摘要
对X100管线钢母材及模拟焊缝热影响区(HAZ)的显微组织环境致裂(EAC)敏感性进行了研究分析,在75℃温度下的1%NaHCO3+0.5%NaCO3溶液中进行慢应变速率试验,试验电位为-500^-1 100 mV,对比得到X100管线钢与模拟焊缝热影响区显微组织的敏感性。结果表明,热处理影响管线钢对环境致裂的抵抗力。阳极电位的应力腐蚀开裂是晶间开裂,当靠近-890 mV的自然腐蚀电位时变为穿晶开裂。晶间应力腐蚀开裂比穿晶应力腐蚀开裂发生的电位偏向阳极,阴极电位穿晶氢脆的增长率高达1.4×10-5mm/s,二次开裂较少。
Susceptibility of as-received grade XI00 steel was compared to that of simulated and seam-weld heat-affected zone microstnwtures by slow strain rate testing in a sodium hydrogen carbonate-sodium carbonate solution at 75℃ over a potential range of -500 to -1 110 mV vs. standard calomel electrode （sce）. Heat treatment has an effect on the resistance of the steel to environment-assisted cracking. Stress c, on＇osion cracking at anodic potentials was intergranular （IG）and became transgranular （TG） as tile free corrosion potential of -890 mV （sce） was approached. At eathodic potentials, transgranular hydrogen embrittlement occurred with faster growth rates up to 1.4×10^-5 mm/s and less secondary cracking.
出处
《焊管》
2013年第11期71-74,共4页
Welded Pipe and Tube
关键词
管线钢
低合金钢
恒电位
应变效果
应力腐蚀
氢脆
pipeline steel
low alloy steel
constant potentials
strain effect
stress corrosion
hydrogen embrittlement
