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| EFFECT OF STRESS AND TEMPERATURE ON EXTENT OF PRIMARY CREEP IN DIRECTIONALLY SOLIDIFIED Ni-BASE SUPERALLOYS |
| YAO Deliang;LIN Dongliang(T.L.Lin);SUN Chanqi Shanghai Jiaotong University |
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Cite this article:
YAO Deliang;LIN Dongliang(T.L.Lin);SUN Chanqi Shanghai Jiaotong University. EFFECT OF STRESS AND TEMPERATURE ON EXTENT OF PRIMARY CREEP IN DIRECTIONALLY SOLIDIFIED Ni-BASE SUPERALLOYS. Acta Metall Sin, 1985, 21(3): 45-53.
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Abstract The primary creep strain(PCS)of most directionally solidified Ni-base super-alloys at intermediate temperature of 700-800℃ and high stress of 490-784MN/m~2 is evidently higher than that of conventionally cast alloys.That is due tothe shearing of the γ′particles and the large gliding distance of dislocations.PCSin creases with increasing stress.The longitudinal PCS of DZ3 at intermediatetemperature is quite low and similar to that of the conventionally cast CCK3alloy.Directional solidification does not increase the longitudinal PCS of K3alloy at intermediate temperature and high stress.This is due to the creep mechan-ism of dislocation climbing over γ′particles.PCS increases slightly with increas-ing creep stress.The transverse PCS of the directionally solidified alloys is thesame of the corresponding conventionally cast alloys.The larger the γ/γ′latticemisfit and the higher the strength,the lower the longitudinal PCS of directionallysolidified alloys.At high temperature of 850-980℃ and low stress of 196-343MN/m~2,the PCS of DS Ni-base superalloys is similar to that of conventionallycast alloys and increases slightly with the increasing creep stress.
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Received: 18 March 1985
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