Microstructure Evolution during Aging of Alloy 617B for 700 degrees C Ultra-Supercritical Boiler Pipe

作者：Jiang He^*; Dong Jianxin; Zhang Maicang; Yao Zhihao

来源：Rare Metal Materials and Engineering, 2016, 45(4): 981-988.

• ultra-supercritical
• aging
• microstructure stability

The microstructure stability and mechanical properties of alloy 617B after 720 degrees C/10 000 h, 800 degrees C/2000 h and 850 degrees C/100 h aging and short term aging at different temperatures were studied. The results show that the microstructure stability of alloy 617B after aging at 720 degrees C for 10,000 h is relatively poor, gamma' phase coarsens and harmful phase precipitates on grain boundary. Aging temperature has an impact on the microstructure stability of alloy 617B. gamma' phase coarsens rapidly with the increasing of aging temperature and the intragranular precipitates are transferred. The hardness of alloy 617B is mainly influenced by the precipitation rule of gamma' phase. There are zipper-like precipitates in grains during 720 degrees C aging while the structure of phase needs further study.

• 出版日期2016-4
• 单位北京科技大学