单级时效对稀土铝电工圆杆组织与性能的影响
|
摘要
研究了耐热铝合金电工圆杆单级时效过程中时效温度和时间对铝合金力学性能和导电率的影响。采用金相显微镜及扫描电镜观察和对比了不同时效处理制度下铝合金的显微组织。结果表明,单级时效处理的温度越高,铝合金达到峰时效的时间越短,其对应的峰时效强度越低。时效初期,导电率随时效时间的延长而不断上升,且时效温度越高,第二相析出速率越快,铝合金抗拉强度和导电率的增长速率越快;时效后期,试样抗拉强度下降,而导电率升高。最佳单级时效工艺为150℃×10 h,此时导电率为62.5%IACS,抗拉强度为78.5 MPa。
The effects of aging temperature and aging time on mechanical properties and electrical conductivity of Re-bearing aluminum electrical round bars during the single-stage aging of heat-resistant aluminum alloy electrical rods were studied. The microstructures of alloys under different aging treatments were observed and compared by metallographic method and SEM. The results show that the higher the temperature of single stage aging treatment is,the shorter the time of aluminum alloy to reach the peak aging,and the lower the corresponding peak aging strength. At the early stage of aging,the electric conductivity rises with the increase of aging time,and the higher the aging temperature is,the faster the second phase precipitation rate is,and the faster the aluminum alloy' s tensile strength and electrical conductivity increase. At the later aging stage,the tensile strength of the sample decreases while the conductivity increases. The best single-stage aging process is 150 ℃ × 10 h,when the conductivity is62. 5% IACS,and the tensile strength is 78. 5 MPa.
The effects of aging temperature and aging time on mechanical properties and electrical conductivity of Re-bearing aluminum electrical round bars during the single-stage aging of heat-resistant aluminum alloy electrical rods were studied. The microstructures of alloys under different aging treatments were observed and compared by metallographic method and SEM. The results show that the higher the temperature of single stage aging treatment is,the shorter the time of aluminum alloy to reach the peak aging,and the lower the corresponding peak aging strength. At the early stage of aging,the electric conductivity rises with the increase of aging time,and the higher the aging temperature is,the faster the second phase precipitation rate is,and the faster the aluminum alloy' s tensile strength and electrical conductivity increase. At the later aging stage,the tensile strength of the sample decreases while the conductivity increases. The best single-stage aging process is 150 ℃ × 10 h,when the conductivity is62. 5% IACS,and the tensile strength is 78. 5 MPa.
引文
[1]王贵明,郝逸云,王小平.提高电工圆铝杆质量的途径[J].世界有色金属,2004(4):46-47.
[2]刘斌,郑秋,党朋,等.铝合金在架空导线领域的应用及发展[J].电线电缆,2012(4):10-15.
[3]卢庆清.新型耐热导线在高压输电线路增容改造中的应用[J].福建建设科技,2015(1):69-71.
[4]唐继朋.耐热铝合金导线在电网建设中的应用[J].陕西电力,2008(3):49-51.
[5]章德胜,刘平,刘新宽,等.高导电率、高强度耐热铝合金导体材料的研究进展[J].热加工工艺,2012(24):24-27.
[6]赵清汝.第二相对铝合金导电及力学性能的影响与调控[D].济南:山东大学,2016.
[7]李志辉,熊柏青,张永安,等.单级时效对7B04预拉伸厚板组织和性能的影响[J].中国有色金属学报,2005,15(11):24-28.
[8]李志辉,熊柏青,张永安,等.7B04铝合金双级时效的微观组织与性能[J].稀有金属材料与工程,2008,37(3):521-524.
[9]胡谢君,张仁国,张晓燕,等.形变热处理工艺对铝合金电工圆杆性能的影响[J].有色金属(冶炼部分),2017(8):59-62.
[10]宁爱林,孙瑜,黄继武.不同时效工艺对6063铝合金组织和力学性能的影响[J].机械工程材料,2013(3):28-31.
[11]王惠,张晓燕,李若楠,等.形变时效处理对铝合金电工圆杆抗拉强度和导电率的影响[J].有色金属(冶炼部分),2017(5):54-58.
[12]JY AN JOHN WANG,EDGAR LARA CURZIO,THOMAS J KING,et al.The integrity of ACSR full tension singlestage splice connector at higher operation temperature[R].IEEE transactions on power delivery,ORNL/TM-2008/156,affiliation:oak ridge national laboratory.
[13]ANIJDAN S H M,KANG D,SINGH N,et al.Precipitation behavior of strip cast Al-Mg-0.4Sc-0.15Zr alloy under single and multiple-stage aging processes[J].Materials science&engineering A,2015,640:275-279.
[14]TAO W,YIN Z M,KAI S,et al.Single-aging characteristics of 7055 aluminum alloy[J].Transactions of nonferrous metals society of China,2007,17(3):548-552.
[15]张保丰,蔡海勇,鲁中健,等.固溶和时效处理对Al0.6Fe0.25Cu合金冷拉拔导线组织和性能的影响[J].铸造技术,2014,35(11):2547-2550.
[2]刘斌,郑秋,党朋,等.铝合金在架空导线领域的应用及发展[J].电线电缆,2012(4):10-15.
[3]卢庆清.新型耐热导线在高压输电线路增容改造中的应用[J].福建建设科技,2015(1):69-71.
[4]唐继朋.耐热铝合金导线在电网建设中的应用[J].陕西电力,2008(3):49-51.
[5]章德胜,刘平,刘新宽,等.高导电率、高强度耐热铝合金导体材料的研究进展[J].热加工工艺,2012(24):24-27.
[6]赵清汝.第二相对铝合金导电及力学性能的影响与调控[D].济南:山东大学,2016.
[7]李志辉,熊柏青,张永安,等.单级时效对7B04预拉伸厚板组织和性能的影响[J].中国有色金属学报,2005,15(11):24-28.
[8]李志辉,熊柏青,张永安,等.7B04铝合金双级时效的微观组织与性能[J].稀有金属材料与工程,2008,37(3):521-524.
[9]胡谢君,张仁国,张晓燕,等.形变热处理工艺对铝合金电工圆杆性能的影响[J].有色金属(冶炼部分),2017(8):59-62.
[10]宁爱林,孙瑜,黄继武.不同时效工艺对6063铝合金组织和力学性能的影响[J].机械工程材料,2013(3):28-31.
[11]王惠,张晓燕,李若楠,等.形变时效处理对铝合金电工圆杆抗拉强度和导电率的影响[J].有色金属(冶炼部分),2017(5):54-58.
[12]JY AN JOHN WANG,EDGAR LARA CURZIO,THOMAS J KING,et al.The integrity of ACSR full tension singlestage splice connector at higher operation temperature[R].IEEE transactions on power delivery,ORNL/TM-2008/156,affiliation:oak ridge national laboratory.
[13]ANIJDAN S H M,KANG D,SINGH N,et al.Precipitation behavior of strip cast Al-Mg-0.4Sc-0.15Zr alloy under single and multiple-stage aging processes[J].Materials science&engineering A,2015,640:275-279.
[14]TAO W,YIN Z M,KAI S,et al.Single-aging characteristics of 7055 aluminum alloy[J].Transactions of nonferrous metals society of China,2007,17(3):548-552.
[15]张保丰,蔡海勇,鲁中健,等.固溶和时效处理对Al0.6Fe0.25Cu合金冷拉拔导线组织和性能的影响[J].铸造技术,2014,35(11):2547-2550.