Effect of Recovery Heat Treatment on Microstructure and Properties of IN783 Bolts in Service

作者：Sun, Shibao; Tao, Siyou; Wang, Sailong; Wang, Jiaqing; Liu, Junjian; Wu, Yue; Du, Xiaodong^*

来源：JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE, 2023, 32(12): 5523-5534.

DOI：10.1007/s11665-022-07494-w

• beta phase
• gamma ' phase
• grain boundary strength
• high-temperature tensile property
• IN783
• Ni5Al3 phase

Various testing techniques established the association between precipitates and the mechanical characteristics of IN783 alloy at high temperatures. The results show that the beta phase is coarser at the grain boundary and that the Ni5Al3 phase precipitates inside the beta phase as service time increases, which destroys the structure of the beta phase, weakening the strength of the grain boundary and reducing the ductility of the alloy at high temperatures. Meanwhile, increasing the size of the gamma ' phase coarser from 53 to about 74 nm enhances the yield strength of the alloy. Following the recovery heat treatment, the grain boundary beta phase is precipitated again with a smaller size and no Ni5Al3, and the size of the gamma ' phase is refined to the unused level. The alloy material's high-temperature ductility is restored, which extends the material's service life.