1 College of Mechanical & Electrical Engineering, Changsha University, Changsha 410022, Hunan, China; 2 Hunan Engineering Research Center of Research and Development of Degradable Materials and Molding Technology, Changsha University, Changsha 410022, Hunan, China; 3 Changsha Kaiple Technology Co., Ltd., Changsha 410114, Hunan, China; 4 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, Liaoning, China
Effect of stabilizing treatment on microstructure and stress rupture properties of phosphorus microalloyed Inconel 706 alloy
1 College of Mechanical & Electrical Engineering, Changsha University, Changsha 410022, Hunan, China; 2 Hunan Engineering Research Center of Research and Development of Degradable Materials and Molding Technology, Changsha University, Changsha 410022, Hunan, China; 3 Changsha Kaiple Technology Co., Ltd., Changsha 410114, Hunan, China; 4 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, Liaoning, China
摘要 The microstructure and stress rupture properties of Inconel 706 alloy microalloyed with phosphorus are examined under stabilizing and unstabilizing heat treatment conditions. It was found that applying the stabilizing treatment resulted in a 98% increment in the stress rupture life and a 215% increment in the elongation tested at 650 °C/690 MPa for the alloy compared to that under the unstabilizing heat treatment condition. The stabilizing treatment led to the precipitation of rodshaped and needle-shaped η phases at the grain boundaries. Morphologies of γ'–γ'' co-precipitates in the grain interior were noncompact form and compact form for the alloy under unstabilizing and stabilizing heat treatment conditions, respectively. Based on the microstructure characterizations, the improvement of stress rupture properties by the stabilizing treatment was attributed to the precipitation of η phases at the grain boundaries, which can hinder cracks initiation and propagation and relieve the stress concentration.
Abstract：The microstructure and stress rupture properties of Inconel 706 alloy microalloyed with phosphorus are examined under stabilizing and unstabilizing heat treatment conditions. It was found that applying the stabilizing treatment resulted in a 98% increment in the stress rupture life and a 215% increment in the elongation tested at 650 C/690 MPa for the alloy compared to that under the unstabilizing heat treatment condition. The stabilizing treatment led to the precipitation of rodshaped and needle-shaped g phases at the grain boundaries. Morphologies of c0–c00 co-precipitates in the grain interior were noncompact form and compact form for the alloy under unstabilizing and stabilizing heat treatment conditions, respectively. Based on the microstructure characterizations, the improvement of stress rupture properties by the stabilizing treatment was attributed to the precipitation of g phases at the grain boundaries, which can hinder cracks initiation and propagation and relieve the stress concentration.
Sha Zhang,Yu-chao Wu,Yu Li, et al. Effect of stabilizing treatment on microstructure and stress rupture properties of phosphorus microalloyed Inconel 706 alloy[J]. Journal of Iron and Steel Research International, 2023, 30(8): 1613-1621.
2023, Vol. 30 
