Inhomogeneous strain and recrystallisation of a shot-peened Inconel 625 alloy after annealing
Inhomogeneous strain and recrystallisation of a shot-peened Inconel 625 alloy after annealing
复制标题
喷丸 Inconel 625 合金退火后的不均匀应变和再结晶
DOI：
10.1080/02670836.2019.1651475
复制
发表时间：
2019
影响因子：
1.8
通讯作者：
M. Ishiwata
中科院分区：
文献类型：
--
作者：
M. Kumagai;Kazuki Kimura;N. Shimada;M. Ishiwata
通过扫描电镜和电子背散射衍射分析，观察了喷丸镍高温合金等温退火后的显微组织变化。分析的基础是反向极图和核平均位错图。退火前，在表面下观察到一层严重的塑性变形层。退火1 h后，最上层30-40µm层发生不连续再结晶，下层仍存在不均匀应变。经过一段特定的时间后，非均匀菌株恢复，但没有再结晶。再结晶的阈值深度取决于非均匀应变。再结晶和生长从再结晶阈值深度向地表推进。这些微观组织的变化解释了喷丸强化残余应力的释放机制。
Microstructural variations in a shot-peened nickel superalloy after isothermal annealing were observed via scanning electron microscopy and electron backscatter diffraction analysis. The analysis was based on inverse pole figure and kernel average misorientation maps. Before annealing, a heavily plastically deformed layer was observed under the surface. Post annealing for 1 h, the uppermost 30–40 µm layer was discontinuously recrystallised and inhomogeneous strains remained in the below layers. After a particular duration, the inhomogeneous strains recovered but did not recrystallise. The threshold depth of recrystallisation depended on the inhomogeneous strains. Recrystallisation and growth progressed from the recrystallisation-threshold depth toward the surface. These microstructural variations explain the release mechanism of the residual stress induced by shot peening.