摘要
采用非真空混杂熔炼方法对三类废金属进行重熔制备,获得一种CuFeNiCrAl多主元合金,研究了铸态以及退火态合金的组织结构与力学性能。结果表明:合金主要由bcc的α相和fcc的树枝状晶β相组成,多主元合金经热处理后,富Cr的α相尺寸减小且分布更为弥散,区域回熔的细小树枝状晶覆盖在整个合金上;退火后CuFeNiCrAl多主元合金塑性和强度得到提高,经800℃×10 h退火后抗拉强度由490.6 MPa提高到646.1 MPa,延伸率由5.0%提高到11.6%;拉伸试验应力应变曲线呈现异常的"下凹形";铸态断口属于脆性断口,800℃×10 h退火后属于韧性断口。
Three kinds of scrap metal were remelted by non-vacuum hybrid smelting method to obtain a CuFeNiCrAl multiprincipal alloy. The microstructure and mechanical properties of as cast and annealed alloys were investigated. The results show that the alloy consists mainly of the α phase of bcc and the dendritic β phase of fcc. The size of α phase with Cr-rich decreases and its distribution becomes more dispersion after heat treatment. The regional remelted fine dendrites cover the entire alloy. The plasticity and strength of the CuFeNiCrAl multiprincipal alloy after annealing are improved. The tensile strength is increased from 490.6 MPa to 646.1 MPa and elongation increased from 5.0% to 11.6% after annealing at 800 ℃ for 10 h. The stress-strain curve of tensile test shows an abnormal concave shape. The as cast fracture belongs to brittle fracture, the fracture after annealing at 800 ℃ for 10 h is a ductile fracture.
作者
邹艳明
宋伟苑
林高用
ZOU Yan-ming;SONG Wei-yuan;LIN Gao-yong(Department of Electrical and Mechanical Engineering,Qinghai Higher Vocational&Technical Institute,Haidong Qinghai 810700,China;School of Materials Science and Engineering,Central South University,Changsha Hunan 410083,China)
出处
《热处理技术与装备》
2019年第5期24-28,共5页
Heat Treatment Technology and Equipment
