Effects of Annealing Process on the Microstructure and Properties of Haynes 282 Alloy Wire

The annealing process for wires used in high-temperature seals is a critical parameter in product design. This study investigated the effects of cold drawing reduction in area and annealing parameters on the strength， ductility， and microstructure of Haynes 282 alloy wire feedstock （0.9 mm diameter baseline seal wire） using optical microscopy， scanning electron microscopy， room-temperature tensile testing， and hardness measurements. A fitting analysis was conducted on the average grain size after annealing for different cold drawing reduction rates. The results indicate an inverse relationship between grain size and hardness after annealing under different parameters： as the annealing temperature increased or holding time extended， the grain size increased while hardness decreased. An increase in the reduction in area led to work hardening， demonstrating a linear relationship between the cold drawing reduction in area and tensile strength. When a fully fibrous microstructure form （at 69.14% reduction）， the tensile strength reach 1 805 MPa. The Haynes 282 alloy wire exhibits abnormal grain growth and a decline in properties after annealing within low area reduction ranges （10.80%-39.51%） and at an area reduction of 62.65%， due to non-uniform deformation. Based on comprehensive experimental results and fitting analysis， the optimal annealing parameters were determined to be 1 140 ℃ for 45 minutes. A cold drawing reduction in area between 45.60% and 55.56% prior to this annealing treatment was found to produce the final wire product with a stable microstructure and an optimal strength-ductility balance.