Microstructure control and hot cracking behavior of the new Ni-Co based superalloy prepared by electron beam smelting layered solidification technology

作     者：Hongyang Cui Yi Tan Lidan Ning Rusheng Bai Xiaogang You Chuanyong Cui Pengting Li 

作者机构：School of Materials Science and EngineeringDalian University of TechnologyDalian 116024China Key Laboratory for Energy Beam Metallurgy and Advanced Materials Preparation of Liaoning ProvinceDalian 116024China Superalloys DivisionInstitute of Metal ResearchChinese Academy of SciencesShenyang 110016China 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2024年第175卷第8期

页      面：55-71页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：support from the National Key Research and Development Program of China(Grant No.2019YFA0705300) the National Natural Science Foundation of China(GrantNo.52004051) the Innovation Team Projectfor Key Fields of Dalian(Grant No.2019RT13) 

主　　题：Electron beam smelting layered solidification technology CET Thermal cycling Hot cracking 

摘      要：The prevention of hot cracking formation is of utmost importance in the production of the new Ni-Co based superalloys through the utilization of the electron beam smelting layered solidification technique(EBSL),as it ensures exceptional homogeneity and dependable consistency of the *** contrast to previous studies that focused on minimizing the liquid film and solidification range,our methodology adopts a distinct *** this research,a novel methodology was employed to mitigate internal stresses through the implementation of equiaxed grain layers via an alternately reduced cooling *** ultimately resulted in the elimination of hot *** be more specific,the transition from a columnar to an equiaxed structure was observed during the layer-by-layer construction process in the fabrication of the new Ni-Co based superalloy in *** EBSL-Ni-Co superalloy,when subjected to the alternating reduction cooling method,exhibited an internal stress of 49 *** value represents a significant reduction of 83.8%compared to the internal stress observed when employing the linear reduction cooling ***,the solvus temperature of theγ-γ’eutectic phases in EBSL-Ni-Co superalloys produced by the alternating reduction cooling method is significantly ***,the Nth layer of the EBSL-Ni-Co based superalloys produced by EBSL simultaneously heats treated with the preceding *** the low melting point phase gradually dissolved back into the *** implementation of an alternating reduced cooling method successfully mitigated the formation of the liquid film in theγ-γ’eutectic phase and the buildup of internal stresses in the EBSL-Ni-Co superalloy during its manufacturing *** discoveries open up a novel preparation procedure pathway for the manufacture of crack-free superalloys with superior mechanical characteristics using EBSL.