文献类型：期刊文献

英文题名：The effect of δ phase on the microplasticity evolution of a heat-treated nickel base superalloy

作者：Yuan, Guang-Jian[1];Chen, Hao[1];Li, Dong-Feng[2];Gong, Cong-Yang[1,3];Zhang, Xian-Cheng[1];Tu, Shan-Tung[1]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, Key Lab Pressure Syst & Safety, Minist Educ, Meilong Rd 130, Shanghai 200237, Peoples R China;[2]Harbin Inst Technol, Sch Sci, Shenzhen 518055, Peoples R China;[3]AECC Commercial Aircraft Engine Co Ltd, Shanghai Engn Res Ctr Commercial Aircraft Engine, Shanghai 201108, Peoples R China

年份：2020

卷号：148

外文期刊名：MECHANICS OF MATERIALS

收录：;EI(收录号：20202708903338);WOS:【SCI-EXPANDED(收录号:WOS:000556753500071)】；

基金：This work was supported financially by the National Key Research and Development Program of China (2018YFC1902404), the National Natural Science Foundation of China (Nos. 51725503, 51975214 and 51805501) and 111 Project. Zhang XC is also grateful for the Innovation Program of Shanghai Municipal Education Commission (2019-01-07-00-02-E00068). DL acknowledges the Shenzhen Municipal Science and Technology Innovation Council for the support under Grant JCYJ20160608161000821.

语种：英文

外文关键词：GH4169 superalloy; Crystal plasticity; Delta phase; Microstructure; Finite element modelling

摘要：The micromechanical deformation behaviour of the commercial Ni-base polycrystalline Ni-base superalloy GH4169 has been investigated in terms of the volume fraction and grain boundary distribution of the delta (Ni3Nb) phase. The main objective of this work was to gain an understanding about the mechanisms of deformation of the superalloy at the grain scale. To that purpose, experimental and microstructural observations are relied upon to construct realistic models of the polycrystalline superalloy microstructure using crystal plasticity concepts. It was found that a volume fraction of the grain boundary delta phase in excess of approximately 3.0% results in a weakening of the room temperature strength, and the detrimental effect increases with increasing the delta phase volume fraction. This study also revealed that the grain boundary delta phase, being stronger than the surrounding grains, impedes the transmission of plastic slip through the grain boundaries, thus enhancing the localisation of plastic slip within the grains. However, the strengthening effect associated with such slip blocking mechanism by the delta phase is considerably lower than the weakening of the deformation resistance of the grains due to the depletion of the meta-stable gamma '' precipitates within the grains resulting from the stable delta phase formation.