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| EFFECT OF GRAIN BOUNDARY PRECIPITATES ON IMPACT TOUGHNESS AND NOTCH SENSITIVITY OF Fe-Ni-BASE SUPERALLOY GH135 |
| by GUO Jianting;ZHANG Jinyan;HUANG Rongfang;CHEN Guiyun Institute of Metal Research; Academia Sinica; Shenyang |
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Cite this article:
by GUO Jianting;ZHANG Jinyan;HUANG Rongfang;CHEN Guiyun Institute of Metal Research; Academia Sinica; Shenyang. EFFECT OF GRAIN BOUNDARY PRECIPITATES ON IMPACT TOUGHNESS AND NOTCH SENSITIVITY OF Fe-Ni-BASE SUPERALLOY GH135. Acta Metall Sin, 1985, 21(6): 1-106.
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Abstract The intermediate heat treatment under different temperatures was adopted tomodify the type, shape and amount of the grain boundary precipitate phases. Theimpact toughness of the alloy after intermediate heat treatmeni was evaluated atroom temperature and -196℃. Observations under SEM and TEM were carriedout on the impact fracture and its extraction replica. Resutlts showed that thesecondary TiC densely precipitates along grain boundary as thin flakes whichare exactly like a thin brittle coating over grain, but on the other hand, thegrain boundary TiC precipitates in less amount, and the notch sensitivity forstress rupture is found in the alloy. When the TiC or Laves-phase precipitatedas coarser and thicker flakes or as granules along grain boundary, the alloy hasno notch sensitivity. However, when the grain boundary TiC precipitated lessor distributed as granule, the alloy is improved over its impact toughness andthe impact fracture is transgranular. When the TiC or Laves-phase as-flakes dis-tributed along grain boundary, the impact toughness of the alloy is worsened andthe impact fracture is intergranular.
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Received: 18 June 1985
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