摘要
采用X射线荧光光谱分析(XRF)、扫描电镜(SEM)和能谱分析(EDS)等方法,对真空自耗电弧熔炼的TB6铸锭的凝固组织和Fe偏析行为进行分析和研究。结果表明,铸锭柱状晶区Fe含量较均匀,等轴晶区晶粒尺寸范围在(5~10)mm×(5~10)mm,Fe元素含量在1.8wt%~2.5wt%,更易发生偏析。测得TB6中Fe偏析系数为0.38,其枝晶偏析现象明显,枝晶干中心含量较低,二次分枝含量较高,枝晶间富集Fe含量最高达到2.85wt%。Fe元素在铸锭中具有显著的径向负梯度,中心含量高,边缘含量低。熔炼前期电流大,熔池深,以及比重偏析现象,导致Fe元素纵向分布为底部高,头部低。
The solidification structure and Fe segregation behavior of TB6 ingot by vacuum arc melting were studied by X-ray fluorescence spectroscopy(XRF),scanning electron microscopy(SEM)and energy dispersive spectroscopy(EDS).The results show that the Fe content in the columnar grain zone is uniform,while in the equiaxed grain zone the content of Fe is in the range of 1.8wt%-2.5wt%,which is more prone to segregation,and the grain size of equiaxed zone is(5-10)mm×(5-10)mm.Fe segregation coefficient of TB6 is 0.38,the dendrite segregation phenomenon is obvious,the content of dendrite center is low,the content of secondary branches is high,and the content of Fe enriched between the dendrites is up to 2.85wt%.The Fe element has a significant negative radial gradient in the ingot,with high content in the center and low content at the edge.The vertical distribution of Fe element is high at the bottom and low at the head due to high current,deep molten pool and specific gravity segregation in the early smelting stage.
作者
王建磊
沙爱学
郝孟一
颜孟奇
肖明昊
WANG Jianlei;SHA Aixue;HAO Mengyi;YAN Mengqi;XIAO Minghao(Beijing Institute of Aeronautical Materials,Aero Engine Corporation of China,Beijing 100095,China)
出处
《热加工工艺》
北大核心
2025年第2期109-112,119,共5页
Hot Working Technology
基金
中国航发自主创新专项项目(CXPT-2020-032)。
