Predication of the Defects and Optimization of the Technology for the Investment Casting of Thin-wall Experimental Cartridge Receiver Made of K439B Superalloy

Author of the article:ZHENG Boyuan 1 , WU Yidong 1 , CHEN Jingyang 2 , XIAO Chengbo 2 , LI Zongzhen 3 , HUI Xidong 1

Author's Workplace：1. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China; 2. Science and Technology on Advanced High Temperature Structural Materials Laboratory, Beijing Institute of Aeronautical Materials, Beijing 100095, China; 3. Jiangsu JITRI Advanced Energy Materials Research Institute Co., Ltd., Changzhou 213032, China

Key Words：numerical simulation; experimental cartridge receiver; investment casting; ProCAST; shrinkages and porosity

Abstract： In this work, numerical simulations were performed on the pouring process, temperature fields and the fraction
of solid phase during the investment casting of experimental cartridge receiver made of 800 ℃ K439B weldable superalloy, by
using ProCAST software based on the macro- and microscale couple model of shrinkages and porosity developed according
to Darcy law. It is found that shrinkage and porosity are formed at the bottom of casting which has thin wall due to the
existence of isolation liquid phase area. New technologies were further designed by adding feeding sprues. The simulation
results show that the shrinkages and porosity can be effectively eliminated after adding 8 feeding sprues. Experimental cartridge
receiver with good metallurgical quality is successfully produced by the optimized technology.