Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 31    No. 4    April 2021

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Eliminating shrinkage defects and improving mechanical performance of large thin-walled ZL205A alloy castings by coupling travelling magnetic fields with sequential solidification
Lei LUO, Hong-ying XIA, Liang-shun LUO, Yan-qing SU, Chao-jun CAI, Liang WANG, Jing-jie GUO, Heng-zhi FU

National Key Laboratory for Precision Hot Processing of Metals, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China

Abstract:ZL205A alloys with large thin-walled shape were continuously processed by coupling travelling magnetic fields (TMF) with sequential solidification, to eliminate the shrinkage defects and optimize the mechanical performance. Through experiments and simulations, the parameter optimization of TMF and the influence on feeding behavior, microstructure and properties were systematically studied. The results indicate that the magnetic force maximizes at the excitation current of 20 A and frequency of 200 Hz under the experimental conditions of this study, and increases from center to side-walls, which is more convenient to process thin-walled castings. TMF can break secondary dendritic arm and dendrites overlaps, widen feeding channels, prolong the feeding time, optimize the feeding paths, eliminate shrinkage defects and improve properties. Specifically, for as-cast state, TMF with excitation current of 20 A increases ultimate tensile strength, elongation and micro-hardness from 186 MPa, 7.3% and 82.1 kg/mm2 to 221 MPa, 11.7% and 100.5 kg/mm2, decreases porosity from 1.71% to 0.22%, and alters brittle fracture to ductile fracture.

 

Key words: ZL205A alloys; large thin-walled alloy castings; travelling magnetic fields; sequential solidification; shrinkage defects; mechanical performance

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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