锆和锶对铸态镍铝青铜组织与性能的影响  

Effects of zirconium and strontium on microstructure and properties of nickel aluminium bronze ingot

作　　者：张兵[1] 许晓静[1] 陈树东[1] 蒋伟[1] 

机构地区：[1]江苏大学先进制造与现代装备技术工程研究院,江苏镇江212013

出　　处：《材料热处理学报》2015年第3期62-66,共5页Transactions of Materials and Heat Treatment

基　　金：江苏大学优秀学术青年骨干培养对象基金(1211110001);校企产学研合作项目(1801110288)

摘　　要：借助显微硬度计、光学显微镜、扫描电镜、X射线衍射分析、腐蚀实验和拉伸测试等手段,研究了锆、锶复合微合金化铸态镍铝青铜的硬度、组织、耐蚀性能和力学性能。结果表明:与未微合金化铸态镍铝青铜(Cu-8.87Al-5.22Fe-4.48Ni-1.08Mn-0.53Zn)相比,锆、锶复合微合金化铸态镍铝青铜(Cu-9.86Al-5.84Fe-4.46Ni-1.03Mn-0.6Zn-0.048Zr-0.03Sr)的相组成没有显著变化,都由α相、β相、γ2相和κ相组成。但是微合金化镍铝青铜的α相和κIV相显著细化,共析组织(α相+κIII相)也大幅细化,合金硬度从212.1 HV提高到216 HV。由于腐蚀优先发生在共析区域内,而共析组织的细化降低了其产生连续腐蚀通道的概率,促进了合金的均匀腐蚀性能和电化学腐蚀性能的全面提高(在3.5%Na Cl水溶液中均匀腐蚀速率和电化学腐蚀速率分别降低2.9%和49.6%);晶粒细化和颗粒弥散强化提高了微合金化镍铝青铜的力学性能,其抗拉强度和屈服强度分别提高到676.6 MPa和260.3 MPa(分别提高4.06%和4.07%)。The hardness,microstructure,corrosion resistance,and mechanical properties of a new zirconium and strontium nickel aluminium bronze ingot were investigated by means of micro hardness tester,optical microscope( OM),scanning electron microscopy( SEM),X-ray diffraction analysis,uniform corrosion test,electrochemical corrosion test and tensile testing. The results show that compared with the un-microalloying nickel aluminum bronze ingot( Cu-8. 87Al-5. 22Fe-4. 48Ni-1. 08Mn-0. 53Zn),the microalloying nickel aluminium bronze ingot( Cu-9. 86Al-5. 84Fe-4. 46Ni-1. 03Mn-0. 6Zn-0. 048Zr-0. 03Sr) has no significant change in the phase constituents,which is composed of α-phase,β-phase,γ2-phase and κ-phase. However,the α-phase and κIV-phase of microalloying nickel aluminium bronze significantly are refined,together with eutectoid microstructure( α-phase + κIII-phase) being also greatly refined. The alloy hardness can increase from 212. 1 HV to 216 HV. Corrosion occurs preferentially in eutectoid region,and refinement of the eutectoid microstructure can reduce the probability of generating the continuous corrosion channel. As a result,the microalloying nickel aluminium bronze ingot presents higher uniform corrosion properties and electrochemical corrosion properties( in 3. 5% Na Cl water solution,the uniform corrosion rate and the electrochemical corrosion rate can decrease by 2. 9 and 49. 6 percentage,respectively). Grain refinement and dispersion strengthening can enhance mechanical properties of microalloying nickel aluminum bronze,whose tensile strength and yield strength can increase to 676. 6 MPa and 260. 3 MPa,respectively( increased by 4. 06% and 4. 07%).

关 键 词：镍铝青铜 微合金化 组织 耐腐蚀性能 力学性能 

分 类 号：TG146.11[一般工业技术—材料科学与工程]