100 kg级Cu-15Fe合金的制备及组织性能研究

Microstructure and Properties of 100 kg Level Cu-15Fe Alloy

旨在为Cu-Fe合金的实际工程应用提供指导和依据,在大气环境下感应熔炼制备100 kg级超大Cu-15Fe合金铸锭,并轧制成厚度0.1 mm的薄板。采用手持式XRF分析仪测试铸锭不同区域的Fe含量分布;采用金相显微镜观察了Cu-15Fe合金铸锭和轧板的显微组织;采用拉伸机、数字微欧计、维氏硬度计分别测试Cu-15Fe轧板的抗拉强度、导电率和HV硬度。结果表明:100 kg级铸锭底部区域Fe相分布的均匀性明显好于顶部区域,铸锭顶部后凝固区虽存在一定的偏析问题,但顶部切片和底部切片Fe含量平均值的差异不大。合金锭的铸态组织中大部分Fe枝晶非常粗大,厚度超过15μm。最大的Fe枝晶长度超过200μm,厚度大于20μm。经过轧制加工后,Fe枝晶被大幅细化,最低厚度小于600 nm。轧板抗拉强度在600~658 MPa之间,导电率介于42.2%~48.9%IACS,HV硬度在164.0~168.2之间。

In order to provide technical guidance and basis for the engineering practice of Cu-Fe alloy,a 100 kg level super large Cu-15Fe alloy ingot was prepared by induction melting in the at-mosphere,and then was cold rolled into plates with 0.1 mm thickness.Mass fraction of Fe at differ-ent areas of the as cast alloy was obtained by Niton XL3t GOLDD Handheld XRF Analyzer.Micro-structure of the as cast ingot and the cold rolled plate was measured by the Leica Microsystems.Ulti-mate strength,electrical conductivity and HV hardness of the rolled Cu-15Fe plates were conduc-ted on WDTⅡ-20 testing machine,micro-ohmmeter and Vickers hardness tester respectively.Results show that the distribution of Fe fraction is more homogeneous in the bottom area of this 100 kg level ingot than the top area.The difference in the average value of Fe content between theplates cutting from the top and bottom areas of the ingot is small,though a little gravity segregationcan still be observed.The Fe dendrites are very coarse in this 100 kg level ingot,and most of themare thicker than 15μm.The length and thickness of some Fe dendrites are even more than 200μmand 20μm respectively.Part of the Fe dendrite can be refined to less than 600 nm after cold roll-ing.The ultimate strength,electrical conductivity and HV hardness of the rolled Cu-15Fe plates are 600~658 MPa,42.2%~48.9%IACS and 164.0~168.2 respectively.