Abstract：The δ phase is a second phase in Inconel 718 nickel-based alloy. The shape, size and distribution of the δ phase have a great influence on the mechanical properties of the material. The tensile properties of Inconel 718 alloy bar were unqualified in the production process. The chemical composition, tensile fracture, microstructure and precipitated phase structure in qualified and unqualified batches of bar were analyzed. The results showed that the low finishing rolling temperature of the unqualified batch caused the precipitation of needle-like δ phases with a large number of continuous distributions at grain boundaries and within grains. Due to the relatively weak binding force between the second phase and the matrix, the strength of the material was reduced and the brittleness was increased. The strict control of rolling temperature could avoid the precipitation of needle-like δ phase and improve the tensile properties of the material.
李雪峰, 苏军锋, 刘岩, 杨晓, 王世宁, 陈洁明. Inconel 718合金δ相的析出及对力学性能的影响探究[J]. 物理测试, 2023, 41(3): 61-66.
LI Xuefeng, SU Junfeng, LIU Yan, YANG Xiao, WANG Shining, CHEN Jieming. Precipitation of δ phase in Inconel 718 alloy and its effect on mechanical properties. PHYSICS EXAMINATION AND TESTING, 2023, 41(3): 61-66.
XU Xiaoyan,MA Xiangdong,WANG Hong, et al. Characterization of residual stresses and microstructural features in an Inconel 718 forged compressor disc[J].Transactions of Nonferrous Metals Society of China,2019(29):569.
2023, Vol. 41 
