Mn含量对Fe-xMn-9Al-8Ni-1C合金微观组织及氧化行为的影响  

Effect of Mn Content on Microstructures and Oxidation Behavior of FexMn-9Al-8Ni-1C Alloys

作　　者：雷娜青 白亚平[1] 成超 李建平[1] 杨忠[1] LEI Na-qing;BAI Ya-ping;CHENG Chao;LI Jian-ping;YANG Zhong(School of Materials and Chemical Engineering,Xi′an Technological University,Xi′an 710021,Shaanxi,China;Northwest Industrial Group Co.,Ltd.,Xi′an 710043,Shaanxi,China)

机构地区：[1]西安工业大学材料与化工学院,陕西西安710021 [2]西北工业集团有限公司,陕西西安710043

出　　处：《铸造》2022年第1期59-64,65,共7页Foundry

基　　金：陕西省自然科学基础研究计划(2021JM-429);陕西省教育厅青年创新团队建设科研计划项目(21JP051);国家自然科学基金青年基金项目(51705391)。

摘　　要：采用真空电弧熔炼的方法制备Fe-xMn-9Al-8Ni-1C合金(x=10,15,20,25,wt%),研究了该系列合金的物相、微观组织、力学性能及合金在600℃时的氧化行为。结果表明:该系列合金主要含有奥氏体相、NiAl化合物相和κ-碳化物相,随Mn含量的增加,奥氏体相逐渐增多,NiAl相逐渐减少;与此同时,合金的塑性提高,硬度值有所降低;当Mn含量为10%时,硬度值最大为HRC 40.7。氧化行为测试结果表明,随着Mn含量的增加,合金的抗氧化性增强,合金表面形成的氧化膜分为两层,外氧化层由Fe_(2)O_(3)和少量Mn_(2)O_(3)组成,内氧化层主要为Al_(2)O_(3)与Mn_(2)O_(3)。相较于Mn含量为10%时的合金,Mn含量为25%时,合金氧化性能大幅改善,其氧化增重减少了127.8%,氧化膜厚度降低了102.7%。Fe-xMn-9Al-8Ni-1C alloys(x=10,15,20,25 wt%)were prepared by vacuum arc melting.The phase,microstructures,mechanical properties and oxidation behavior of the alloys at 600℃were investigated.The results showed that the alloys mainly contained austenite phase,NiAl compound and k-carbide phase.With the increase of Mn content,the austenite phase increased and the NiAl phase decreased.Meanwhile,the plasticity of the alloys increased and the hardness decreased with the increase of the Mn content.When the Mn content was 10%,the maximum hardness value was HRC 40.7.The oxidation behavior test results showed that the oxidation resistance of the alloys increased with the increase of the Mn content.The oxide is divided into two layers,the outer layer is composed of Fe_(2)O_(3) and a small amount of Mn_(2)O_(3),and the inner layer is mainly Al_(2)O_(3) and Mn_(2)O_(3).Compared with the alloys with Mn content of 10%,the oxidation properties of the alloys with Mn content of 25%were greatly improved,the oxidation weight gain reduced by 127.8%,and the oxide film thickness reduced by 102.7%.

关 键 词：Fe-xMn-9Al-8Ni-1C合金 微观组织 硬度 抗氧化性能 

分 类 号：TG142.33[一般工业技术—材料科学与工程]