Cu-Cr-Zr-Fe-P合金组织与性能的研究

发布时间：2018-01-08 06:26

本文关键词：Cu-Cr-Zr-Fe-P合金组织与性能的研究　出处：《南昌航空大学》2015年硕士论文　论文类型：学位论文

【摘要】：本文在传统点焊电极用Cu-Cr-Zr合金的基础上,添加Fe、P元素,通过多元复合强化方法提高电极用铜合金的综合性能。实验设计了Cu-0.6Cr-0.15Zr、Cu-0.6Cr-0.15Zr-2.5Fe、Cu-0.6Cr-0.15Zr-2.5Fe-0.06P、Cu-0.6Cr-0.15Zr-0.12Fe-0.06P四种不同成分合金。研究Cu-Cr-Zr-Fe-P合金在不同热处理工艺下组织与性能的变化,主要结果如下:(1)铸态下,在Cu-0.6Cr-0.15Zr合金中添加Fe,合金硬度有所上升,导电率有所下降。Fe元素的添加可以细化Cu-0.6Cr-0.15Zr合金的晶粒,添加2.5wt%Fe使Cu-0.6Cr-0.15Zr合金基体组织由柱状晶转变为等轴晶。添加0.06wt%P对合金组织与性能影响不大。(2)研究不同固溶温度对Cu-0.6Cr-0.15Zr-2.5Fe-0.06P合金组织与性能的影响发现,固溶温度在900℃~980℃时,合金导电率随固溶温度上升而下降,硬度随固溶温度上升而上升。980℃固溶2h,导电率和硬度分别为26%IACS和93.44HV。不同成分合金980℃固溶2h的性能与铸态相比,导电率均有所下降,Cu-0.6Cr-0.15Zr和Cu-0.6Cr-0.15Zr-0.12Fe-0.06P合金硬度有所下降,而Cu-0.6Cr-0.15Zr-2.5Fe和Cu-0.6Cr-0.15Zr-2.5Fe-0.06P合金,因过剩相溶解造成的固溶强化超过了过剩相溶解导致的软化,硬度相比铸态有所上升。(3)研究不同成分合金980℃固溶2h后不同时效时间与时效温度下的组织与性能发现,添加0.12wt%Fe的Cu-0.6Cr-0.15Zr-0.12Fe-0.06P合金,时效析出相主要成分是是以Cr为主的(CrZrFeP)化合物和(CrZrP)化合物,在500℃X3h的较佳时效工艺下,硬度值可达154.76HV,导电率可达76.2%IACS,软化温度在603℃左右,与较佳时效工艺下的Cu-0.6Cr-0.15Zr合金性能相比,硬度和软化温度有所上升,导电率有所下降。添加2.5wt%Fe的Cu-0.6Cr-0.15Zr-2.5Fe-0.06P合金,时效态存在较多粗大的析出相,其成分主要是以Fe为主的(CrFe)化合物和(CrZrFe P)化合物,以及百分含量相近的(CrFeP)化合物,其时效强化效果不佳,较佳时效工艺下的导电率和硬度均低于Cu-0.6Cr-0.15Zr合金。添加0.06wt%P对合金时效性能影响不大。不同成分合金在不同时效工艺下的整体变化规律为:随时效时间的延长,析出相增多、长大,导电率逐渐上升,最终趋于平稳,硬度先上升,达到硬化峰值后下降。时效温度升高,析出相快速析出、长大、粗化,导电率快速上升,到达硬化峰值所需时间变短。(4)对比Cu-0.6Cr-0.15Zr-2.5Fe-0.06P合金铸态+时效与980℃X2h固溶+时效处理工艺下的组织和性能发现,该合金经固溶+时效处理后析出相分布更均匀,硬度更高,但两者导电率相差不大。
[Abstract]:On the basis of the traditional spot welding electrode for Cu-Cr-Zr alloy based on the addition of Fe, P elements, through the comprehensive performance of multielement composite strengthening method to improve copper alloy electrode. The experimental design of Cu-0.6Cr-0.15Zr, Cu-0.6Cr-0.15Zr-2.5Fe, Cu-0.6Cr-0.15Zr-2.5Fe-0.06P, Cu-0.6Cr-0.15Zr-0.12Fe-0.06P four kinds of alloy. Study on change of microstructure and properties of Cu-Cr-Zr-Fe-P alloy in different heat treatment processes, mainly the results are as follows: (1) cast, adding Fe in Cu-0.6Cr-0.15Zr alloy, the hardness of the alloy increased, the conductivity decreased by addition of.Fe can refine the grain of Cu-0.6Cr-0.15Zr alloy, the microstructure of Cu-0.6Cr-0.15Zr alloy with 2.5wt%Fe transition from columnar crystal to equiaxed crystal. Adding 0.06wt%P has little effect on the structure and properties of alloy. (2) to study the effect of different solid solution on Microstructure and properties of Cu-0.6Cr-0.15Zr-2.5Fe-0.06P alloy temperature Find the solution temperature at 900 DEG ~980 DEG, alloy conductivity decreases with the increase of solution temperature, hardness with solution temperature increased.980 C 2H in solution, compared the hardness and conductivity properties of 26%IACS and 93.44HV. respectively for different components of alloy 980 DEG 2H solid solution and cast, conductive rate decreased, hardness of Cu-0.6Cr-0.15Zr alloy and Cu-0.6Cr-0.15Zr-0.12Fe-0.06P alloy decreased, while Cu-0.6Cr-0.15Zr-2.5Fe and Cu-0.6Cr-0.15Zr-2.5Fe-0.06P alloy, solid solution strengthening over the solution of excess phase leads to softening due to excess phase solubility, hardness compared to the casting increased. (3) of different components of alloy 980 DEG 2H solid solution after different aging time and aging temperature of the organization the performance of Cu-0.6Cr-0.15Zr-0.12Fe-0.06P and found that 0.12wt%Fe added alloy, precipitation is the main component is mainly based on Cr (CrZrFeP) and compound (CrZrP) compounds, In the preferred aging process 500 DEG X3h, the hardness can reach 154.76HV, the conductivity can reach 76.2%IACS, the softening temperature at 603 degrees Celsius, the properties of Cu-0.6Cr-0.15Zr alloy with better ageing processes than hardness and softening temperature increased, the conductivity decreased. Cu-0.6Cr-0.15Zr-2.5Fe-0.06P alloy with 2.5wt% Fe, there are more precipitation and aging the coarse phase, its composition is mainly dominated by Fe (CrFe) and compound (CrZrFe P) compounds, and percentage of similar compounds (CrFeP), the aging strengthening effect is poor, the better aging process under the conductivity and hardness of the alloy is lower than that of Cu-0.6Cr-0.15Zr. Adding 0.06wt%P has little effect on the aging properties of the alloy. The overall variation in different aging process under different composition alloy: with the prolongation of aging time, precipitation increased, the conductivity increased gradually grew up, the final hardness tends to be steady. First up, reach the hardening peak and then decreased. The increase of aging temperature, precipitation phase rapid precipitation, growth, coarsening, the conductivity increased rapidly, reaching the peak hardening are shorter. (4) compared with the Cu-0.6Cr-0.15Zr-2.5Fe-0.06P alloy casting + aging and 980 DEG X2h solid solution + aging process of microstructure and properties, the alloy after solid solution and aging treatment after precipitation phase distribution is more uniform, higher hardness, but the conductivity has little difference.

【学位授予单位】：南昌航空大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG146.11

【参考文献】