Enhanced Grain Refinement and Porosity Control of the Polycrystalline Superalloy by a Modified Thermally Controlled Solidification1 . Issue 10 (17th August 2016)

• Record Type: Journal Article
• Authors: Jie, Ziqi; Zhang, Jun; Huang, Taiwen; Su, Haijun; Li, Yafeng; Liu, Lin; Yang, Wenchao; Fu, Hengzhi
• Is Part Of: Advanced engineering materials. Volume 18:Issue 10(2016:Oct.)
• Page Start: 1785
• Page End: 1791
• Publication Date: 2016-08-17
• Subjects: Materials -- Periodicals; 620.11
• DOI: 10.1002/adem.201600320
• Languages: English
• ISSNs: 1438-1656

Abstract

Abstract : An integrated technique, combining the modified thermally controlled solidification (MTCS) process with the mixed refiner of Co3 FeNb2 and CrFeNb ternary intermetallic compounds, has been designed to enhance grain refinement and restrain porosity in polycrystalline IN718 C superalloy. The refinement efficiency of integrated technique is quite superior to that by convention casting (CC) process with refiner, as experiment results show that the grain size is refined from 3 340 to 126 µm and, during the refinement process, the microstructure of IN718 C superalloy evolves from dendrite to granular structure. Meanwhile, comparing with the CC process, this integrated technique has significantly eliminated porosities and dramatically improved the mechanical properties. Abstract : A technique combined a modified thermally controlled solidification process (MTCS) with mixed refiner is designed to enhance grain refinement and restrain porosity in polycrystalline superalloy castings. In comparison to the conventional casting process (CC), the technique significantly refines grain size, almost eliminates porosities, and dramatically improves the mechanical properties.