退火工艺对ZCuAl9Fe4Ni4Mn2镍铝青铜组织与力学性能的影响

Effects of Annealing Process on Microstructure and Mechanical Properties of ZCuAl9Fe4Ni4Mn2 Nickel Aluminum Bronze

通过采用金相显微镜（OM）、扫描电镜（SEM）、常温拉伸试验等分析手段,研究了退火温度对船舶推进器用ZCuAl9Fe4Ni4Mn2镍铝青铜组织与性能的影响。研究表明：镍铝青铜铸态组织由基体α相及大小不同、形态各异的金属间化合物（Fe,Ni）Al相组成,部分（Fe,Ni）Al相较为粗大。随着退火温度的升高,组织中粗大金属间化合物逐渐减少,组织得到细化。经980℃保温2h,随炉冷却到580℃,然后出炉空冷的退火工艺,镍铝青铜抗拉强度从铸态的487MPa提高到621MPa,伸长率从16.82%提高到17.83%。

By means of metallographic microscope（OM）, scanning electron microscope（SEM） and tensile test at room temperature, the effects of annealing temperature on the microstructure and properties of ZCuAl9Fe4Ni4Mn2Ni-Al bronze for marine propeller were studied. The research shows that, the cast microstructure of Ni-Al bronze consists of the matrix of alpha phase and intermetallic compounds（Fe, Ni）Al phase with different sizes. Partial（Fe, Ni） Al phase is coarse. With the increase of annealing temperature, the coarse intermetallic compounds in the microstructure gradually decreases, and the microstructure is refined. After holding at 980 ℃ for 2 h, cooling to 580 ℃ in furnace and then air cooling, the tensile strength of Ni-Al bronze increases from 487 MPa to 621 MPa, the elongation increases from 16.82% to 17.83%, and the elongation increases from 16.82% to 17.83%.