涂覆热障涂层构件的热梯度机械疲劳行为研究

doi:10.11901/1005.3093.2016.147

材料研究学报

2017, Vol. 31

Issue (1): 9-17 DOI: 10.11901/1005.3093.2016.147

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涂覆热障涂层构件的热梯度机械疲劳行为研究

黄丰¹,聂铭¹,林介东¹,华旭²,陈国锋²,周忠娇³(

)

1 广东电网有限责任公司电力科学研究院广州 510080
2 西门子中国研究院上海 200082
3 清华大学摩擦学国家重点实验室微纳制造分室北京 100084

The Thermal Gradient Mechanical Fatigue Behavior of Nickel-based Superalloy with Thermal Barrier Coatings

Feng HUANG¹,Ming NIE¹,Jiedong LIN¹,Xu HUA²,Guofeng CHEN²,Zhongjiao ZHOU³(

)

1 Guangdong Power Grid Co.,Ltd.,Electric Power Research Institute,Guangzhou 510080,China
2 Corporate Technology,Siemens,Shanghai 200082,China
3 Division of Micro/Nano Manufacturing,State Key Laboratory of Tribology,Tsinghua University,Beijing 100084,China

引用本文:

黄丰,聂铭,林介东,华旭,陈国锋,周忠娇. 涂覆热障涂层构件的热梯度机械疲劳行为研究[J]. 材料研究学报, 2017, 31(1): 9-17.
Feng HUANG, Ming NIE, Jiedong LIN, Xu HUA, Guofeng CHEN, Zhongjiao ZHOU. The Thermal Gradient Mechanical Fatigue Behavior of Nickel-based Superalloy with Thermal Barrier Coatings[J]. Chinese Journal of Materials Research, 2017, 31(1): 9-17.

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摘要:

研究了应变幅、预氧化及高温保载时间对涂覆热障涂层高温合金样品的热梯度机械疲劳性能的影响。结果表明,随应变幅增大,样品疲劳寿命降低。随着预氧化及高温保载时间的增加,样品的氧化损伤增大,疲劳寿命也不断降低。试验过程中,粘结层氧化形成的热生长氧化物层(TGO层)破裂而萌生裂纹,裂纹沿粘结层/TGO层界面扩展而形成分层裂纹,分层裂纹与陶瓷层内贯穿裂纹连接导致陶瓷层剥落而失效。考虑到热障涂层内最大应力及氧化损伤,建立了一个涂覆热障涂层高温合金样品的热梯度机械疲劳寿命预测模型。

关键词 ：材料表面与界面, 热障涂层, 热梯度机械疲劳寿命, 应变幅, 预氧化, 高温保载时间

Abstract：

As the key material of components used for elevated temperature gas turbines,the failure mechanism of thermal barrier coatings (TBCs) under service conditions has been the hot spot of research for a long time. The influence of strain range,pre-oxidation and dwelling time at the maximum temperature on the thermal gradient mechanical fatigue (TGMF) behavior of a superalloy with TBCs was investigated. It is demonstrated that the fatigue life decreases with the increase of strain range. With the increase of pre-oxidation and dwelling time,more oxidation damage is induced,thus resulting in shortened fatigue life. During tests,bond coat gets oxidized and forms thermally grown oxide (TGO) at the bond coat/ceramic top coat interface. Cracks are initiated in TGO and propagate along the bond coat/ceramic top coat interface,forming laminated cracks. When the laminated ion connect with the segmentation cracks in ceramic top coat,the TBCs spall. At last,a TGMF lifetime model is established by considering the influence of mechanical strain and oxidation damage.

Key words： surface and interface in the materials thermal barrier coating thermal gradient mechanical fatigue strain range pre-oxidation dwelling time

收稿日期: 2016-03-21

基金资助:南方电网科研项目(KGD2014-0595)

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https://www.cjmr.org/CN/10.11901/1005.3093.2016.147 或 https://www.cjmr.org/CN/Y2017/V31/I1/9

表1 MGA1400高温合金基体的化学成分

图1 TGMF试样示意图(a)及涂覆热障涂层的试样(b)

图2 热梯度机械疲劳试验机(a)及热电偶及应变计连接方式(b)

图3 热梯度机械疲劳试验加载曲线

表2 热障涂层喷涂工艺参数

表3 热梯度机械疲劳样品的试验条件

图4 制备态热障涂层的组织形貌: (a)整体形貌, (b)基体/粘结层界面, (c)粘结层形貌, (d)粘结层/陶瓷层界面, (e)陶瓷层形貌

图5 热障涂层材料体系的热梯度机械疲劳寿命

图6 热梯度机械疲劳试验第一周和稳态滞后回线的比较

图7 热梯度机械疲劳试验后样品4的横截面形貌

表4 热障涂层中承受的径向应力

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