Low cycle fatigue behavior and microstructural evolution of nickel-based superalloy M951G at elevated temperatures
Low cycle fatigue behavior and microstructural evolution of nickel-based superalloy M951G at elevated temperatures
复制标题
镍基高温合金 M951G 高温下的低周疲劳行为和显微组织演变
DOI：
10.1016/j.matchar.2020.110241
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发表时间：
2020-05
影响因子：
4.7
通讯作者：
Sun Xiaofeng
中科院分区：
文献类型：
--
作者：
Cui Luqing;Liu Jinlai;Peng Ru Lin;Yu Jinjiang;Moverare Johan;Sun Xiaofeng
对新研制的镍基高温合金M951G在900℃和1000℃下进行了不同总应变幅值下的低周疲劳试验。结果表明，合金的疲劳性能、断裂机制以及γ′析出相的粗化程度与试验温度和应变幅值有关。相同总应变幅下的疲劳寿命和循环应力响应在1000℃时低于900℃时，这是由于组织退化、γ′析出相位错剪切和严重氧化所致。随着应变幅值的增大，断裂模式由晶间断裂转变为混合断裂。在低应变幅下，由于表面碳化物的氧化和相对较低的变形速率，M951G合金以晶间裂纹的形式失效。在较高应变幅值下，应变局部化、破碎碳化物和共晶的分布以及较高的应变速率是穿晶微裂纹形成的主要原因。最后从γ′体积分数、疲劳寿命和γ/γ′界面流动应力差等方面分析了疲劳条件对立方γ′析出相粗化的影响。
Low cycle fatigue (LCF) tests of the newly developed nickel-based superalloy M951G have been conducted at 900 and 1000 °C under different total strain amplitudes. Results show that the fatigue properties, fracture mechanisms as well as coarsening of γ′ precipitates are dependent on testing temperatures and strain amplitudes. Fatigue life and cyclic stress response under the same total strain amplitude at 1000 °C are lower than that at 900 °C, which is due to the degradation of microstructures, shearing of γ′ precipitates by dislocations and serious oxidation. Fracture modes change from intergranular cracking to the mixed mode cracking as the strain amplitude increases. At low strain amplitudes, M951G alloy fails in the form of intergranular cracking owing to the oxidation of surface carbides and the relatively low deformation rate. At higher strain amplitudes, the strain localization in grain interior, the distribution of broken carbides and eutectics as well as the relatively higher strain rate are the main reasons for the formation of transgranular microcracks. Ultimately, the effects of fatigue conditions on coarsening of cubic γ′ precipitates are also analyzed from the aspect of γ′ volume fraction, fatigue life and flow stress difference between the γ/γ′ interfaces.
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DOI：
10.1007/bf02647085
发表时间：
1987-01
期刊：
Metallurgical Transactions A
影响因子：
--
作者：
B. Lerch;V. Gerold
通讯作者：
B. Lerch;V. Gerold
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DOI：
10.1016/s1359-6454(01)00232-4
发表时间：
2001-09
期刊：
Acta Mater
影响因子：
--
作者：
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通讯作者：
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影响因子：
8.4
作者：
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通讯作者：
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DOI：
10.1016/0025-5416(83)90134-9
发表时间：
1983-03
期刊：
Materials Science and Engineering
影响因子：
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作者：
J. Reuchet;L. Rémy
通讯作者：
J. Reuchet;L. Rémy
影响因子：
6
作者：
M. Nazmy;J. Denk;R. Baumann;A. Künzler
通讯作者：
M. Nazmy;J. Denk;R. Baumann;A. Künzler