Effect of Solution and Aging Heat Treatment on the Microstructure and Mechanical Properties of Inconel 625 Deposited Metal

• Published in: Crystals (Basel) 2024-09, Vol.14 (9), p.764
• Main Authors: Wang, Yingdi, Su, Yunhai, Dai, Zhiyong
• Format: Article
• Language: English
• Subjects: Aging; Aging (metallurgy); Alloys; Arc deposition; Carbides; Coal; Deformation analysis; Deformation mechanisms; Electric generators; Energy conservation; Energy consumption; Gas metal arc welding; Gas turbine engines; Heat resistant alloys; Heat treating; heat treatment; High temperature; Inconel 625; Mechanical properties; Microstructure; Nickel; Nickel alloys; Nickel base alloys; Research methodology; Solid solutions; Solution heat treatment; Stacking faults; Stainless steel; Strain analysis; strengthening mechanism; Stress-strain curves; Superalloys; Temperature; Tensile strength; Wire; Yield stress
• ISSN: 2073-4352; 2073-4352
• DOI: 10.3390/cryst14090764

Inconel 625 deposited metal was prepared by gas metal arc welding. The solid solution treatment temperature was set at 1140 °C for 4 h using the DSC test method, followed by secondary aging at 750 °C/4 h and 650 °C/24 h. The specimens in the prepared state and after heat treatment were subjected to high temperature tensile at 600 °C, respectively. The fracture morphology, thermal deformation behavior, and strengthening mechanism of the samples in different states were analyzed. The results showed that the stress–strain curves of the deposited metals exhibited obvious work-hardening behavior at 600 °C. The solid solution and aging heat-treated samples have higher tensile and yield strength, but the plasticity is obviously lower than that of the deposited metal. It was also found that the γ″ phase and M23C6 carbides, as well as the continuous stacking faults in the alloy, were the main reasons for the increase in tensile strength of the solution and aging heat-treated sample.