Recent Progress of Manufacturing Technologies on C&amp;W Superalloys in China

Du, Jinhui; Deng, Qun; Dong, Jianxin; Xie, Xiangyu; Wang, Zhigang; Zhao, Changhong; Chen, Guosheng; Xie, Weidong; Luo, Tongwei; Xin-cai, Wang; Zhang, Yong

doi:10.1002/9781119016854.ch3

Cited by 3 publications

(4 citation statements)

References 4 publications

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“…Superalloys refined by electroslag remelting have been widely used in aerospace, petrochemical, and other fields [ 1 , 2 ], so there are strict requirements on their properties. The principal components of the strengthening phase in superalloys are Al and Ti, and any alteration in the content of these elements within the alloy will have an impact on their high-temperature properties [ 3 ].…”

Section: Introductionmentioning

confidence: 99%

“…The primary approach to control the content of Al and Ti elements in superalloys during electroslag remelting is to minimize their interaction with the O element. The sources of the O element can be summarized as follows [8][9][10]: (1) the electroslag remelting is conducted in the ambient atmosphere, resulting in a reaction between oxygen and aluminum as well as titanium elements; (2) the electrode surface is not properly cleaned and contains impurities, such as FeO; (3) the slag system contains a small amount of SiO 2 ; (4) the contents of Al 2 O 3 and TiO 2 in the slag are either excessive or insufficient. The primary factor among them is the irrational contents of Al 2 O 3 and TiO 2 in the slag.…”

Section: Introductionmentioning

confidence: 99%

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Control of Aluminum and Titanium Contents in the Electroslag Remelting of ATI 718PlusTM Alloy

Li,

Wang,

Zhu

et al. 2024

Materials

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The burning loss of Al and Ti elements in superalloys during electroslag remelting has become a prevalent issue. And the existing slag system is not suitable for smelting the ATI 718PlusTM alloy. Therefore, it is imperative to develop a new slag system for smelting the ATI 718PlusTM alloy. To mitigate this issue, a thermodynamic model of the oxidation reaction of Al and Ti at the slag and alloy interface was established based on the ion and molecule coexistence theory (IMCT). The thermodynamic model was used to investigate the correlation between the equilibrium content of Al and Ti, slag composition, smelting temperature, and initial Al and Ti content of the electrode. The results indicate that while increasing the smelting temperature can effectively inhibit the burning loss of Al, it will exacerbate the burning loss of Ti. Increasing CaO and Al2O3 contents can inhibit the Al burning loss, while an increase in the TiO2 content can inhibit the Ti burning loss. Although an increase in the MgO content results in the burning loss of Al, its impact on the Al is minimal. The burning loss of Al and Ti was not affected by the change in the CaF2 content. The high Al content in ATI 718PlusTM makes it prone to burning loss of Al during the electroslag remelting. The combustion loss of Al can be reduced by increasing the Ti content in the electrode or adding a suitable amount of aluminum powder to the slag system. The accuracy of the model had been validated through experimental verification.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Control of Aluminum and Titanium Contents in the Electroslag Remelting of ATI 718PlusTM Alloy

Li,

Wang,

Zhu

et al. 2024

Materials

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“…In recent years, many countries, including China, have begun to focus on the research and development of advanced ultra-super-critical technology with a steam temperature of 700 • C, whereby the thermal efficiency of power stations is expected to break through the 50% threshold. The extremely harsh service conditions of this grade of power station have led to the development of specifically designed superalloys as candidate materials [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Influence of Replacing Molybdenum with Tungsten on the Creep Fracture Property of Waspaloy Nickel-Based Alloy

Yao

Dong

Gong

et al. 2022

Metals

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Alloys meeting the requirements of “700 °C and above” advanced ultra-super-critical technology, with higher thermal efficiency, have been developed in recent years. Here, a new wrought Ni-based superalloy with excellent high-temperature creep strength based on Waspaloy has been developed and is proposed as a candidate material for application in 700 °C class advanced ultra-super-critical steam turbine blades. In this new alloy, the Molybdenum (Mo) in Waspaloy is partially replaced by Tungsten (W). Creep tests have shown that this new Ni-based alloy has a 70 MPa higher creep-rupture strength than that of Waspaloy at 700 °C by extrapolating the experimental data. Detailed creep-rupture mechanisms have been analyzed by means of scanning electron microscopy, transmission electron microscopy, and chemical phase analysis with a view to devising potential approaches for performance improvements. The results showed that the partial replacement of Mo by W had negligible effect on the composition of carbides precipitated in the alloy. Instead, the amount of the γ′ phase was significantly increased, and mismatch between the γ and γ′ phases was reduced. In this way, the stability of the γ′ phase was increased, its coarsening rate was reduced, and its critical shear stress was increased. As a result, the high-temperature creep-fracture strength of the new alloy was increased.

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“…Nowadays, the biggest forging has a capacity of 80k ton and is located in China[10] 2. Action to replace composite structures to single components…”

mentioning

confidence: 99%

Distortions in Large Aluminum Forgings: Current Situation and Simulation Challenges

Mena

Guinard

Aguado

et al. 2020

Computational Methods in Applied Sciences

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Distortions after machining of large aluminum forgings are a recurrent problem for the aeronautical industry. These deviations from design geometry are caused by the presence of residual stresses, which are developed along the manufacturing chain. To solve this problem, a series of post-machining operations called reshaping are required. Despite reshaping manages to restore the correct geometry, it is highly manual and time-consuming, therefore, there is a need at an industrial level to use numerical simulation to study reshaping. The present document describes the problem of distortion, the operations required to mitigate these geometrical defects and the challenges associated to simulate reshaping.

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Recent Progress of Manufacturing Technologies on C&W Superalloys in China

Cited by 3 publications

References 4 publications

Control of Aluminum and Titanium Contents in the Electroslag Remelting of ATI 718PlusTM Alloy

Control of Aluminum and Titanium Contents in the Electroslag Remelting of ATI 718PlusTM Alloy

Influence of Replacing Molybdenum with Tungsten on the Creep Fracture Property of Waspaloy Nickel-Based Alloy

Distortions in Large Aluminum Forgings: Current Situation and Simulation Challenges

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