【摘要】 通过减小小锥度圆锥形拉伸试样的半锥角（θ=1.5°）,成功地运用慢应变速率技术测定了国产17-4PH钢在80℃,3.5%NaCl水溶液中氢脆型应力腐蚀开裂的裂纹萌生应力值σ（?）,并用恒载荷试验法进行了验证。结果表明,在上述试验条件下,当应变速率ε=3.04×10^-6/s、外加电位E=-1000 mV（SCE）时,17-4PH钢的σ（?）=700MPa。文中还对半锥角的改小进行了讨论。更多还原

【Abstract】 Using slow strain rate technique, by reducing half cone angle （θ=1.5°） of small tapered cylindroconical tensile specimen, the initial stress value （σ_i） of stress corrosion cracking incluced by the hydrogen embrittlement was successfully determined for the 17-4pH steel in 3.5% Nacl aqueous solution at 80℃.The experimentally obtained σ_i was checked by constant load testing method. The ercperiment result showed that under the strain rate of 3.04×10^-6/s and potential of -1000mV （SCE） the initial stress value σ_i for 17-4PH steel was found to be 700MPa. In this paper the effect of reducing the half cone angle of STC specimens on the experimental results was also discussed.更多还原