 650093.China 2)Research Center for Analysis and Measurement,Kunming University of Science and Technology,Kunming 650093.China 3)National Local Joint Engineering Laboratory of Advanced Metal Solidification Forming and Equipment Technology,Kunming 650093,China Corresponding author,E-mail:zhourfchina@hotmail.com ABSTRACT Al-22Si-2Fe-xMn alloys were prepared by conventional casting and a segment-based inclined cooling plates.It is shown that inclined cooling preparation technology can improve the morphology and size of primary Si,but has limited effect on the needle-shaped Fe-rich phase.The effect of Mn addition on the crystal structure of Fe-rich phase under the condition of inclined cooling was analyzed by scanning electron microscopy (SEM),X-ray diffraction (XRD)and transmission electron microscopy (TEM).The hardness and wear resistance of hypereutectic Al-Si alloys with different Mn/Fe mass ratios were also researched by friction and wear test.Results indicate that long needle-shaped Fe-rich phase of tetragonal structure decreases gradually and disappears basically in al- loys as the Mn/Fe mass ratio increases by inclined cooling casting hypereutectic Al-Si alloys.When the Mn/Fe mass ratio is 0.7,Fe- rich phase is mainly hexagonal structure block-shaped or fishbone-shaped a-Als(Fe,Mn)3Si phase.By the time,the wear resist- ance is enhanced compared with no Mn element addition.The wear mechanism gives priority to abrasive wear manner. KEY WORDS aluminum silicon iron alloys;inclined cooling;hypereutectic alloys;microstructure;wear resistance 收稿日期：2016-04-18 基金项目：国家自然科学基金资助项目(51505205,51261011)：昆明理工大学自然科学研究基金资助项目(20159X9):云南省教育厅科学研 究基金资助项目(2015Y058):昆明理工大学学生课外学术科技创新基金资助项目(2015YB011)工程科学学报,第 39 卷,第 2 期:222鄄鄄231,2017 年 2 月 Chinese Journal of Engineering, Vol. 39, No. 2: 222鄄鄄231, February 2017 DOI: 10. 13374 / j. issn2095鄄鄄9389. 2017. 02. 009; http: / / journals. ustb. edu. cn Mn 元素对过流冷却过共晶 Al鄄鄄22Si鄄鄄2Fe鄄鄄 xMn 合金显 微组织及耐磨性的影响 王秋平1,3) , 李 璐1,2,3) , 周荣锋1,2,3) 苣 , 蒋业华1,3) , 周 荣3) 1) 昆明理工大学材料科学与工程学院, 昆明 650093 2) 昆明理工大学分析测试研究中心, 昆明 650093 3) 金属先进凝固成形及装备技术国家地方联合工程实验室, 昆明 650093 苣 通信作者, E鄄mail: zhourfchina@ hotmail. com 收稿日期: 2016鄄鄄04鄄鄄18 基金项目: 国家自然科学基金资助项目(51505205, 51261011);昆明理工大学自然科学研究基金资助项目(20159X9);云南省教育厅科学研 究基金资助项目(2015Y058);昆明理工大学学生课外学术科技创新基金资助项目(2015YB011) 摘 要 采用常规铸造和分段式倾斜板过流冷却铸造工艺制备 Al鄄鄄22Si鄄鄄2Fe鄄鄄xMn 合金,研究表明:过流冷却制备工艺能够改 善初生 Si 形貌及尺寸,但对针状富 Fe 相作用有限. 利用扫描电镜、X 射线衍射及透射电镜等手段分析过流冷却条件下 Mn 元 素添加对富 Fe 相晶体结构的影响,通过摩擦磨损实验研究不同 Mn / Fe 质量比的过共晶 Al鄄鄄 Si 合金的硬度及耐磨损性能. 结 果表明:随着过流冷却铸造过共晶 Al鄄鄄 Si 合金中 Mn / Fe 质量比增加,合金中四方结构的长针状富 Fe 相逐渐减少直至基本消 失,当 Mn / Fe 质量比为 0郾 7 时,富 Fe 相主要为六方结构的块状或鱼骨状 琢鄄Al 15 (Fe,Mn)3 Si 2 相,此时,合金耐磨性较未添加 Mn 元素时有所提升,磨损机制以磨料磨损方式为主. 关键词 铝硅铁合金; 过流冷却; 过共晶合金; 显微组织; 耐磨性 分类号 TG27 Effect of Mn element on the microstructure and wear resistance of hypereutectic Al鄄鄄22Si鄄鄄2Fe鄄鄄 xMn alloys produced by inclined cooling WANG Qiu鄄ping 1,3) , LI Lu 1,2,3) , ZHOU Rong鄄feng 1,2,3) 苣 , JIANG Ye鄄hua 1,3) , ZHOU Rong 3) 1) School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China 2) Research Center for Analysis and Measurement, Kunming University of Science and Technology, Kunming 650093, China 3) National & Local Joint Engineering Laboratory of Advanced Metal Solidification Forming and Equipment Technology, Kunming 650093, China 苣 Corresponding author, E鄄mail:zhourfchina@ hotmail. com ABSTRACT Al鄄鄄22Si鄄鄄2Fe鄄鄄 xMn alloys were prepared by conventional casting and a segment鄄based inclined cooling plates. It is shown that inclined cooling preparation technology can improve the morphology and size of primary Si, but has limited effect on the needle鄄shaped Fe鄄rich phase. The effect of Mn addition on the crystal structure of Fe鄄rich phase under the condition of inclined cooling was analyzed by scanning electron microscopy (SEM), X鄄ray diffraction (XRD) and transmission electron microscopy (TEM). The hardness and wear resistance of hypereutectic Al鄄鄄Si alloys with different Mn / Fe mass ratios were also researched by friction and wear test. Results indicate that long needle鄄shaped Fe鄄rich phase of tetragonal structure decreases gradually and disappears basically in al鄄 loys as the Mn / Fe mass ratio increases by inclined cooling casting hypereutectic Al鄄鄄Si alloys. When the Mn / Fe mass ratio is 0郾 7, Fe鄄 rich phase is mainly hexagonal structure block鄄shaped or fishbone鄄shaped 琢鄄Al 15 (Fe, Mn)3 Si 2 phase. By the time, the wear resist鄄 ance is enhanced compared with no Mn element addition. The wear mechanism gives priority to abrasive wear manner. KEY WORDS aluminum silicon iron alloys; inclined cooling; hypereutectic alloys; microstructure; wear resistance