Morphology Evolution of γ′ Precipitates during Isothermal Exposure in Wrought Ni-Based Superalloy Inconel X-750
Morphology Evolution of γ′ Precipitates during Isothermal Exposure in Wrought Ni-Based Superalloy Inconel X-750
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DOI：
10.2320/matertrans.m2016376
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发表时间：
2017-01-01
影响因子：
1.2
通讯作者：
Takeyama, Masao
中科院分区：
文献类型：
--
作者：
Hisazawa, Hiromu;Terada, Yoshihiro;Takeyama, Masao
研究了变形镍基高温合金Inconel X-750中γ '相和晶格失配度随等温时效的形态演变。伽马形态在伽马/伽马界面处的形状、分布、聚结和相干性方面发生显著变化。这些过程及其对温度的依赖性通过量化相关的形态参数被总结为γ '形态图以及时间-温度-沉淀（TTP）图。通过X射线衍射测量晶格错配，并且是正的;它从室温下的0.6%降低到老化温度下的0.1%。这些结果表明，γ '相的形态变化是由于很低的晶格失配度、弹性场的相互作用、γ/γ'相的体积分数和界面的不相干性造成的。
The morphological evolution of gamma' precipitates and lattice misfit with isothermal aging were closely investigated in wrought Ni-based superalloy Inconel X-750. The gamma' morphology dramatically changes in terms of shape, distribution, coalescence and coherency at the gamma/gamma' interface. These processes and their dependence on temperature are summarized as a gamma' morphology map together with a time-temperature-precipitation (TTP) diagram through quantifying relevant morphological parameters. The lattice misfit was measured by X-ray diffraction and is positive; it decreases from 0.6% at room temperature to 0.1% at the aging temperature. These results suggest that the morphological changes of the gamma' precipitates are attributable to very low lattice misfit, the interaction of the elastic field, the volume fraction of the precipitates and incoherence in gamma/gamma' interface.