Mn和Ce对Fe-Ni-Mn-C-Si-Ce系合金组织和性能的影响

来源期刊:中国有色金属学报2007年第6期

论文作者:卢铃 朱定一 汪才良

文章页码:909 - 909

关键词:Fe-Ni-Mn-C-Si-Ce合金;高锰奥氏体;MnCe;加工硬化; 摩擦;磨损;

Key words:Fe-Ni-Mn-C-Si-Ce alloy; high manganese austenite; Mn; Ce; work-hardening; friction; wear

摘    要:采用熔炼法制备出新型高耐磨的Fe-20Ni-xMn-3.5C-2.5Si系固体自润滑材料,研究稀土元素Ce对Fe-20Ni-xMn-3.5C-2.5Si系合金中石墨的球化作用及Mn含量对力学性能及摩擦磨损性能的影响。结果表明:随着Mn含量的增加,合金凝固组织中奥氏体的硬度逐渐增大,特别是Fe-20Ni-xMn-3.5C-2.5Si-0.75Ce系合金在摩擦过程中的表面硬度大幅度提高,呈现出高锰钢特有的表面加工硬化性质,通过TEM可以观察到磨损表面生成孪晶型马氏体;添加0.75%(质量分数)的稀土Ce可以使结晶的石墨球化,使抗拉强度和抗弯强度大幅度提高,大约比未经球化处理的提高3~5.8倍;稀土Ce的加入可以促进Fe1.1Mn3.9C2型碳化物的生成,使材料的耐磨性进一步提高,其中Fe-20Ni-16Mn-3.5C-2.5Si-0.75Ce合金的磨损率最低,大约是QT500球墨铸铁的1/13。

Abstract: Fe-20Ni-xMn-3.5C-2.5Si solid self-lubricating materials with property of high-wearing were prepared by melting method. The spheroidization effect of rare earth Ce on graphite and the effect of Mn addition on mechanical properties and tribological performances of Fe-20Ni-xMn-3.5C-2.5Si alloys were studied. The results show that the austenite hardness of solidifying structures increases as the manganese content increases. The surface hardness of Fe-20Ni-xMn-3.5C-2.5Si-0.75Ce alloy increases widely after being worn and it appears the work-hardening of surface as like the high manganese-containing steel. The type of compound twin martensite on surface can be observed by TEM. The spheroidization effect of 0.75%(in mass fraction)of rare earth cerium on the graphite during crystallization is effective. The spheroidized alloy has higher tensile strength and flexural strength which is about 3-5.8 times higher than those of the non-spheroidized alloy. With the addition of rare earth Ce, the second phase Fe1.1Mn3.9C2, which makes the wear resisting property further increase, appears in matrix. Fe-20Ni-12Mn-3.5C-2.5Si -0.75Ce alloy has the lowest wear rate which is about 13 times lower than that of the spheroidal cast iron.

基金信息:国家自然科学基金资助项目

有色金属在线官网  |   会议  |   在线投稿  |   购买纸书  |   科技图书馆

中南大学出版社 技术支持 版权声明   电话:0731-88830515 88830516   传真:0731-88710482   Email:administrator@cnnmol.com

互联网出版许可证:(署)网出证(京)字第342号   京ICP备17050991号-6      京公网安备11010802042557号