Multilayer Structure of DZ445 Ni-Based Superalloy Formed by Long Time Oxidation at High Temperature
Received date: 2021-11-12
Revised date: 2022-03-08
Online published: 2022-05-13
Supported by
National Natural Science Foundation of China(51871142);Independent Research and Development Project of State Key Laboratory of Advanced Special Steel, Shanghai Key Laboratory of Advanced Ferrometallurgy, Shanghai University(SKLASS 2020-Z04);Science and Technology Commission of Shanghai Municipality(19DZ2270200)
Nickel-based superalloys have been widely used in aero engines and gas turbines because of their excellent high-temperature strength and exceptional oxidation resistance. The oxidation resistance is obtained using the thermal barrier coatings and alloying elements. In the previous investigations, the oxidation time of the nickel-based superalloys has been focused on hundreds of hours. However, in practice, the superalloys last far longer. This study investigated the superalloy DZ445's oxidation behavior at 900oC for 300-2600 h. An oxidation film with a four-layer structure is formed after oxidation at 900oC for 500 h and above. The outermost layer is primarily composed of NiCr2O4, Cr2O3, and TiO2. The subouter layer consists of CrTaO4 and TiO2, and the subinner layer consists of Al2O3, NiCr2O4, and NiO. The innermost layer is primarily Al2O3. The appearances of the subouter layer and subinner layer greatly reduce the oxidation rate of the alloy, which is represented by the dramatic increase in the oxidation kinetics equation exponent and a sharp reduction of the oxidation rate constant. The formation of subouter layer changes the oxidation mechanism from outward diffusion of alloy elements to O-inward diffusion. When the subinner layer is formed, the oxidation behavior is controlled using the outward diffusion of Ni and Cr and the O-inward diffusion. The multilayer structure gave the alloy an excellent oxidation resistance capacity.
Key words： Ni-based superalloy; oxidation; multi-layer structure oxide film
Laidi LIU , Biao DING , Weili REN , Yunbo ZHONG , Hui WANG , Qiuliang WANG . Multilayer Structure of DZ445 Ni-Based Superalloy Formed by Long Time Oxidation at High Temperature[J]. Acta Metall Sin, 2023 , 59(3) : 387 -398 . DOI: 10.11900/0412.1961.2021.00482
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