Microstructure and mechanical properties of IN 718 alloy by near-isothermal forging

摘要: Near-isothermal forging were carried out on IN 718 alloy to study the effect of parameters, i. e. temperature, deformation and strain rate, on microstructure and mechanical properties. Mechanical properties were affected by the deformation temperature since the grain coarsening with increasing temperature. And it should be pointed that the mechanical property was significantly effected by the shape and volume of interstitial phase. Acerose phase with suitable in volume was contributed to optimal property. Growth up of the interstitial phase was related to dislocation density and temperature. Under full-precipitation condition, acerose phase grew up to short-stick-shape. But under non-full-precipitation condition, acerose phase only precipitated at the final stage of the deformation and reserved acerose shape.