The effect of Ni additions on the oxidation behaviour of Co–Re–Cr high-temperature alloys
The effect of Ni additions on the oxidation behaviour of Co–Re–Cr high-temperature alloys
复制标题
Ni添加量对CoâReâCr高温合金氧化行为的影响
DOI：
10.1080/09603409.2017.1392111
复制
发表时间：
2018
影响因子：
1.3
通讯作者：
J. Rösler
中科院分区：
文献类型：
--
作者：
K. Esleben;B. Gorr;H.-J. Christ;D. Mukherji;J. Rösler
研究了Ni对Co-Re-Cr基合金显微组织和氧化行为的影响。在800-1100 °C的实验室空气中测试具有三种不同Ni含量的合金。观察到σ相体积分数的细化和减少以及基体显微组织的变化。热重分析结果表明，镍含量较高的合金在高温下具有较好的抗氧化性能。所有合金在800 °C下氧化期间由于多孔氧化物膜的形成而遭受连续的质量损失，所述多孔氧化物膜由Co 3 O 4、Co（Ni）O和Ni掺杂的CoCr 2 O 4组成，其允许Re氧化物的蒸发。在900-1100 °C下，只有含25 at. % Ni的合金在短暂的瞬时氧化后表现出抛物线氧化动力学。这是由于Cr2 O3保护层的快速形成。研究还发现，暴露于1000 °C的空气中会导致块状材料的相变;在氧化物鳞片附近观察到氧化诱导的细六方密堆积（hcp）晶粒的形成。认为含Ni的Co-Re-Cr合金的抗氧化性能的提高是由于Ni的加入增强了Cr的扩散。在合金基体中大量形成面心立方相对含Ni的Co-Re-Cr基合金的氧化行为有不利影响。
The present study focused on the influence of Ni on the microstructure and oxidation behaviour of Co–Re–Cr-based alloys. Alloys with three different Ni contents were tested in laboratory air at 800–1100 °C. A refinement and a reduction of the σ phase volume fraction as well as a change in the matrix microstructure were observed. Thermogravimetric measurements showed that the alloys with higher Ni contents possess a better oxidation resistance when exposed to higher temperatures. All alloys suffered from continuous mass loss during oxidation at 800 °C due to the formation of porous oxides scales, consisting of Co3O4, Co(Ni)O and Ni-doped CoCr2O4, which allow the evaporation of Re-oxides. At 900–1100 °C, only the alloy with 25 at. % Ni showed parabolic oxidation kinetics after a short period of transient oxidation. This is a result of the fast formation of a protective Cr2O3layer. It was also found that exposure to air at 1000 °C leads to a phase transformation of the bulk material; an oxidation-induced formation of fine hexagonal close-packed (hcp) grains was observed near the oxide scales. It is supposed that the improved oxidation resistance of Ni-containing Co–Re–Cr alloys is a result of enhanced Cr diffusion caused by the Ni addition. The extensive formation of the fcc phase in the alloy matrix had a detrimental effect on the oxidation behaviour of the Ni-containing Co–Re–Cr-based alloys.
登录
查看更多内容
Co-10 w/o Cr 合金的高温氧化 I 氧化皮的微观结构。
DOI：
--
发表时间：
1969
期刊：
影响因子：
--
作者：
A. Hed;P. Kofstad
通讯作者：
P. Kofstad
影响因子：
0.8
作者：
Mukherji, Debashis;Roesler, Joachim;Piegert, Sebastian
通讯作者：
Piegert, Sebastian
影响因子：
3.9
作者：
FREDERICK, SF;CORNET, I
通讯作者：
CORNET, I
铬在 ALPHA 钴铬固体溶液中的扩散
DOI：
--
发表时间：
1951
期刊：
影响因子：
--
作者：
J. W. Weeton
通讯作者：
J. W. Weeton
影响因子：
4.4
作者：
Depka, Timo;Somsen, Christoph;Roesler, Joachim
通讯作者：
Roesler, Joachim