The Effects of Grain Size and Twins Density on High Temperature Oxidation Behavior of Nickel-Based Superalloy GH738.
The Effects of Grain Size and Twins Density on High Temperature Oxidation Behavior of Nickel-Based Superalloy GH738.
复制标题
晶粒尺寸和孪晶密度对镍基高温合金GH738高温氧化行为的影响
DOI：
10.3390/ma13184166
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发表时间：
2020-09-19
期刊：
影响因子：
--
通讯作者：
Yang X
中科院分区：
文献类型：
--
作者：
Ma W;Luo H;Yang X
本文采用室温机械加工（RTM）和低温抛光（LTB）等表面处理技术改善GH738合金的显微组织。在RTM和LTB试样的上表面均出现了纳米晶粒和纳米孪晶。研究发现，虽然RTM和LTB试样的晶粒尺寸几乎相同，但产生了不同类型的纳米孪晶。研究了RTM和LTB工艺对GH738镍基高温合金700 °C高温氧化行为的影响。结果表明，LTB试样具有最好的抗高温氧化性能，这是由于其表面形成了纳米晶粒和较高的孪晶密度，在氧化层与基体的界面处形成了连续的Al2O3保护层。结果表明，该层抑制了O的内扩散和Ti的外扩散，显著提高了LTB试样的抗氧化性能。进一步阐明了高温氧化过程中纳米晶粒和晶体缺陷对元素扩散机制的影响。
In the present study, surface treatment techniques such as room temperature machining (RTM) and low temperature burnishing (LTB) processing have been used to improve the microstructure of GH738 superalloy. Nano-grains and nano-twins are obtained on the top surface of RTM and LTB specimens. It is found that although the grain size of RTM and LTB specimens is almost the same, different types of nano-twins have been produced. Moreover, the effect of RTM and LTB processing on high temperature oxidation behavior of nickel-based superalloy GH738 at 700 °C is investigated. The result shows that LTB specimen has the best high temperature oxidation resistance owing to the formation of nano-grains and higher twins density, which induce to form a continuous protective Al2O3 layer at the interface between outer oxide layer and matrix. It is observed that this layer inhibits the inward diffusion of O and outward diffusion of Ti and significantly improves oxidation resistance of LTB specimen. Furthermore, the effects of nano-grains and crystal defects on the diffusion mechanism of elements are clarified during the high temperature oxidation test.
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