The influence of substrate temperature on the microstructure and hardness of vacuum-plasma-sprayed CoNiCrAlSiZrY and CoNiCrAlY alloys
The influence of substrate temperature on the microstructure and hardness of vacuum-plasma-sprayed CoNiCrAlSiZrY and CoNiCrAlY alloys
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DOI：
10.1016/0921-5093(89)90411-5
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发表时间：
1989-02
期刊：
影响因子：
6.4
通讯作者：
B. Gudmundsson;B. Jacobson;H. Gruner
中科院分区：
文献类型：
--
作者：
B. Gudmundsson;B. Jacobson;H. Gruner
基体温度是影响等离子喷涂涂层微观结构和性能的一个沉积参数。在这项研究中，真空等离子喷涂Co <$Ni <$Cr <$Al <$Si <$Zr <$Y和Co <$Ni <$Cr <$Al <$Y涂层的显微组织和硬度与基底温度和沉积后热处理（1120 °C，2小时和845 °C，24小时）相关。扫描电镜、透射电镜和X射线衍射分析表明，随着基体温度的升高，Co <$Ni <$Cr <$Al <$Si <$Zr <$Y和Co <$Ni <$Cr <$Al <$Y涂层的晶粒长大，硬度降低。Co <$Ni <$Cr <$Al <$Si <$Zr <$Y涂层为单相γ（f.c.c.）在沉积状态下。根据Hall-Petch关系，晶粒尺寸与硬度相关。热处理后，所有Co <$Ni <$Cr <$Al <$Si <$Zr <$Y涂层具有相同的硬度和γ（f.c.c.）三相结构，γ′-Ni 3Al（有序f.c.c.）和α-Cr（b.c.c.）。在预热基体上喷涂的Co <$Ni <$Cr <$Al <$Y涂层具有γ（f.c.c.）β-NiAl（B_2，b.c.c.）在不预热的情况下，应力诱导的H_2CO_3-Co（h. c. p.）因此形成高硬度值。热处理后，所有涂层均具有相同的硬度和稳定的γ（f.c.c.）β-NiAl（B_2，b.c.c.）
The substrate temperature is one deposition parameter known to influence the microstructure and properties of plasma-sprayed coatings. In this study, the microstructure and hardness of vacuum-plasma-sprayed CoNiCrAlSiZrY and CoNiCrAlY coatings were correlated to the substrate temperature and the post-deposition heat treatment (1120 °C for 2 h and 845 °C for 24 h). The microstructural features were revealed by scanning and transmission electron microscopy and X-ray diffraction.An increased substrate temperature results in grain growth and lower hardness values for both CoNiCrAlSiZrY and the CoNiCrAlY coatings. The CoNiCrAlSiZrY coatings are single-phase γ (f.c.c.) in the as-deposited condition. The grain size was correlated to the hardness according to the Hall-Petch relationship. After heat treatment, all CoNiCrAlSiZrY coatings have the same hardnesses and a three-phase structure of γ (f.c.c.), γ′-Ni3Al (ordered f.c.c.) and α-Cr (b.c.c.). The as- deposited CoNiCrAlY coatings sprayed on preheated substrates have a dual-phase structure of γ (f.c.c.) and β-NiAl (B2, ordered b.c.c.). Without preheating, stress-induced ϵ-Co (h.c.p.) forms with high hardness values as a result. After heat treatment, all coatings have the same hardnesses and a stable dual-phase structure of γ (f.c.c.) and β-NiAl (B2, ordered b.c.c.).