静水压力对铸造与锻造Ti-6Al-4V合金应力腐蚀的影响差异研究

徐秋发, 郭岳, 刘骏, 杨东, 崔宇

Effect of Hydrostatic Pressure on Stress Corrosion Cracking of Cast and Forged Ti-6Al-4V Alloys

XU Qiufa, GUO Yue, LIU Jun, YANG Dong, CUI Yu

表1 U弯铸态Ti-6Al-4V合金试样在不同静水压力下的EIS的拟合结果

Table 1 Fitting results of EIS of U-bend cast Ti-6Al-4V alloy samples under different hydrostatic pressures

Pressure / MPa t / min Rs / Ω·cm2 Ceff, dl / μF·cm-2 ndl Rct / Ω·cm2 Ceff, f / μF·cm-2 nf Rf / Ω·cm2 Σχ2 0.1 5 1.52 51.7 0.75 1388 70.5 0.90 1.85 × 105 4.06 × 10-3 25 1.49 41.9 0.77 1254 72.6 0.89 3.75 × 105 4.16 × 10-3 45 1.49 38.1 0.78 2675 75.4 0.88 5.08 × 105 1.74 × 10-3 65 1.50 35.5 0.79 2675 76.0 0.88 6.20 × 105 2.76 × 10-3 85 1.43 32.7 0.78 3578 67.1 0.90 5.62 × 105 6.40 × 10-3 10 5 1.61 41.3 0.94 1074 65.1 0.88 9.50 × 104 6.56 × 10-3 25 1.63 32.6 0.99 1293 67.0 0.87 2.74 × 105 4.71 × 10-3 45 1.63 32.0 0.95 1132 70.6 0.87 3.61 × 105 8.33 × 10-3 65 1.60 32.3 0.95 1278 73.1 0.86 3.85 × 105 8.41 × 10-3 85 1.61 28.6 0.93 1502 74.0 0.88 3.98 × 105 9.05 × 10-3 20 5 1.66 23.4 0.89 106 24.8 0.85 5.54 × 104 4.18 × 10-3 25 1.57 35.8 0.95 52 23.3 0.83 5.58 × 104 8.49 × 10-3 45 1.61 20.4 0.98 67 20.1 0.85 3.51 × 104 2.87 × 10-3 65 1.58 20.1 0.98 72 19.9 0.85 3.48 × 104 6.62 × 10-3 85 1.61 15.9 0.91 125 18.7 0.87 3.32 × 104 7.71 × 10-3