摘要
利用重力和离心铸造方法,在金属型中浇注了目标成分为Ti-48Al-2Cr-2Nb(原子分数,%)的TiAl基合金,随后对其进行热等静压(HIP)处理(1270℃/173MPa/4h),研究了合金中各元素的分布均匀性。结果表明,熔炼过程中Al元素将产生一定的挥发,使得重力和离心浇注的TiAl基合金中Al元素含量均低于目标成分,离心力场对成分均匀性无明显影响。各种元素沿铸件横截面径向分布基本上是均匀的,微观区域内的成分波动可通过HIP工艺得到显著的改善。
The Ti-48Al-2Cr-2Nb （atomic fraction,%） samples were cast in metal mold in gravitational field and centrifugal field respectively and the hot isostatic pressing （HIP） treatment was done at 1 270℃（2/173MPa/4h. The distribution of elements in TiAl-based alloy samples was investigated. The results show that the content orAl is lower than the target component in two casting methools due to the volatilization of Al during melting process, the centrifugal field has slight effect on uniformity of composition. In addition, all elements show uniform distribution along radial direction in the sample and the uniformity in micro extent can be improved obviously by HIP process.
出处
《热加工工艺》
CSCD
北大核心
2007年第5期25-27,共3页
Hot Working Technology
基金
山东理工大学科研基金资助项目(4040-304019)
