Fe含量对Ti80合金显微组织和性能的影响

研究了不同Fe元素含量（0.04%~0.41%，w）对Ti80合金显微组织和性能的影响。结果表明：增加Fe含量，可以提高Ti80合金室温强度。Fe元素含量每增加0.2%，合金强度提高约20 MPa，但对合金塑性与冲击性能无明显影响。Fe元素对合金组织形态有影响，当Fe含量提高至0.41%时，α相由球状转变为长条状。30 d海水腐蚀试验周期内，Fe元素的加入降低了Ti80合金的开路电位，导致合金在天然海水浸泡和5 m/s流速条件下平均腐蚀速率增大，耐海水腐蚀性能有所下降，但与正常Ti80合金仍处于同一数量级。

Effects of Fe Content on the Microstructures and Properties of Ti80 Alloy

The influences of Fe content (between 0.04% and 0.41%, w) on microstructures and properties of Ti80 titanium alloy have been studied. The results show that the increase of Fe content can improve the tensile strength at room temperature of Ti80 titanium alloy. The Fe content increases by 0.2%, the tensile strength increases by about 20 MPa. The increase of Fe content has no significant effect on plasticity and impact properties of the alloys. The Fe element can affect the structural morphology of the alloy. When the Fe content increases to 0.41%, the shape of α phase changes from globularity into long strip. During the 30-day test, the addition of Fe element reduces the open circuit potential of Ti80 alloy and results in the increase of average corrosion rates of the alloy under the conditions of natural seawater immersion and the seawater with a flow rate of 5 m/s. The seawater corrosion resistance of the alloy decreases, but still in the same order of magnitude with that of the normal Ti80 alloy.