摘要
本文采用单边缺口试样，原位研究了Ａ５３７结构钢在３．５％ＮａＣｌ水溶液中，－１４００ｍＶ（ＳＣＥ）电位下阴极充氢６小时前后，疲劳裂纹自由面张开位移和裂尖表面应变场的变化．同时还对充氢与未充氢条件下光滑圆柱试样的应力应变行为进行了对比研究，用扫描电镜观察了疲劳断口形貌．结果表明：由于氢的进入，疲劳裂尖材料变形困难，从而导致了裂尖塑性区尺寸与裂纹相对张开位移的减少．
The effect of hydrogen on the strain distribution at crack tip and the relative crackopening displacement has been studied in situ by the laser speckle interferometery (SPI) forsingle-edge notched plate specimens of A537 steel under the condition of 6h hydrogen charging in3.5% NaCl solution at a potential of-1400mV(SCE). The stress-strain behaviour for the smooth specimens with and without hydrogen charging has been compared and the fatigue fracturemorphology has been examined. The experiment results showed that the presence of hydrogen incrack-tip material resulted in a decrease of both plastic zone size and the relative crack--openingdisplacement.
出处
《腐蚀科学与防护技术》
CAS
CSCD
1995年第2期140-145,共6页
Corrosion Science and Protection Technology
基金
国家自然科学基金
关键词
应变场
阴极充氢
裂纹尖端
变形
结构钢
crack tip deformation, strain distribution, crack tip opening displacement,hydrogen charging
