Model alloys based on Alloy 617 were fabricated with modified minor alloying elements for improvement in oxidation resistance in high-temperature steam environments. Model alloys were grouped as one with Ti and Al and the other without. Mn content was varied from 0 to 2 wt% for the alloys within each group. The alloys were subjected to oxidation testing in steam at 900 °C for up to 1000 h. Alloys with Ti and Al showed high weight gains due to fast oxide growth on top of grain boundaries and internal oxidation. Mn addition caused formation of Mn-rich spinels and contributed somewhat to weight gain. On the other hand, for the alloys without Ti and Al, Mn content greater than 0.5 wt% prevented oxide spallation. Tensile properties were not significantly affected by the minor alloying element modifications, and one of the model alloys exhibited comparable creep rupture life to Alloy 617.

中文翻译：

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微量合金元素对高温蒸汽环境中镍基合金氧化行为的影响

基于合金 617 的模型合金采用改良的微量合金元素制造，以提高高温蒸汽环境中的抗氧化性。模型合金分为一种含 Ti 和 Al，另一种不含。对于每组内的合金，Mn 含量从 0 到 2 wt% 不等。这些合金在 900 °C 的蒸汽中进行了长达 1000 小时的氧化测试。由于晶界顶部的氧化物快速生长和内部氧化，Ti 和 Al 合金显示出高增重。添加锰会导致形成富含锰的尖晶石，并在一定程度上增加了重量。另一方面，对于不含 Ti 和 Al 的合金，Mn 含量大于 0.5 wt% 可防止氧化物剥落。轻微的合金元素改变对拉伸性能没有显着影响，