Effect of Extrusion Parameters on Microstructure of Ni-based P/M Superalloy
Author of the article:SONG Xiaojun;WANG Chaoyuan;WANG Yu;ZHOU Lei;ZOU Jinwen
Author's Workplace：Key Laboratory of Advanced High Temperature Structural Materials,Beijing Institute of Aeronautical Materials,Beijing 100095,China
Key Words：Ni-based P/M superalloy extrusion temperature extrusion speed extrusion ratio recrystallization
Abstract：
The influence of extrusion parameters on microstructure of nickel-based powder metallurgy(P/M)superalloy was studied.The results show that when the extrusion speed is 20 mm/s and the extrusion ratio is 4:1,the dynamic recrystallization degree increase with the increase of extrusion temperature.When the extrusion speed exceed 1100℃,the grain size tend to grow.When the extrusion speed is 50 mm/s at 1100℃and the extrusion ratio is 3:1~8:1,the extrusion ratio is over 6:1,and the influence of deformation heat on grain growth is obvious.At 1100℃,the recrystallization grains become finer with the increase of extrusion speed at 20 mm/s and extrusion ratio of 4:1.When the extrusion speed reaches 80 mm/s,the deformation heat causes the recrystallization grain to grow.Along the extrusion direction,the head grain of the bar billet is thicker,while in the vertical extrusion direction,the edge grain of the bar billet is finer.
