微量Si、C对铸造TiAl合金定向层片组织与持久性能的影响  

Effect of Trace Silicon and Carbon Additions on Directional Lamellar Microstructure and Rupture Properties of Cast TiAl Alloys

作　　者：张熹雯[1] 李海昭[1] 朱春雷[1] 骆晨[1] 赵明汉[1] 

机构地区：[1]钢铁研究总院,北京100081

出　　处：《铸造》2013年第9期881-884,共4页Foundry

摘　　要：在Ti-47.5Al-3.7(Cr,V,Zr)(at.%,以下均同)合金中添加0.2at.%Si、0.1at.%C以研究微量Si、C对铸造形成的定向层片组织及持久性能的影响。组织观察发现,添加微量的Si、C可生成富Si和富C的析出相,但不改变层片组织的取向特征。微量的Si、C通过增加定向层片组织的稳定性显著提高了其持久寿命,其中C的加入对持久寿命的提高幅度更大,还使持久断后伸长率有所减小。Based on Ti-47.5Al-3.7 （Cr,V,Zr） （at.％） alloy by adding 0.2at％ silicon and 0.1at％ carbon,the effects of trace silicon and carbon on the directional lamellar microstructure and creep rupture properties have been studied.According to examination on microstructures,trace silicon and carbon added in cast Ti-47.5Al-3.7 （Cr,V,Zr） alloys led to forming silicon-rich and carbon-rich precipitates respectively,meanwhile,the orientation characteristics of directional lamellar microstructure which could be formed in the original alloy were not altered.It revealed that the stability of the directional lamellar microstructure was enhanced by the addition of either 0.2at％ silicon or 0.1at％ carbon,and the creep rupture life of the alloy was remarkably promoted as a result,furthermore,the addition of carbon had more beneficial effect than the addition of silicon on extending the rupture life and reducing the total creep strain of the alloy.

关 键 词：铸造TIAL合金 定向层片组织 微合金化 持久性能 

分 类 号：TG292[金属学及工艺—铸造]