Cyclic stress responses of a newly developed nickel-base superalloy at elevated temperatures
Cyclic stress responses of a newly developed nickel-base superalloy at elevated temperatures
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新开发的镍基高温合金在高温下的循环应力响应
DOI：
10.1016/j.jallcom.2018.09.267
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发表时间：
2019-01
影响因子：
6.2
通讯作者：
Sun Xiaofeng
中科院分区：
文献类型：
--
作者：
Cui Luqing;Yu Jinjiang;Liu Jinlai;Sun Xiaofeng
对新设计的镍基高温合金M951G在不同试验条件下进行了总应变控制低周疲劳试验，建立了循环应力响应、组织退化、变形机制与试验条件之间的关系。结果表明，循环硬化和软化行为均与试验温度和应变幅值有关。随着应变幅值的增加，M951G合金在低应变幅值下表现出循环硬化，在高应变幅值下表现出循环软化。在90 0和10 0 0 °C下，M951G合金表现出循环硬化。在90 0 °C时，初始循环硬化与共格γ/γ‘界面、平行位错阵列和绕过微小γ’粒子的位错有关。在较高应变幅值下，初始循环软化是由于γ析出相中较高的剪切位错密度所致。在1000 °C时，γ通道中存在大量的平行位错阵列，这降低了来自不同滑移系的位错相互作用的可能性，导致了初始的循环硬化。在较高应变幅值下，除了显微组织退化、位错向γ‘相的剪切和位错网络的形成外，γ’相的位错湮没和部分共格丧失也是导致1000 °C的初始循环软化的原因。
Total strain-controlled low cycle fatigue tests were conducted on the newly designed nickel-base superalloy M951G under different testing conditions; the relationship among cyclic stress responses, microstructural degradations, deformation mechanisms and testing conditions has been established. Results show that both the cyclic hardening and softening behaviors are dependent on the testing temperature and strain amplitude. As the strain amplitude increases both at 900 and 1000 °C, M951G alloy exhibits cyclic hardening under low strain amplitudes and cyclic softening under higher strain amplitudes. At 900 °C, the initial cyclic hardening is related to the coherent γ/γ′ interface, parallel dislocation arrays and dislocation bypassing the tiny γ′ particles. At higher strain amplitudes, the initial cyclic softening is due to the higher density of shearing dislocations in γ′ precipitates. At 1000 °C, plenty of parallel dislocation arrays present in γ channels, which reduces the possibility of dislocation interactions from different slip systems and results in initial cyclic hardening. Under higher strain amplitudes, apart from microstructural degradations, dislocations shearing into γ′ precipitates and formation of dislocation networks, the dislocation annihilation and partial loss of coherency of γ′ precipitates are also responsible for the initial cyclic softening at 1000 °C.
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DOI：
10.1016/0921-5093(88)90050-0
发表时间：
1988-05
影响因子：
6.4
作者：
M. Reger;L. Rémy
通讯作者：
M. Reger;L. Rémy
影响因子：
8.4
作者：
Liu Liu-Liu;J. Meng;Jinlai Liu;T. Jin;Xudong Sun;Hai-feng Zhang
通讯作者：
Liu Liu-Liu;J. Meng;Jinlai Liu;T. Jin;Xudong Sun;Hai-feng Zhang
影响因子：
1.8
作者：
M. Connolly;M. Whittaker;S. Williams
通讯作者：
M. Connolly;M. Whittaker;S. Williams
影响因子：
6
作者：
M. Nazmy;J. Denk;R. Baumann;A. Künzler
通讯作者：
M. Nazmy;J. Denk;R. Baumann;A. Künzler
镍基单晶高温合金不同温度低周疲劳变形机制
影响因子：
6
作者：
X. G. Wang;J. L. Liu;T. Jin;X. F. Sun;Y. Z. Zhou;Z. Q. Hu;C. Y. Jo
通讯作者：
C. Y. Jo