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首页> 外文期刊>Materials Science and Engineering >The influence of microstructure on the ductile to brittle transition and fracture behaviour of HVOF NiCoCrAlY coatings determined via small punch tensile testing
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The influence of microstructure on the ductile to brittle transition and fracture behaviour of HVOF NiCoCrAlY coatings determined via small punch tensile testing

机译：通过小冲头拉伸试验确定的显微组织对HVOF NiCoCrAlY涂层的韧性至脆性转变和断裂行为的影响

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摘要

The development of new thermal barrier coatings (TBC's) capable of increasing the efficiency of gas-powered turbines requires an understanding of how the tensile behaviour and ductile to brittle transition temperature (DBTT) of MCrAlY bond coats are influenced by the coating microstructure. In this study, small punch tensile (SPT) tests were conducted on two high velocity oxy-fuel (HVOF) NiCoCrAlY coatings. Both coatings, referred to as BC1 and BC2, comprised a BCC beta-NiAl matrix with FCC gamma-Ni and TCP sigma-Cr2Co secondary phases. Coating BC2 also contained FCC gamma'-Ni3Al. Small punch tensile (SPT) tests were conducted on the coatings between RT and 750 degrees C. The DBTT's of coatings BC1 and BC2 were found to be 600-700 degrees C and 650-750 degrees C respectively. Lower phase fractions of gamma-Ni were shown to increase the DBTT. The main mode of crack propagation in both coatings was intergranular fracture along the grain boundaries of differing phases. Schematic models were used to demonstrate the change in tensile behaviour across the DBTT and explain the influence of the coating micro-structure on the fracture behaviour of both coatings.
机译：能够提高燃气涡轮机效率的新型热障涂层（TBC）的开发，需要了解MCrAlY粘结涂层的拉伸性能和韧性至脆性转变温度（DBTT）如何受到涂层微观结构的影响。在这项研究中，对两种高速含氧燃料（HVOF）NiCoCrAlY涂层进行了小冲孔拉伸（SPT）测试。两种涂层，分别称为BC1和BC2，均包含具有FCCγ-Ni和TCP sigma-Cr2Co二级相的BCCβ-NiAl基体。涂层BC2还包含FCCγ'-Ni3Al。在室温和750摄氏度之间的涂层上进行小冲孔拉伸（SPT）测试。发现涂层BC1和BC2的DBTT分别为600-700摄氏度和650-750摄氏度。较低的γ-Ni相分数可提高DBTT。两种涂层中裂纹扩展的主要方式是沿不同相晶界的晶间断裂。原理图模型用于说明整个DBTT的拉伸行为的变化，并解释了涂层微观结构对两种涂层的断裂行为的影响。

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