摘要
测试X80管线钢分别在未腐蚀状态下及饱和H2S预腐蚀后的δ-Δa阻力曲线;分析了H2S腐蚀对其裂纹扩展阻力曲线、断裂韧性、塑性功等方面影响。结果表明,H2S腐蚀后X80材料KIC下限为75.43 MPa·m?。对比分析H2S腐蚀前后测试结果,发现H2S腐蚀会对X80钢的断裂韧性产生显著影响:未腐蚀试样的裂纹扩展阻力曲线明显高于H2S腐蚀后的;H2S腐蚀前后材料的稳定裂纹扩展下的启裂韧度δ0.2BL分别为0.740 mm和0.365 mm,前者是后者的2.02倍;扩展量Δa相近的情况下,未腐蚀试样的裂纹扩展过程所需塑性功是H2S预腐蚀后的2.29倍左右,H2S腐蚀明显会降低X80材料的断裂韧度。因此,管道在输送天然气过程中应尽量避免H2S的腐蚀,保证材料的韧性不受破坏。
Fracture toughness of X80 pipeline steel in a simulated petrochemical environment is studied in this paper. Original specimens and saturated H2 S pre-corroded specimens were tested respectively and δ-Δa resistance curves were obtained, while the influence of hydrogen sulfide corrosive environment on the resistance curve, fracture toughness and plastic work of X80 pipeline steel was analyzed. It follows that the lower limit of KICof the pre-corroded X80 steel is 75.43 MPa·m1/2, and the hydrogen sulfide corrosion affect significantly on the fracture toughness of X80 steel： the crack growth resistance curve obtained from original specimens is much higher than that of the pre-corroded specimens; the fracture toughness of stable crack propagation δ0.2BLis 0.740 mm and 0.365 mm respectively, and the former is 2.02 times of the latter. In case for a given amount of crack propagation Δa, the plastic work of the original specimen is about 2.29 times of the pre- corroded specimen. Hydrogen sulfide corrosion reduced the fracture toughness of the X80 steel remarkablely. Thus, in the course of natural gas pipeline, hydrogen sulfide corrosive environment should be avoided to keep the steel a proper high toughness to prevent damage.
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2016年第3期179-185,共7页
Chinese Journal of Materials Research
基金
国家自然科学基金青年基金资助项目11302007~~
关键词
金属材料
断裂韧性
阻力曲线
H2S腐蚀
metallic materials
fracture toughness
resistance curve
hydrogen sulfide corrosion
