摘要
对铸态和固溶态的DD6单晶高温合金进行强度为0．4MPa的15s和30s的表面吹砂，然后分别进行不同热处理，得到不同厚度的再结晶层，研究再结晶层厚度对DD6单晶合金持久性能的影响。结果表明：在1230℃以下均产生胞状再结晶、1280℃以上均产生等轴状再结晶。铸态吹砂，然后标准热处理获得40~60μm的等轴状再结晶层，固溶态吹砂并时效处理后获得15～25μm的胞状再结晶层，两种状态试样的再结晶层厚度均随着吹砂时间增加而增大。在三种持久条件下，合金的持久寿命均随再结晶层的增加而降低，即不吹砂试样〉固溶态吹砂15s〉固溶吹砂30s〉铸态吹砂15s〉铸态吹砂30s。
The as-cast and solid solution DD6 superalloy were treated by grit blasting at 0.4 MPa for 15 s and 30 s, then heat treating to obtain the different recrystallization layer. The effect ofrecrystallization layer thickness on the stress rupture properties was studied. The results show that below 1 230 ℃, cellular recrystallization can form on the surface; above 1 280 ℃, equiaxed recrystallization can form on the surface. With the grit blasting and then standard heat treating for as cast specimen, the equiaxed recrystallization can be obtained. With the grit blasting and then aging heat treating for the solid solution specimen, thinner cellular recrystallization can be obtained. The thickness of the recrystallization layer of the two kinds of samples all increases with the increase of the blasting time. Under the three tests conditions, the stress rupture lives decrease with the increase of the thickness ofrecrystallization layer, that is, standard sample solution blasting for 15 s〉 solution blasting for 30 s〉 as cast state blasting for 15 s〉 as cast state blasting for 30 s.
出处
《铸造》
CAS
CSCD
北大核心
2016年第8期779-782,786,共5页
Foundry
基金
辽宁省教育厅高等学校科学技术研究资助项目(L013057)
辽宁省自然科学基金(2014028014)
关键词
DD6单晶高温合金
等轴状再结晶
胞状再结晶
持久性能
DD6 single crystal superalloy
equiaxed recrystallization
cellular recrystallization
stressrupture properties
