本文研究了两种晶粒度的GH 698合金在700℃疲劳蠕变交互作用下的断裂寿命和形变行为.结果表明:在疲劳蠕变应力交互作用下的断裂寿命可以分成F,FC和C三个区.在FC及C区,交变应力的存在明显地阻碍蠕变形变过程,提高了断裂寿命.细晶处理后使这种阻碍作用加强,断裂寿命提高幅度变大.在大应力的疲劳区进行细晶处理,反而使合金寿命降低.
The fatigue-creep interaction behaviour of superalloy GH698 with dif-ferent grian sizes has been studied at 700℃. The results show that three zones,F, C and FC, can be distinguished at the fatigue-creep interaction curves. In zonesFC and C, the presence of alternative stresses inhibits the creep deformation pro-cess, therefore delays the fracture of the alloy. This effect will be enhanced bygrain refining. However, in zone F, grain refining exhibits an inverse effect un-der large alternative stresses.
参考文献
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| [2] | 张济山,杨玉玥,陈国良,耿清全,黄麟基.金属学报,1988 |
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