涂层前处理对单晶合金再结晶及元素扩散行为的影响*

doi:10.13385/j.cnki.vacuum.2020.03.06

真空 ›› 2020, Vol. 57 ›› Issue (3): 25-29.doi: 10.13385/j.cnki.vacuum.2020.03.06

涂层前处理对单晶合金再结晶及元素扩散行为的影响^*

王凯, 许振华, 甄真, 戴建伟, 王鑫, 何利民

中国航发北京航空材料研究院,航空材料先进腐蚀与防护航空科技重点实验室,北京100095

收稿日期:2020-01-11 发布日期:2020-06-18
通讯作者: 许振华,研究员。
作者简介:王凯（1986-）,男,陕西省富平市人,硕士,工程师。
基金资助:
重点领域基础研究项目(KH7A190561)

Effect of Grit Blasting on the Recrystallization, Elemental Diffusion Behaviors of Single Crystal Superalloy

WANG Kai, XU Zhen-hua, ZHEN Zhen, DAI Jian-wei, WANG Xin, HE Li-min

AECC Beijing Institute of Aeronautical Materials, Aviation Key Laboratory of Science and Technology on advanced Corrosion and Protection for Aviation Material, Beijing 100095, China

Received:2020-01-11 Published:2020-06-18

摘要/Abstract

摘要： 采用喷砂工艺对单晶高温合金进行了表面前处理,借助真空电弧镀技术在合金基体上制备了NiCoCrAlYHf涂层,研究了热暴露过程涂层前处理对单晶合金再结晶及元素扩散行为的影响。采用扫描电子显微镜（SEM）、能谱仪（EDS）等方法分析了有、无涂层两种状态下的试样显微组织和元素扩散行为,以及其与再结晶现象的作用机制。试验结果表明：随着喷砂强度的增强,合金基体和涂层试样的再结晶尺寸逐渐增大,当喷砂强度为0.2MPa时,涂覆涂层的合金基体无胞状再结晶。但是随着喷砂强度由0.3MPa增加到0.7MPa时,沉积涂层后对单晶合金的再结晶抑制作用有所减弱。经1100℃/250h热暴露测试后,在涂层/基体的界面处未观察到再结晶现象,同时,界面处也未检测到明显的某个元素浓度波动起伏,界面处的元素含量分布趋于平缓。

关键词: 单晶合金, 再结晶, 喷砂, 涂层, 元素扩散

Abstract: The surface of single crystal superalloy was pretreated by grit blasting, and the NiCoCrAlYHf coatings were then fabricated on the superalloy substrates by vacuum arc plating technique. The effect of grit blasting on the recrystallization and elemental diffusion behaviors of substrates after isothermal oxidation was investigated in detail. The microstructure and elemental contents of the samples with and without coatings, as well as their interaction mechanisms with recrystallization behavior, were systematically analyzed by SEM and EDS. The results indicate that the recrystallization sizes of the substrate and coating samples gradually increase with the increment of the grit blasting strengths. The coating specimens show no cellular recrystallization when the grit blasting strength is set to be 0.2MPa. However, the function of recrystallization inhabitation of the coatings gradually decreases with the increment of the grit blasting strengths from 0.3MPa to 0.7MPa. The phenomenon of recrystallization was not observed at the interface between the coating and the substrate after thermal exposure at 1100℃ for 250h. Meanwhile, there was no obvious fluctuation of the elemental concentration at the interface, and the contents of the elements on the interface tend to be smooth.

Key words: single crystal superalloy, recrystallization, grit blasting, coating, elemental diffusion

中图分类号:

TB43

王凯, 许振华, 甄真, 戴建伟, 王鑫, 何利民. 涂层前处理对单晶合金再结晶及元素扩散行为的影响^*[J]. 真空, 2020, 57(3): 25-29.

WANG Kai, XU Zhen-hua, ZHEN Zhen, DAI Jian-wei, WANG Xin, HE Li-min. Effect of Grit Blasting on the Recrystallization, Elemental Diffusion Behaviors of Single Crystal Superalloy[J]. VACUUM, 2020, 57(3): 25-29.

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涂层前处理对单晶合金再结晶及元素扩散行为的影响^*

Effect of Grit Blasting on the Recrystallization, Elemental Diffusion Behaviors of Single Crystal Superalloy

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