2026 Semiatin Haynes 282 High Temperature Plastic Flow

The interaction of plastic flow and microstructure evolution during continuous heating of superalloy Haynes 282 sheet was quantified using constant-stress, constant-heating-rate tests coupled with simulations of precipitation and dissolution. Prior to deformation, sheet samples were supersolvus solution treated and furnace cooled or oil quenched, producing a microstructure with equiaxed c grains and variations of c¢ precipitates. The tests included stresses from 121 to 414 MPa and heating rates of 75 or 28 °C/min. Results showed that the plastic flow was characterized by an increasing strain rate with temperature. The Arrhenius plots resulted in nearly-linear or bi-linear behaviors; slopes increased below and decreased above the nominal equilibrium c¢ solvus. Additionally, the influence of dislocation-precipitate interactions on plastic flow was analyzed through simulation results and threshold stress estimations, highlighting that dislocation climb over c¢ precipitates constrained plastic flow. These findings provide critical insights into the mechanical behavior of Haynes 282 under high-temperature conditions.