Size effect of local single-crystal-layered ultrathin nickel-based superalloy GH4145 strip
Size effect of local single-crystal-layered ultrathin nickel-based superalloy GH4145 strip
复制标题
局部单晶层状超薄镍基高温合金GH4145带材的尺寸效应
DOI：
10.1016/j.msea.2022.144171
复制
发表时间：
2022-10
期刊：
影响因子：
6.4
通讯作者：
Zhaodong Wang
中科院分区：
文献类型：
--
作者：
Shaoxia Yu;Qingyuan Wang;Xiangtao Deng;Zhaodong Wang
通过控制冷轧和后续退火工艺，可以获得在带材厚度方向上晶粒层很少甚至只有单晶层的奥氏体镍基高温合金，由于尺寸效应，其力学性能和变形机制不同于宏观多晶层状材料。在这项研究中，镍基高温合金GH4145的厚度为0.2毫米作为原材料。通过控制冷轧和退火工艺，成功制备出厚度分别为70 μm和100 μm的局部单晶和多层晶薄带。研究了退火对不同晶粒层厚的双相薄带组织演变、变形机制和室温力学性能的影响。当退火温度高于1000 °C时，γ′-Ni 3（Al，Ti）相溶解，组织中的主要析出相由低温退火时的γ′和碳化物转变为只有碳化物。晶界钉扎效应减弱和二次再结晶导致的异常粗晶在板厚方向上形成了局部单晶粒层。此外，由于晶界减少和自由表面的比例增加，延伸率随退火温度的升高而异常降低被称为尺寸效应，其严重影响带材的机械性能。结果表明，部分变形组织和大量细小的再结晶晶粒的双相薄带具有较好的综合力学性能。·制备了70 μm和100 μm厚的局部单晶条带。γ′-Ni 3（Al，Ti）相的溶解削弱了对晶界的钉扎作用，导致晶粒异常粗大。·具有细小的再结晶和变形晶粒的热轧带钢具有较好的综合力学性能。
Austenitic nickel-based superalloys with very few grain layers or even a single-crystal layer in the thickness direction of the ultrathin strips can be achieved by controlling the cold rolling and subsequent annealing process, which leads to mechanical properties and deformation mechanisms that differ from those of macroscopic polycrystalline layered materials as a result of the size effect. In this study, nickel-based superalloy GH4145 with the thickness of 0.2 mm was used as the raw material. By controlling the cold rolling and annealing process, local single-crystal and multi-layer-crystal ultrathin strips with the thicknesses of 70 μm and 100 μm were successfully prepared. The effects of annealing on the microstructural evolution of the ultrathin strips with different grain layers on the deformation mechanism and room-temperature mechanical properties were studied. At annealing temperatures above 1000 °C, the γ′-Ni 3 (Al, Ti) phase dissolved, and the main precipitates in the microstructure changed from γ′ and carbide at low-temperature annealing to only carbide. The weakened pinning effect on the grain-boundary effect and abnormal coarse grains owing to secondary recrystallization generated a local single-grain layer in the thickness direction of the strips. Furthermore, because the grain boundary decreases and the proportion of free surface increases, the abnormal decrease in elongation with increasing annealing temperature is called the size effect, which critically influences the mechanical properties of the strips. The ultrathin strips, which have a partially deformed microstructure and a large number of fine recrystallized grains, show better comprehensive mechanical performance. • 70 μm and 100 μm thick local single-crystal ultrathin strips were prepared. • Weakened pinning effect on grain-boundary owing to the dissolution of γ′-Ni 3 (Al, Ti) phase resulted in abnormal coarse grains. • The ultrathin strips contained fine recrystallized and deformed grains had better comprehensive mechanical properties.
登录
查看更多内容
DOI：
10.2139/ssrn.3998837
发表时间：
2022-04
期刊：
SSRN Electronic Journal
影响因子：
--
作者：
Yongchao Gai;Rui Zhang;Jinxia Yang;C. Cui;J. Qu
通讯作者：
Yongchao Gai;Rui Zhang;Jinxia Yang;C. Cui;J. Qu
δ 相对室温镍基高温合金疲劳裂纹扩展行为的作用
DOI：
10.1016/j.msea.2016.12.029
发表时间：
2017-01
期刊：
Materials Science and Engineering A
影响因子：
--
作者：
Jinlan An;Lei Wang;Yang Liu;Wenliang Cai;Xiu Song
通讯作者：
Xiu Song
DOI：
10.1016/j.msea.2016.09.114
发表时间：
2017-01-02
影响因子：
6.4
作者：
Anderson, M.;Thielin, A. -L.;Savoie, J.
通讯作者：
Savoie, J.
影响因子：
6
作者：
Yunfei Xu;K. Du;C. Cui;H. Ye
通讯作者：
Yunfei Xu;K. Du;C. Cui;H. Ye
DOI：
10.7449/2005/superalloys_2005_135_154
发表时间：
2005
期刊：
Superalloys
影响因子：
--
作者：
G. D. Smith;S. Patel
通讯作者：
G. D. Smith;S. Patel