热轧生产工艺对C70250合金力学性能和导电性能的影响  

Effects of hot rolling process on mechanical and electrical properties of C70250 alloy

作　　者：李华清[1,2] 汤玉琼[1] 汪明朴[2] 

机构地区：[1]苏州有色金属研究院,苏州215026 [2]中南大学材料科学与工程学院,长沙410083

出　　处：《中国有色金属学报》2010年第1期62-66,共5页The Chinese Journal of Nonferrous Metals

基　　金：中国铝业公司科技发展基金资助项目(2007KJA10)

摘　　要：在模拟工业化生产条件下研究C70250合金的热轧、固溶及时效处理工艺,对比C70250合金板坯的热轧、热轧+时效、热轧+冷轧+时效后合金的力学性能与导电性能,同时研究空冷与水冷对材料力学性能的影响。结果表明:时效析出为C70250合金的主要强化手段,时效前的塑性加工能使合金强度提高4%～5%。XRD分析表明:C70250合金铸锭经热轧开坯,在575～725℃之间保温1h,析出相以Ni2Si为主;合金开轧与终轧温度应控制在(900±50)～725℃之间,热轧板冷却速度不小于2.5℃/s;固溶处理制度为(900±50)℃、1～3h;时效工艺为400～450℃、4～6h,该工艺制备的C70250合金抗拉强度不小于644MPa,电导率IACS为40%,伸长率为8%。Hot rolling, solid solution and ageing treatment of C70250 alloy were investigated by mimicking the commercial process. The mechanical and electrical properties of C70250 alloy were analyzed under hot rolling state, aging after hot rolling and aging after cold roiling following hot rolling. The effects of quenching and cooling by radiation on the mechanical properties were also investigated. The results show that aging precipitation is the primary strengthening method for the C70250 alloy. The plastic working prior to the aging process improves the tensile strength by 4%-5%. The hot working temperature should be controlled between （900-/-50）℃ and 725℃ and followed with on-line quenching. The cooling velocity of hot rolling plate is equal to or higher than 2.5 ℃/s. XRD analysis results show that the main precipitation phase is Ni2Si after C70250 alloy is hot rolled and kept at 575-725℃ for 1 h. The preferable off-line treatment process is heated at above （9004-50）℃ for 1-3 h. The suitable aging process is 400-450℃ for about 4-6 h. The tensile strength, electrical conductivity （IACS） and elongation of the treated alloy are larger than 644 MPa, 40% and 8%, respectively.

关 键 词：C70250合金 热轧 时效 

分 类 号：TG146.1[一般工业技术—材料科学与工程]