EFFECT OF Al ON MICROSTRUCTURE AND PROPERTIES OF In718 ALLOY

摘要：

Compared with the conventional In718 alloy, the addition of Al at the level of 1.24％ and 1.50％ greatly increases the precipitation of γ phase and the compact form of γ/γ/γ structure, which has been demonstrated in previous studies. The δ phase precipitation at the grain boundaries is noticeably suppressed. Large amount of Laves phase ((Fe, Ni, Cr)2(Nb, Mo)), small amount of M7C3 carbide and σ phase ((Fe, Ni)(Cr, Mo, Nb)) are precipitated at the grain boundaries. After aging at 680℃, the grain boundary precipitates are increased significantly. Large amount needle-like σ phase is precipitated at the grain boundary in the alloy with 1.50％ Al. After aging at 680℃ for 1000h, the grain boundary precipitates are worsened further, but the coarsening of the compact form γ/γ/γ is lighter than the γ phase in the normal In718 alloy.The tensile strength at room temperature and 680℃ are increased due to Al increasing. While the tensile ductility and impact toughness of the alloy decrease significantly, and a sharp decrease has been found during the long term aging at 680℃.The mechanism by which Al influencing the microstructure and mechanical properties of In718 alloy is to be discussed.

关键词： In718 alloy aluminum microstructure properties

作者: LIU FANG YANG SHULIN SUN WENRU GUO SHOUREN HU ZHUANGQI

作者单位: Institute of Metal Research, Chinese Academy of Sciences, No.72, Wenhua Road, Shenhe District, Shenyang City, Liaoning Province, P.R.China

会议类型: 国际会议

会议名称: 第五届先进材料与加工国际会议(Fifth International Conference on Advanced Materials and Processing ICAMP-5)

会议地点: 哈尔滨

会议语种:英文

页码: 1066-1073

在线出版日期: 2008-09-03（万方平台首次上网日期，不代表论文的发表时间）