Microstructural stability of long-term aged wrought Ni-Fe-based superalloys
Microstructural stability of long-term aged wrought Ni-Fe-based superalloys
复制标题
长期时效变形镍铁基高温合金的微观结构稳定性
DOI：
10.1080/02670836.2017.1282668
复制
发表时间：
2017
影响因子：
1.8
通讯作者：
Gu Yuefeng
中科院分区：
文献类型：
--
作者：
Zhao Xinbao;Dang Yingying;Yin Hongfei;Yuan Yong;Lu Jintao;Yang Zhen;Yan Jingbo;Gu Yuefeng
研究了长期热暴露对新型超超临界燃煤电厂用Ni-Fe基高温合金显微组织和显微硬度的影响。随着时效时间的延长，球形γ′相逐渐粗化，γ′相体积分数逐渐降低。在750°C时效时，随时效时间延长，M23 C6碳化物数量增加，宽度粗化速率与LSW模型一致。合金的显微硬度在935 h时效后基本保持不变，随后略有下降。发现从强耦合位错模型到Orowan模型的转变依赖于γ′的尺寸和体积分数。
The influence of long-term thermal exposure on the microstructure and microhardness of a new Ni–Fe-based superalloy, for advanced ultra-supercritical coal-fired power plants, was studied. Sphericalγ′ particles were coarsened with the increase of aging time, while the volume fraction ofγ′ was decreased. The amount of M23C6carbides was increased with aging time at 750°C, and the coarsening rate of the width of M23C6was consistent with that of the LSW model. The microhardness of the alloy was maintained following 935 h of aging time and then was slightly decreased. It was found that the transition from the strongly coupled dislocations model to the Orowan model was dependent on the size and volume fraction ofγ′.