Investigation on the influence of precipitated phase on corrosion resistance of the Ni-based alloys
The influence of precipitated phases in Ni-based alloys during solid solution aging treatment on the performance of Ni-based alloys was investigated by means of metallographic observation,scanning electron microscope (SEM),and transmission electron microscope (TEM).The variation of microstructure and resultant phases as a result of solid solution aging treatment at different temperatures was discussed.The results show that the heat treatment temperature has significant influences on the type as well as quantity of precipitation phases.Lots of phases precipitated at grain boundaries,the distribution of precipitated phases are characterized by mesh-like structure.The corrosion tests results indicate that there is a potential difference between grains and grain boundaries due to the precipitation of chrome carbide at grain boundaries,resulting in pitting corrosion occurred preferentially at grain boundaries,consequently,the corrosion resistance of Ni-based alloys is reduced.In order to enhance the corrosion resistance of Ni-based alloys,it is expected to control the carbon content in a lower range and proper heat treatment process to avoid large amount precipitation of chrome carbide.
Ni-based corrosion-resistant alloy solution treatment precipitated phase intergranular grain boundary
Xuehui Zhao Zhenquan Bai Yaorong Feng Anqing Fu
Engineer, Tubular Goods Research Institute of CNPC,No.32 Dianzier Road, Xian Shaanxi710065, PR Chin Professor, Tubular Goods Research Institute of CNPC,No.32 Dianzier Road, Xian Shaanxi710065, PR Chi Doctor, Tubular Goods Research Institute of CNPC,No.32 Dianzier Road, Xian Shaanxi 710065,PR China
国际会议
香港
英文
1038-1043
2012-07-27（万方平台首次上网日期，不代表论文的发表时间）