Thermo-mechanical fatigue damage behavior for Ni-based superalloy under axial-torsional loading
Thermo-mechanical fatigue damage behavior for Ni-based superalloy under axial-torsional loading
复制标题
轴向扭转载荷下镍基高温合金的热机械疲劳损伤行为
DOI：
10.1016/j.msea.2018.02.029
复制
发表时间：
2018-03
期刊：
影响因子：
6.4
通讯作者：
Li Zhi-Gao
中科院分区：
文献类型：
--
作者：
Li Dao-Hang;Shang De-Guang;Zhang Cheng-Cheng;Liu Xiao-Dong;Li Fang-Dai;Li Zhi-Gao
对镍基高温合金GH4169在360~650 °C温度范围内的轴向扭转热机械疲劳行为进行了实验研究。结果表明，在相同的von Mise等效机械应变幅值条件下，轴向机械应变与温度同相时会严重降低疲劳寿命，机械应变的非比例加载会导致疲劳寿命进一步降低。分析结果表明，疲劳寿命取决于疲劳、蠕变和氧化损伤的总和。在机械非比例载荷作用下，位错与析出相之间的相互作用会引起附加硬化，从而显著增加疲劳损伤。拉伸平均应力和非比例附加硬化会进一步增加所有加载条件下存在的氧化损伤，从而导致高温下非弹性应变的增加。在高拉应力和高温同时作用下，晶界表现出蠕变损伤行为，且随剪切力的增加而增加。此外，与高温剪切应力相比，拉伸应力对蠕变空洞的形核有明显的影响，非比例附加硬化可导致更大的蠕变损伤。
The axial-torsional thermo-mechanical fatigue behavior for Ni-based superalloy GH4169 was investigated experimentally in the temperature interval from 360 °C to 650 °C. The experimental results showed that, in the same von Mises equivalent mechanical strain amplitude condition, the fatigue life can be seriously decreased when the axial mechanical strain and the temperature are in-phase, and the non-proportional loading of mechanical strains can result in the fatigue life to further decrease. The analysis results showed that the fatigue lives depend on the summation of fatigue, creep and oxidation damages. The interaction between dislocations and precipitations can induce the additional hardening under mechanical non-proportional loading, which can obviously increase the fatigue damage. The tensile mean stress and the non-proportional additional hardening can further increase the oxidation damage existed in all loading conditions, which result in the increase of inelastic strain at high temperature. Creep damage behavior on grain boundaries can be shown in the case of the high tensile stress and the high temperature acting simultaneously, and increased with shear stress at the same time. In addition, the tensile stress has an obvious effect on the nucleation of creep cavities contrasted to the shear stress at high temperature, and more creep damage can be caused by the non-proportional additional hardening.
登录
查看更多内容
多轴高周载荷下基于最大剪应力面的权函数法确定临界面
影响因子：
6
作者：
Wang Xiao-Wei;Shang De-Guang
通讯作者：
Shang De-Guang
DOI：
10.1520/stp16218s
发表时间：
1995-05
期刊：
ASTM special technical publications
影响因子：
--
作者：
S. Kalluri;P. Bonacuse
通讯作者：
S. Kalluri;P. Bonacuse
DOI：
10.1007/s11661-014-2653-y
发表时间：
2015-02
期刊：
Metallurgical and Materials Transactions A
影响因子：
--
作者：
G. V. Prasad Reddy;A. Nagesha;R. Sandhya;S. Sankaran;M. D. Mathew;K. Bhanu Sankara Rao
通讯作者：
G. V. Prasad Reddy;A. Nagesha;R. Sandhya;S. Sankaran;M. D. Mathew;K. Bhanu Sankara Rao
影响因子：
6
作者：
F. Vöse;M. Becker;Andreas Fischersworring-Bunk-;H. Hackenberg
通讯作者：
F. Vöse;M. Becker;Andreas Fischersworring-Bunk-;H. Hackenberg
DOI：
10.1115/1.4031908
发表时间：
2015-06
影响因子：
1.5
作者：
Xijia Wu;Zhong-ping Zhang
通讯作者：
Xijia Wu;Zhong-ping Zhang