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SCIE SCOPUS
니켈기 초내열 합금 KM 1557 의 저주기 피로 거동
Low Cycle Fatigue Behavior of Ni - Base Superalloy KM 1557
최성배(Seong Bae Choi), 권숙인(S . I . Kwun), 최주(Ju Choi)
UCI I410-ECN-0102-2008-580-001839702

The low cycle fatigue behaviors of Ni-base superalloy KM 1557 with two different microstructures were investigated. The fatigue properties can be rationalized in terms of the Coffin-Manson eqaution relating plastic strain with the number of cycles to failure. For a low total strain amplitude(1.0%) the fatigue life of the Ni-base superalloy with α-W and γ′ is substantially less than that of other condition. Microstrucural examination revealed that microcracks initiated at the interface between matrix and α-W. This was attributed to the twin formation around α-W. During low cycle fatigue, the Ni-base superalloy with only α-W precipitates gives rise to a short period cyclic hardening followed by softening. However, the Ni-base superalloy with not only α-W but also γ′ gives rise to cyclic softening. The cyclic softening behavior of the Ni-base superalloy KM 1557 with two different microstructures was related to the strain localization due to γ′ shearing and the interface between α-W and matrix. This study mainly concerned with the role of interface between α-W and matrix, and twin formation.

[자료제공 : 네이버학술정보]
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