Microstructural evolutions and fracture behaviors of a newly developed nickel-base superalloy during creep deformation
Microstructural evolutions and fracture behaviors of a newly developed nickel-base superalloy during creep deformation
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新开发的镍基高温合金蠕变变形过程中的显微组织演变和断裂行为
DOI：
10.1016/j.jallcom.2018.02.295
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发表时间：
2018-05
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
研究了新设计的镍基高温合金M951 G在应力120-760 MPa、温度700 °C ~ 1000 °C范围内的蠕变行为，建立了试验条件-组织演变和断裂特征-蠕变性能之间的对应关系。结果表明，显微组织的演变和断裂特征取决于测试温度和施加的应力。根据X射线衍射（XRD）检验，在700-800 °C和高温低应力下的蠕变变形对所获得的图案没有任何显著影响。高温变形时，合金的（220）γ和γ′晶面显著突出，这可能提高了合金的蠕变强度，使合金具有更好的塑性。此外，还广泛讨论了析出相尺寸变化及其对蠕变性能的影响。在相同试验温度下，M951 G合金的蠕变寿命随外加应力的增加而降低，并对此进行了详细的分析。利用光学显微镜（OM）和扫描电子显微镜（SEM）观察了M951 G合金的断裂行为，随着蠕变条件的变化，其断裂行为由穿晶和沿晶混合型向纯沿晶断裂转变。700 °C和1000 °C下的表观应力指数分别约为11.5和6.4，其差异是由于变形机制、断裂模式和显微组织退化的变化造成的。
The creep behaviors of the newly designed nickel-base superalloy M951G have been studied over a stress range of 120–760 MPa and a temperature range of 700 °C–1000 °C, and the corresponding relationship among testing conditions-microstructural evolutions and fracture characteristics-creep properties has been established. Results show that both the microstructural evolutions and fracture characteristics are dependent on testing temperatures and applied stresses. According to X-ray diffraction (XRD) examinations, creep deformations at 700–800 °C and high temperatures low stresses have not any distinctive effect on the acquired patterns. However, deformations at high temperatures relatively higher stresses have significantly highlighted the (220)γ&γ′planes, which may enhance the creep strength and lead to a better plasticity for M951G alloy. Furthermore, precipitate dimensional changes and their effects on creep properties also have been widely discussed. At the same testing temperature, creep life of M951G alloy decreases with applied stress increasing, which has been analyzed in detail. Fracture behaviors of M951G alloy are observed by using optical microscope (OM) and scanning electron microscope (SEM), which change from a mixed type of transgranular and intergranular to pure intergranular cracking with the variation of creep conditions. The values of apparent stress exponents at 700 °C and 1000 °C are calculated to be about 11.5 and 6.4 respectively, the difference of which is due to the changes of the deformation mechanisms, fracture modes and the degeneration of microstructures.
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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
显微组织对新型镍钴基高温合金蠕变性能的影响
DOI：
10.1016/j.msea.2016.09.060
发表时间：
2016-12
期刊：
Materials Science and Engineering: A
影响因子：
--
作者：
L. Xu;C.Q. Sun;C.Y. Cui;C. Zhang
通讯作者：
C. Zhang
低膨胀GH909高温合金的本构行为和加工图
DOI：
10.1007/s12613-017-1424-3
发表时间：
2017-04
影响因子：
4.8
作者：
Yao Zhi-hao;Wu Shao-cong;Dong Jian-xin;Yu Qiu-ying;Zhang Mai-cang;Han Guang-wei
通讯作者：
Han Guang-wei
DOI：
10.4028/www.scientific.net/msf.788.466
发表时间：
2014-04
期刊：
Materials Science Forum
影响因子：
--
作者：
S. Liang;S. Tian;Z. Guo;Y. Xue;De-long Shu
通讯作者：
S. Liang;S. Tian;Z. Guo;Y. Xue;De-long Shu
堆垛层错能对镍基高温合金蠕变行为的影响
影响因子：
8.4
作者：
Tian, Chenggang;Han, Guoming;Sun, Xiaofeng
通讯作者：
Sun, Xiaofeng