The formation of G phase and in-service embrittlement of the centrifugally cast 20Cr32Ni1Nb alloy
A series of tensile tests, Charpy impact tests, Optical microscopy (OM) observations, and scanning electron microscopy (SEM) examinations were carried out to investigate the in-service embrittlement of 20Cr32NilNb alloy.The XRD pattern of the extracted powder of the as-cast specimen shows that the main precipitates are eutectic niobium carbides (NbC) and chromium carbides (M23C6).In the Ex-service samples, besides the precipitates of NbC and M23C6 carbides, the Ni-Nb silicide known as G phase (Ni16Nb6SiT) is formed as a sequence of the instability of NbC at elevated temperature, which may result in the embrittlement of service-exposed 20Cr32NilNb alloy.Based on the X-ray diffraction data, time-temperature-transformation curve of G phase was obtained in the aged 20Cr32Ni 1 Nb alloy.
Cast alloy embrittlement G phase
Xiaofeng Guo Jianming Gong Luyang Geng Jianqun Tang Yong Jiang Yingying Ni Xiankai Jia Xinyu Yang
School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing, Jiangsu 211816, China
国际会议
长沙
英文
121-127
2016-10-16（万方平台首次上网日期，不代表论文的发表时间）