EFFECTS OF Al ON COHERENT γ′, LATTICE MISFIT OF γ′/γ AND STRESS-RUPTURE PROPERTY OF NIMONIC 80A

摘要：

　　Effects of Al on microstructures and stress-rupture property of Nimonic 80A had been investigated.The γ′ presents a coherent orientation relationship with γ on 100γ′/γ and 110γ′/γ.Al increases the fraction of γ′ and lattice misfit of γ′/γ,but the fraction and lattice misfit decrease after stress-rupture tests compare with that after full heat treatment for each alloy,which is primarily due to increased width of γ matrix channel and probably lower thermal expansion coefficient of γ′,respectively.The significant increase of stress-rupture life is mainly due to the increased fraction of γ′ and the strengthening can be explained by Orowan looping mechanism.Increased lattice misfit may partly contribute to the growth of stress-rupture life.Precipitate of discrete Cr23C6 benefits stress-rupture properties,however,continuous grain boundary Cr23C6 can provide easy paths for crack propagation.

关键词： Nickel-based superalloy Microstructure Lattice misfit Stress-rupture property

作者: Yulai Xu Yulai Xu Qinghuan Liu Jun Li Xueshan Xiao Xiuli Cao Guoqing Jia

作者单位: Laboratory for Microstructures,Institute of Materials,Shanghai University 149 Yanchang Rd.Shanghai,2 Shanghai Electric Power Generation Equipment Co.,Ltd.,Turbine Works 333 Jiangchuan Rd.Shanghai,20024 Baoshan Iron & Steel Co.,Ltd.1298 Shuichan Rd.Shanghai,200940,China

会议类型: 国际会议

会议名称: Energy Materials 2014(第一届能源材料国际会议)

会议地点: 西安

会议语种:英文

页码: 417-423

在线出版日期: 2014-11-04（万方平台首次上网日期，不代表论文的发表时间）