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:小角度晶界对合金仲长率有显著影响;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.
参考文献
| [1] | POLLOCK T M;MURPHY W H;GOLDMAN E H.Grain defect formation during directional solidification of nickel base single crystals[A].Warrendale,PA:TMS,1992:125-134. |
| [2] | KONTER M;KATS E;HOFMANN N.A novel casting process for single crystal gas turbine components[A].Warrendale,PA:TMS,2000:189-200. |
| [3] | Donald J. Siegel;J.C. Hamilton .Computational study of carbon segregation and diffusion within a nickel grain boundary[J].Acta materialia,2005(1):87-96. |
| [4] | 葛庭燧;冯端.金属物理学[M].北京:科学出版社,1999 |
| [5] | Bruckner U.;Link T.;Dressel K.;Epishin A. .The influence of the dendritic structure on the gamma/gamma '-lattice misfit in the single-crystal nickel-base super-alloy CMSX-4[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,1998(1/2):23-31. |
| [6] | L. R. Liu;T. Jin;N. R. Zhao .Microstructural evolution of a single crystal nickel-base superalloy during thermal exposure[J].Materials Letters,2003(29):4540-4546. |
| [7] | Q. Z. Chen;Y. H. Kong;C. N. Jones;D. M. Knowles .Porosity reduction by minor additions in RR2086 superalloy[J].Scripta materialia,2004(2):155-160. |
| [8] | GOLDSCHMIDT D;PAUL U;SAHM.Porosity clusters and re-crystalliaztion in single-crystal components[A].Warrendale,PA:TMS,1992:155-164. |
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