Effect of Drawing Rate on Microstructure and Segregation of Directionally Solidified Nickel-based Superalloy
Author of the article:MEI Zihan;QIANG Junfeng;YU Zhuhuan;LIU Beilei;FEI Zhenbao
Author's Workplace：School of Materials Science and Engineering,Xi'an University of Science and Technology,Xi'an 710054,China
Key Words：directional solidification drawing rate superalloy microstructure segregation
Abstract：The effect of drawing rate on microstructure and segregation of a directionally solidified nickel-based superalloy was studied.The results show that with the increase of the drawing rate,the solid-liquid interface changes from the flat boundary to the cellular,then to the coarse dendritic and finally to the fine dendritic.The spacing between primary and secondary dendrites is getting smaller and smaller,and theγ′phase morphology is becoming more and more regular cube,and the size ofγ′is getting smaller and smaller.The degree of element segregation first increases and then decreases,and reaches the peak at 100μm/s.The eutectic and carbide sizes decrease with the increase of the drawing rate,and the volume fraction of carbide and eutectic integrals increase with the increase of the drawing rate.
