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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.
In this paper, the fracture life and deformation behavior of GH 698 alloy with two grain sizes under the fatigue-creep interaction at 700 ℃ are studied.The results show that the fracture life under fatigue-creep stress interaction can be divided into F, FC and C 3 In the FC and C zones, the existence of alternating stresses significantly hinders the creep and deformation process and improves the fracture life.After the fine-grained treatment, this impeding effect is strengthened and the improvement of the fracture life is increased. In the case of large-stress fatigue District fine grain processing, but to reduce the life of the alloy.