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Compositional effects on the cyclic oxidation resistance of conventional superalloys

机译：成分对常规高温合金抗循环氧化性能的影响

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摘要

The 1100 degrees C cyclic oxidation performance of 25 Ni-base commercial and developmental alloys was compiled from an extensive database and ranked according to the 200 h weight change. Cyclic oxidation performance of superalloys is directly controlled by composition. These conventionally cast superalloys were composed of base elements [Ni-Co-Cr-Al], refractory elements [Nb-Mo-Ta-W], oxygen-active elements [Ti-Zr-Hf], light elements [B, C], and occasionally [V-Mn-Si], with P and S trace impurities. The oxidation results were broadly categorised as less than 4 mg/cm(2) weight loss for alloys with high 5-6% Al and 3-9% Ta, and with low <= 1% Ti ( wt.%). Conversely, weight loss of 200-300 mg/cm2 characterised alloys containing low < 3.5% Al, no Ta, and high > 3% Ti. These trends correlated with beneficial and detrimental scale phases previously reported. An unambiguous Cr effect was masked because of its strongly coupled, but inverse, correlation with Al. Multiple linear regression was used to fit alloy composition to a simple logarithmic weight change transform. The function contained 10 terms and yielded a correlation coefficient, r(2), of 0.84. Various graphical representations helped to further illustrate, quantify, and predict complex oxidation effects within a 10-element compositional space.
机译：从一个广泛的数据库中汇编了25种镍基商业和开发合金的1100℃循环氧化性能，并根据200 h的重量变化进行排名。高温合金的循环氧化性能直接受组成控制。这些常规铸造的高温合金由基本元素[Ni-Co-Cr-Al]，耐火元素[Nb-Mo-Ta-W]，氧活性元素[Ti-Zr-Hf]，轻元素[B，C]组成，偶尔还有[V-Mn-Si]和P和S的痕量杂质。对于具有高5-6％的Al和3-9％的Ta和低<= 1％的Ti（wt。％）的合金，氧化结果大致可归类为小于4 mg / cm（2）重量损失。相反，重量损失为200-300 mg / cm2的特征是含有低<3.5％Al，无Ta和高> 3％Ti的合金。这些趋势与先前报道的有益和有害规模阶段有关。 Cr的明确效果被掩盖了，因为它与Al具有强耦合但成反比的关系。使用多元线性回归将合金成分拟合为简单的对数重量变化变换。该函数包含10个项，相关系数r（2）为0.84。各种图形表示形式有助于进一步说明，量化和预测10个元素组成空间内的复杂氧化作用。

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