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.
出处
《铸造》
CAS
CSCD
北大核心
2013年第9期881-884,共4页
Foundry
关键词
铸造TIAL合金
定向层片组织
微合金化
持久性能
titanium aluminide alloy
directional lamellar microstructure
microalloying
creep rupture properties
