摘要
采用两个籽晶制备了第二代单晶高温合金DD6小角度晶界试样,在800,850,900,950℃的条件下,进行了拉伸实验研究。结果表明:小角度晶界对合金伸长率有显著影响;在850℃,小角度晶界试样具有最大的伸长率;高于850℃,随着温度的升高小角度晶界试样伸长率具有明显下降倾向。小角度晶界对合金抗拉强度的影响较小;除角度大于约9°的小角度晶界外,相同实验温度条件下小角度晶界试样的抗拉强度大致相当。随着温度的升高和晶界角度的增大,小角度晶界强度降低而成为相对较为薄弱部位,从而导致拉伸性能的降低。
At 800, 850, 900℃ and 950 ℃, effects of Low Angle grain Boundaries （LABs） on the tensile properties of the second generation single crystal superalloy DD6 were investigated, and the test specimens were prepared by using two seeds. LABs had more influence on the elongation of the alloy. At 850℃, the elongation of the alloy with LABs was the highest, and the decreasing tendency of elongation was obvious with temperature increasing at the temperature higher than 850℃. The effect of LABs on the strength was less, and the strengths were comparative with each other at the condition of the same temperature except the specimen with the misorientation higher than about 9°. Decrease in tensile property results from that the strength of LABs decreased with temperature or misorientation increasing so that the LABs became a weak link.
出处
《材料工程》
EI
CAS
CSCD
北大核心
2008年第8期73-76,共4页
Journal of Materials Engineering
关键词
单晶高温合金
DD6
小角度晶界
拉伸性能
single crystal superalloy
DD6
low angle grain boundary
tensile property
