Effect of Aging Heat Treatment on the Microstructure and Creep Properties of the Cast Ni-Based Superalloy at Low Temperature
Effect of Aging Heat Treatment on the Microstructure and Creep Properties of the Cast Ni-Based Superalloy at Low Temperature
复制标题
时效热处理对铸造镍基高温合金低温组织和蠕变性能的影响
DOI：
10.1007/s40195-018-0827-0
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Lou Lang-Hong
中科院分区：
文献类型：
--
作者：
Li Xiang-Wei;Wang Li;Liu Xin-Gang;Wang Yao;Dong Jia-Sheng;Lou Lang-Hong
研究了时效热处理对铸造镍基高温合金晶界组织和蠕变性能的影响。随着时效温度从750℃提高到1000℃，M23C6碳化物沿晶界由细小分布的块状、连续的薄膜向粗大的离散块状演化。此外，在1000℃时效过程中，M23C6碳化物主要包裹在晶界的γ层内。时效温度越高，760℃和645℃下的蠕变持久寿命和延伸率越高。特别是1000℃时效样品的蠕变断裂寿命比750℃时效的样品高一个数量级。γ包络引起的延性提高对蠕变断裂寿命的提高起着重要作用。
Effect of aging heat treatment on the grain boundary microstructure and creep properties of a cast Ni-based superalloy was investigated. With increasing aging temperature from 750 to 1000 °C,M23C6carbides along the grain boundaries evolve from fine distributed block, continuous film into the coarse discrete block. Moreover, theM23C6carbides are mainly enveloped withinγ′ layers along grain boundaries during 1000 °C aging. Creep rupture lifetime and elongation at 760 °C and 645 MPa are improved with increasing the aging temperature. In particular, the creep rupture lifetime of the specimens aging at 1000 °C is one order of magnitude higher than that of the specimens aging at 750 °C. The enhancement of ductility induced by theγ′ envelopes plays a significant role in the improvement of creep rupture lifetime.