Title: Identification and verification of convective heat transfer coefficient in the investment casting process by an integrated inverse method

Authors: Zhengye Zhang; Anping Dong; Zhongfeng Chen; Dashan Sui; Baode Sun

Addresses: School of Materials Science and Engineering, Shanghai Key Lab of Advanced High-Temperature Materials and Precision Forming, Shanghai Jiao Tong University, Shanghai, 200240, China ' School of Materials Science and Engineering, Shanghai Key Lab of Advanced High-Temperature Materials and Precision Forming, Shanghai Jiao Tong University, Shanghai, 200240, China ' School of Materials Science and Engineering, Shanghai Key Lab of Advanced High-Temperature Materials and Precision Forming, Shanghai Jiao Tong University, Shanghai, 200240, China ' School of Materials Science and Engineering, Shanghai Key Lab of Advanced High-Temperature Materials and Precision Forming, Shanghai Jiao Tong University, Shanghai, 200240, China ' School of Materials Science and Engineering, Shanghai Key Lab of Advanced High-Temperature Materials and Precision Forming, Shanghai Jiao Tong University, Shanghai, 200240, China

Abstract: Accurately determining the convective heat transfer coefficient (CHTC) in casting is complex due to various influencing factors. This study developed an inverse CHTC calculation model for investment casting, incorporating nonlinear characteristics and using an integrated approach with ABAQUS, Python, and MATLAB. A temperature measurement experiment was conducted to investigate the time-varying CHTC between the inner and outer surfaces of a preheated mould shell and the surrounding environment. The model's accuracy was assessed by comparing simulated temperature fields using time-varying versus constant CHTC. Results revealed that CHTC varied over time and space, with transitions from forced to stable natural convection on the outer surface and continuous natural convection on the inner surface. The inverse calculation method significantly improved the accuracy of the simulation model during the air-cooling process of the preheated mould shell.

Keywords: CHTC; convective heat transfer coefficient; investment casting process; inverse calculation model; integrated simulation.

DOI: 10.1504/IJCMSSE.2025.146307

International Journal of Computational Materials Science and Surface Engineering, 2025 Vol.12 No.2, pp.95 - 113

Received: 11 Oct 2023
Accepted: 06 Mar 2024
Published online: 20 May 2025 *

Full-text access for editors Full-text access for subscribers Purchase this article Comment on this article