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Precipitation and coarsening behavior of ����� phase in CoNi-base superalloy under different aging treatments

Journal Article


Abstract


  • In order to investigate the influence of aging regimes on the coarsening behavior of ����� precipitates in CoNi-base superalloy, single and double aging treatments were performed, respectively. For the superalloy after experiencing single aging treatment, the typical ��/����� microstructure with coherent ����� embedded in the matrix is obtained and the coarsening kinetics of ����� precipitates is in accordance with the Lifshitz-Slyozov-Wagner (LSW) theory. The corresponding coarsening rate increases owing to the addition of ����� forming elements (Ti and Ni) and the calculated activation energy suggests that coarsening kinetics of ����� is controlled by diffusion of Ni and Ti in the matrix for the investigated CoNi-base superalloy. Whereas for the superalloy after experiencing the double aging treatment, bimodal size distributions of ����� precipitates are recognized and a decelerated coarsening of secondary ����� precipitates in coarsening zone is found as compared with the one after experiencing the single aging treatment, which could be attributed to the effect of primary ����� precipitates.

Publication Date


  • 2020

Published In


Citation


  • Guan, Y., Liu, Y., Ma, Z., Li, H., & Yu, H. (2020). Precipitation and coarsening behavior of ����� phase in CoNi-base superalloy under different aging treatments. Vacuum, 175. doi:10.1016/j.vacuum.2020.109247

Scopus Eid


  • 2-s2.0-85079156905

Volume


  • 175

Issue


Place Of Publication


Abstract


  • In order to investigate the influence of aging regimes on the coarsening behavior of ����� precipitates in CoNi-base superalloy, single and double aging treatments were performed, respectively. For the superalloy after experiencing single aging treatment, the typical ��/����� microstructure with coherent ����� embedded in the matrix is obtained and the coarsening kinetics of ����� precipitates is in accordance with the Lifshitz-Slyozov-Wagner (LSW) theory. The corresponding coarsening rate increases owing to the addition of ����� forming elements (Ti and Ni) and the calculated activation energy suggests that coarsening kinetics of ����� is controlled by diffusion of Ni and Ti in the matrix for the investigated CoNi-base superalloy. Whereas for the superalloy after experiencing the double aging treatment, bimodal size distributions of ����� precipitates are recognized and a decelerated coarsening of secondary ����� precipitates in coarsening zone is found as compared with the one after experiencing the single aging treatment, which could be attributed to the effect of primary ����� precipitates.

Publication Date


  • 2020

Published In


Citation


  • Guan, Y., Liu, Y., Ma, Z., Li, H., & Yu, H. (2020). Precipitation and coarsening behavior of ����� phase in CoNi-base superalloy under different aging treatments. Vacuum, 175. doi:10.1016/j.vacuum.2020.109247

Scopus Eid


  • 2-s2.0-85079156905

Volume


  • 175

Issue


Place Of Publication