电脉冲处理HSi59-2.5硅黄铜热处理后的相组成
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摘要
采用固溶时效热处理对电脉冲处理后的HSi59-2.5硅黄铜进行了软化处理,分析了电脉冲处理硅黄铜中β相与γ相的转变特点,探究了这种变化与基体硬度及合金切削性能的关系。结果表明,在相同固溶处理条件下,电脉冲处理使硅黄铜中γ相数量减少,β/γ溶解度曲线随合金元素Zn含量变化更趋平缓,导致Cu-Zn相图中β相区向右扩大。随固溶温度降低,电脉冲处理硅黄铜组织中的γ相增加,且分布均匀;随着时效温度的降低,γ相析出数量逐渐减小。电脉冲处理硅黄铜热处理后的显微硬度均较未处理的有明显降低。
Solution and aging were carried out for softening the electro-pulse-modified( EPM) HSi59-2. 5 silicon brass. Changing features ofβ and γ phase in the EPM silicon brass were analyzed,and relationship between this changes and the matrix hardness along with the cutting performance were investigated. The results indicate that the quantity of γ phase decreases in the EPM silicon brass under the same condition of solution,and EPM brass leads to a flatter β / γ solubility curve with Zn content changing than that of the untreated one,which results in the enlarging β phase zone of Cu-Zn to the right. With solution temperature decreasing,the quantity of γ phase in EPM silicon brass increases,and even distribution presented. Meanwhile,with aging temperature decreasing,the precipitation amount of γ phase decreases gradually.The microhardness of the EPM brass after heat treatment is reduced obviously than that of the no EPM one.
Solution and aging were carried out for softening the electro-pulse-modified( EPM) HSi59-2. 5 silicon brass. Changing features ofβ and γ phase in the EPM silicon brass were analyzed,and relationship between this changes and the matrix hardness along with the cutting performance were investigated. The results indicate that the quantity of γ phase decreases in the EPM silicon brass under the same condition of solution,and EPM brass leads to a flatter β / γ solubility curve with Zn content changing than that of the untreated one,which results in the enlarging β phase zone of Cu-Zn to the right. With solution temperature decreasing,the quantity of γ phase in EPM silicon brass increases,and even distribution presented. Meanwhile,with aging temperature decreasing,the precipitation amount of γ phase decreases gradually.The microhardness of the EPM brass after heat treatment is reduced obviously than that of the no EPM one.
引文
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[5]覃静丽,肖来荣,易丹青,等.铋对无铅易切削黄铜性能的影响[J].材料科学与工程学报,2008,26(3):457-459.
[6]肖来荣,张路怀,刘彦,等.镁黄铜的组织与性能研究[J].材料工程,2010(8):10-14.
[7]黄劲松,彭超群,章四琪,等.无铅易切削铜合金[J].中国有色金属学报,2006,16(9):1486-1493.
[8]庞晋山.无铅易切削黄铜的研制及其性能研究[D].广州:广东工业大学,2001.
[9]王建中.电脉冲孕育处理技术与液态金属团簇结构假说的研究[D].北京:北京科技大学,1998.
[10]Qi Jingang,Wang Jianzhong,Liu Xingjiang,et al.Casting structure of pure aluminum by electric pulse modification at different superheated temperatures[J].Journal of University Science and Technology Beijing,2005,12(6):527-530.
[11]He Lijia,Wang Jianzhong,Qi Jingang,et al.Influences of electric pulse on solidification structure of LM-29 Al-Si alloy[J].China Foundry,2010,7(2):153-156.
[12]王冰,王建中,曹丽云,等.电脉冲孕育处理对Al-5%Cu-0.8%Mn合金组织及性能的影响[J].北京科技大学学报,2008,30(4):396-399.
[13]石向东,薛庆国,王静松,等.电脉冲处理时间对Al-18%Si合金凝固组织的影响[J].金属热处理,2005,30(12):72-75.
[14]Zhao Zuofu,Qi Jingang,Dai Shan,et al.Effects of different melt modification techniques on the structure and properties of silicon brass[J].Advanced Materials Research,2011,299-300:390-394.
[15]Qi Jingang,Wang Jianzhong,He Lijia,et al.An investigation for structure transformation in electric pulse modified liquid aluminum[J].Physica B:Condensed Matter,2011,406(4):846-849.
[16]肖寅昕,匡同春,蔡英儿.新型高锌加工黄铜变质处理研究[J].特种铸造及有色合金,1998(5):21-23.
[17]庞晋山,曹标,陈明.变质处理对环境友好型硅黄铜γ相及切削性能的影响[J].机械工程材料,2012,36(5):73-75.