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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。
The susceptibility to environmental corrosion cracking (EAC) of X100 pipeline steel base metal and simulated weld HAZ was investigated and analyzed. The sensitivity of the HAZ solution to slowing down was investigated in a solution of 1% NaHCO3 + 0.5% NaCO3 at 75 ℃ Strain rate test, the test potential -500 ~ -1 100 mV, compared to X100 pipeline steel and simulated weld HAZ microstructure sensitivity. The results show that heat treatment affects the resistance of pipeline steel to environmental cracking. Stress corrosion cracking at the anode potential is intergranular cracking, transgranular cracking when approached to a natural corrosion potential of -890 mV. The intergranular stress corrosion cracking is more positive than that of transgranular stress corrosion cracking. The growth rate of cathodic potential transversal hydrogen embrittlement is as high as 1.4 × 10-5mm / s, and the secondary cracking is less.