首页|行波磁场耦合顺序凝固改善ZL205A大型薄壁件缺陷及性能

行波磁场耦合顺序凝固改善ZL205A大型薄壁件缺陷及性能

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利用行波磁场耦合顺序凝固连续地处理大型薄壁ZL205A合金铸件,消除收缩缺陷,提高力学性能.实验结合模拟,针对行波磁场参数优化对补缩行为、显微组织和性能的影响进行系统的研究.结果表明,本研究条件下,当励磁电流为20 A、频率为200 Hz时,磁场力达到最大值;磁场力随着到磁场发生器距离越近而越大,更有利于对薄壁铸件进行处理.行波磁场可以有效破碎二次枝晶臂和枝晶间的搭接,拓宽补缩通道,延长补缩时间,优化补缩路径,最终消除收缩缺陷并提高力学性能.当励磁电流为20 A时,铸态合金极限抗拉强度、伸长率和显微硬度分别由186 MPa、7.3％和82.1 kg/mm2提高至221 MPa、11.7％和100.5 kg/mm2,孔隙率由1.71％降至0.22％,断裂模式由脆性转变为韧性断裂.
Eliminating shrinkage defects and improving mechanical performance of large thin-walled ZL205A alloy castings by coupling travelling magnetic fields with sequential solidification
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.

ZL205A alloyslarge thin-walled alloy castingstravelling magnetic fieldssequential solidificationshrinkage defectsmechanical performance

罗磊、夏宏营、骆良顺、苏彦庆、蔡超军、王亮、郭景杰、傅恒志

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哈尔滨工业大学 材料科学与工程学院 金属精密热加工国家重点实验室,哈尔滨 150001

ZL205A合金 大型薄壁合金铸件 行波磁场 顺序凝固 收缩缺陷 力学性能

authors are grateful for the financial supports from the National Key Research and Development Program of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of China

2017YFA04038045142540251671073

2021

10.1016/S1003-6326(21)65545-0

中国有色金属学报(英文版)
中国有色金属学会

中国有色金属学报(英文版)

CSTPCDCSCDSCI
影响因子：1.183
ISSN：1003-6326
年,卷(期)：2021.31(4)
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