Defect Analysis of Large GH4169 Alloy Forged Bar

Author of the article:DONG Zhaowei1 , XU Kuikui1 , SUN Lihui1 , LIU Meng2 , WANG Yang3 , DONG Zhongqi3

Author's Workplace：1. School of Information Technology, Hebei University of Economics and Technology, Shijiazhuang 050061, China; 2. Avic Shangda Superalloys Co.,Ltd., Technology Center, Qinghe 054800, China; 3. Department of Material Engineering, Hebei Vocational and Technical University of Technology, Shijiazhuang 050000, China

Key Words：GH4169alloy; grain refinement; forging; heat treatment

Abstract：GH4169 alloy was prepared by vacuum induction, atmosphere protection-vacuum self-consumption “triple smelting technology”. After forging and standard heat treatment, the microstructure defects of GH4169 alloy bar were analyzed by scanning electron microscope (SEM) and X-ray diffraction (XRD), and the variation law of microstructure defects was statistically analyzed and simulated. The results show that the grain size of GH4169 alloy forgings is fine, including δ-phase, γ′-phase, γ苁-phase and MC carbide phase. The peak height of MC carbide phase decreases first and then increases from the core to the edge of the alloy. The distribution of small defects in the center of bar is dense, while the defects in the edge are sparse and the major defects are dominant. Near the outermost layer, the distribution of large defects is also very dense.