Influence of Phosphorus on Deformation Mechanism and Mechanical Properties of IN718 Alloy

摘要

Phosphorus greatly increased the rupture life, remarkably decreased the creep rate, and reduced the impact energy of the IN718 alloy with an as-heat treated microstructure. However, it did not influence the tensile properties either at room temperature and 650°C. Phosphorus increased the yield strength of the IN718 alloy with a microstructure free from γ' phase, and it decreased the creep rate by strengthening the γ matrix. Dislocation mechanism operated at the deformation of rolling, and impact and tension test. Twinning mechanism operated at the creep of the IN718 alloy. Creep twinning was a thermal activated process.