The Experts below are selected from a list of 195 Experts worldwide ranked by ideXlab platform

J Sieniawski - One of the best experts on this subject based on the ideXlab platform.

  • investigation of casting Ceramic shell Mold interface thermal resistance during solidification process of nickel based superalloy
    Experimental Thermal and Fluid Science, 2017
    Co-Authors: Dariusz Szeliga, K Kubiak, Waldemar Ziaja, Rafal Cygan, Sz J Suchy, A Burbelko, W J Nowak, J Sieniawski
    Abstract:

    Abstract The study of thermal resistance (TR) at the casting-Mold interface has been performed to describe the solidification process aimed at the improvement of technology and the reduction of defect quantity of investment castings. The analysis of thermal resistance at casting–Mold interface between the solidifying IN 713C nickel superalloy plate casting and Ceramic shell Mold has been presented. The temperature measurements in the plate casting of IN 713C nickel superalloy and the Ceramic shell Mold were carried out to determine the casting–Mold interface heat transfer coefficient (IHTC) with the use of inverse heat conduction method. The calculations were performed using a ProCAST software. It was found that the casting–Mold IHTC (7962 Wm −2  K −1 ) was the highest for the alloy in the liquid state and then it intensively decreased during solidification and cooling followed by its increase close to the end of the solidification process forming another peak on the obtained curve. The formation mechanism of gap between the Ceramic Mold and Ni based superalloy casting as well as another peak were proposed taking into account the occurrence of mixed oxide scale at the interface. On the basis of numerical simulation, it was found that the IHTC had less influence on cooling rate of casting than the thickness, thermal conductivity and emissivity of the Mold for the applied technological parameters of the process.

  • Investigation of casting–Ceramic shell Mold interface thermal resistance during solidification process of nickel based superalloy
    Experimental Thermal and Fluid Science, 2017
    Co-Authors: Dariusz Szeliga, K Kubiak, Waldemar Ziaja, Rafal Cygan, A Burbelko, W J Nowak, J. Sz. Suchy, J Sieniawski
    Abstract:

    Abstract The study of thermal resistance (TR) at the casting-Mold interface has been performed to describe the solidification process aimed at the improvement of technology and the reduction of defect quantity of investment castings. The analysis of thermal resistance at casting–Mold interface between the solidifying IN 713C nickel superalloy plate casting and Ceramic shell Mold has been presented. The temperature measurements in the plate casting of IN 713C nickel superalloy and the Ceramic shell Mold were carried out to determine the casting–Mold interface heat transfer coefficient (IHTC) with the use of inverse heat conduction method. The calculations were performed using a ProCAST software. It was found that the casting–Mold IHTC (7962 Wm −2  K −1 ) was the highest for the alloy in the liquid state and then it intensively decreased during solidification and cooling followed by its increase close to the end of the solidification process forming another peak on the obtained curve. The formation mechanism of gap between the Ceramic Mold and Ni based superalloy casting as well as another peak were proposed taking into account the occurrence of mixed oxide scale at the interface. On the basis of numerical simulation, it was found that the IHTC had less influence on cooling rate of casting than the thickness, thermal conductivity and emissivity of the Mold for the applied technological parameters of the process.

  • The Control of Solidification Kinetics of the Vacuum-cast Thin-wall Nickel-based Superalloys by Changing the Geometrical Characteristics of the Ceramic Mold
    Archives of Foundry Engineering, 2013
    Co-Authors: Rafał Cygan, Dariusz Szeliga, J Sieniawski, Paweł Rokicki, J. S. Suchy
    Abstract:

    This paper provides an analysis of experimental research and results of investment casting process. Temperature field in a Ceramic Mold is one of the problems during numerical simulation. Reducing the costs of production in precision casting involves the reduction of scraps, which is one of the fundamental problems of the foundry industry. Reducing these costs is associated with optimization of precision casting technology of aircraft engines critical parts, including control of the solidification front in thin-walled castings of nickel super alloys cast in a vacuum. It is achieved by changing the geometrical characteristics of the Ceramic Mold. The results of the tests were used to optimize the industrial production of aircraft components in Precision Foundry of WSK Rzeszow. Temperature distribution gained in the conducted tests allowed verification and optimization of computer simulations.

Yang Liying - One of the best experts on this subject based on the ideXlab platform.

  • centrifugal precision cast tial turbocharger wheel using Ceramic Mold
    Journal of Materials Processing Technology, 2008
    Co-Authors: Wang Shouren, Guo Peiquan, Yang Liying
    Abstract:

    Abstract It is the potential candidate for gamma TiAl-based alloys that would replace Ni-based superalloys, which are being used in fabrication of the turbocharger wheel currently. Cast Ti–47Al–2Cr–2Nb alloys due to their specific performance requirement are now on the verge of a commercial application. A novel precision casting technique, which combines the Ceramic Mold casting with centrifugal casting, was described in this work. Multiple-section Ceramic Mold was designed and fabricated successfully. All the Mold sections fit together to form a cavity and then open in many directions to eject the Molded part. Microstructures and mechanical properties of cast Ti–47Al–2Cr–2Nb alloys under the action of centrifugal force are discussed.

Yang Song - One of the best experts on this subject based on the ideXlab platform.

  • fabrication of single crystal superalloy hollow blade based on integral Ceramic Mold
    Journal of Materials Processing Technology, 2019
    Co-Authors: Guoqiang Tian, Kai Miao, Fu Wang, Weijun Zhu, Hang Zhang, Yong Wang, Yang Song
    Abstract:

    Abstract The integral Ceramic Mold technique based on stereolithography additive manufacturing and gelcasting technology was applied to casting single-crystal (SX) superalloy parts. The fabrication process for producing alumina-based Ceramic Molds with kyanite additive and the resultant Mold structures were investigated. The results showed that the fabricated alumina-based Molds exhibited superior high-temperature mechanical performance and dimensional stability. The high-temperature mechanical performance was attributed to the addition of suitable amounts of kyanite, which led to the mullitization of the raw materials. Moreover, the volume expansion that accompanied kyanite decomposition enabled well-controlled sintering shrinkage and apparent porosity. The Ceramic Molds prepared with the optimal amount of kyanite exhibited favorable bending strength, creep deformation, sintering shrinkage, and apparent porosity for directional solidification of SX superalloys. Cast trials of a hollow turbine blade using CMSX-4 SX superalloy demonstrated the potential of the proposed approach for rapid-cast SX superalloy parts.

Dariusz Szeliga - One of the best experts on this subject based on the ideXlab platform.

  • investigation of casting Ceramic shell Mold interface thermal resistance during solidification process of nickel based superalloy
    Experimental Thermal and Fluid Science, 2017
    Co-Authors: Dariusz Szeliga, K Kubiak, Waldemar Ziaja, Rafal Cygan, Sz J Suchy, A Burbelko, W J Nowak, J Sieniawski
    Abstract:

    Abstract The study of thermal resistance (TR) at the casting-Mold interface has been performed to describe the solidification process aimed at the improvement of technology and the reduction of defect quantity of investment castings. The analysis of thermal resistance at casting–Mold interface between the solidifying IN 713C nickel superalloy plate casting and Ceramic shell Mold has been presented. The temperature measurements in the plate casting of IN 713C nickel superalloy and the Ceramic shell Mold were carried out to determine the casting–Mold interface heat transfer coefficient (IHTC) with the use of inverse heat conduction method. The calculations were performed using a ProCAST software. It was found that the casting–Mold IHTC (7962 Wm −2  K −1 ) was the highest for the alloy in the liquid state and then it intensively decreased during solidification and cooling followed by its increase close to the end of the solidification process forming another peak on the obtained curve. The formation mechanism of gap between the Ceramic Mold and Ni based superalloy casting as well as another peak were proposed taking into account the occurrence of mixed oxide scale at the interface. On the basis of numerical simulation, it was found that the IHTC had less influence on cooling rate of casting than the thickness, thermal conductivity and emissivity of the Mold for the applied technological parameters of the process.

  • Investigation of casting–Ceramic shell Mold interface thermal resistance during solidification process of nickel based superalloy
    Experimental Thermal and Fluid Science, 2017
    Co-Authors: Dariusz Szeliga, K Kubiak, Waldemar Ziaja, Rafal Cygan, A Burbelko, W J Nowak, J. Sz. Suchy, J Sieniawski
    Abstract:

    Abstract The study of thermal resistance (TR) at the casting-Mold interface has been performed to describe the solidification process aimed at the improvement of technology and the reduction of defect quantity of investment castings. The analysis of thermal resistance at casting–Mold interface between the solidifying IN 713C nickel superalloy plate casting and Ceramic shell Mold has been presented. The temperature measurements in the plate casting of IN 713C nickel superalloy and the Ceramic shell Mold were carried out to determine the casting–Mold interface heat transfer coefficient (IHTC) with the use of inverse heat conduction method. The calculations were performed using a ProCAST software. It was found that the casting–Mold IHTC (7962 Wm −2  K −1 ) was the highest for the alloy in the liquid state and then it intensively decreased during solidification and cooling followed by its increase close to the end of the solidification process forming another peak on the obtained curve. The formation mechanism of gap between the Ceramic Mold and Ni based superalloy casting as well as another peak were proposed taking into account the occurrence of mixed oxide scale at the interface. On the basis of numerical simulation, it was found that the IHTC had less influence on cooling rate of casting than the thickness, thermal conductivity and emissivity of the Mold for the applied technological parameters of the process.

  • The Control of Solidification Kinetics of the Vacuum-cast Thin-wall Nickel-based Superalloys by Changing the Geometrical Characteristics of the Ceramic Mold
    Archives of Foundry Engineering, 2013
    Co-Authors: Rafał Cygan, Dariusz Szeliga, J Sieniawski, Paweł Rokicki, J. S. Suchy
    Abstract:

    This paper provides an analysis of experimental research and results of investment casting process. Temperature field in a Ceramic Mold is one of the problems during numerical simulation. Reducing the costs of production in precision casting involves the reduction of scraps, which is one of the fundamental problems of the foundry industry. Reducing these costs is associated with optimization of precision casting technology of aircraft engines critical parts, including control of the solidification front in thin-walled castings of nickel super alloys cast in a vacuum. It is achieved by changing the geometrical characteristics of the Ceramic Mold. The results of the tests were used to optimize the industrial production of aircraft components in Precision Foundry of WSK Rzeszow. Temperature distribution gained in the conducted tests allowed verification and optimization of computer simulations.

Xuefeng Yang - One of the best experts on this subject based on the ideXlab platform.

  • Fabrication processing and mechanical properties of Si3N4 Ceramic turbocharger wheel
    Ceramics International, 2018
    Co-Authors: Daosheng Wen, Shouren Wang, Gaoqi Wang, Pei Quan Guo, Liying Yang, Xuefeng Yang
    Abstract:

    Abstract A composite technique was chosen to fabricate Si 3 N 4 Ceramic turbine wheel based on modified investment casting (MIC), slip casting (SP) and Mold constraint hot isostatic pressing (MCHIP) aided by a near-net dimension using the gypsum Mold and multi-piece Y 2 O 3 Ceramic Mold. The detailed fabrication processing of Si 3 N 4 Ceramic turbine wheel was described. And the flexural strength and fracture toughness after different work temperature and speed were discussed. The results showed that owing to occurrence of phase transformation and chemical reaction, excess temperature resulted in interface cracking and interface debonding, flexural strength and fracture toughness decrease. Thermal expansion and centrifugal force under excessive high speed brought many pores in the microstructure and resulted in crack initiation and crack propagation. The critical work temperature was 700 °C and critical work speed was 100,000 r/min, which were obtained from the test and simulation results.