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Nondestructive characterization of elastic modulus of APS Ni–5Al/10hBN coating on stainless steel 304 under high temperature
Archives of Civil and Mechanical Engineering ( IF 4.4 ) Pub Date : 2020-06-09 , DOI: 10.1007/s43452-020-00076-4
Cheng-Hung Yeh , N. Jeyaprakash , Che-Hua Yang

The failure mechanisms of coatings, under high thermo-mechanical loads, can be examined through finite element simulations. However, mechanical properties such as Young’s modulus and Poisson’s ratio are necessary to achieve an accurate model. In this study, nickel–aluminum with hexagonal boron nitride (NiAl/hBN) is deposited on stainless steel 304 substrate using atmospheric plasma spray technique. The effect of the hydrogen content in the plasma-formed gas on the microstructure, hardness, and porosity of the deposited layers is examined. Also, the mechanical properties of the coating are measured at ambient temperatures using non-contact laser ultrasound technique. Results indicated that the flow rate of hydrogen has a major impact on the coating structure and elastic properties. The inhomogeneity in the coating can be minimized by decreasing the hydrogen flow rate. The coating Young’s modulus was increased at room temperature, which slowly decreased while increase in atmospheric temperature. The behavior of Young’s modulus at high temperature causes decrease in flexural strength. In addition, the back calculations are well agreed with experimental results.

中文翻译:

高温下不锈钢304上APS Ni-5Al / 10hBN涂层的弹性模量的无损表征

可以通过有限元模拟来检查在高热机械负荷下涂层的失效机理。然而,诸如杨氏模量和泊松比之类的机械性能对于获得精确的模型是必需的。在这项研究中,使用常压等离子体喷涂技术将镍铝和六方氮化硼(NiAl / hBN)沉积在304不锈钢基底上。检查了等离子体形成的气体中氢含量对沉积层的微观结构,硬度和孔隙率的影响。同样,使用非接触激光超声技术在环境温度下测量涂层的机械性能。结果表明,氢气的流速对涂层的结构和弹性有重要影响。涂层中的不均匀性可以通过降低氢气流速来减小。涂层的杨氏模量在室温下增加,而在大气温度增加时缓慢下降。高温下杨氏模量的行为导致抗弯强度降低。此外,反向计算与实验结果非常吻合。
更新日期:2020-06-09
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