Influence of minor boron on the microstructures of a second generation Nibasedsingle crystal superalloy |
| |
Authors: | Yunsong Zhao Chenguang Liu Yuanyuan Guo Yanfei Liu Jian Zhang Yushi Luo Dingzhong Tang |
| |
Affiliation: | Science and Technology on Advanced High Temperature Structural Materials Laboratory, Beijing Institute of Aeronautical Materials, Beijing 100095, China |
| |
Abstract: | Boron is added into single crystal superalloys as a micro-alloying element to strengthen low angle grain boundaries. However, systematic investigations on the effect of boron on microstructures of single crystal superalloys are limitedly reported. The effect of boron on as-cast and heat-treated microstructures was investigated in two experimental Ni-based single crystal superalloys containing 3?wt% Re. The current results indicated that the volume fraction of (γ?+?γ′) eutectic and M3B2 borides was evidently increased, while the number of micropores was evidently decreased with the addition of 0.02?wt% boron. The (γ?+?γ′) eutectic could not be dissolved completely due to the lower incipient melting temperature caused by the formation of M3B2 borides. Meanwhile, the M3B2 borides were found to be enriched with indispensable strengthening elements Cr, Mo, W and Re, and this may lower the strengthening effect and cause stress concentration during high temperature creep. |
| |
Keywords: | Minor boron Single crystal superalloys Creep properties |
本文献已被 CNKI ScienceDirect 等数据库收录! |
| 点击此处可从《自然科学进展(英文版)》浏览原始摘要信息 |
|
点击此处可从《自然科学进展(英文版)》下载全文 |