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EFFECT OF MECHANICAL FACTORS ON SCC BEHAVIOUR OF WELTEN 60 PIPELINE STEEL |
LI Xiaodong;CHEN Liangshi Corrosion Science Laboratory; Institute of Corrosion and Protection of Metals; Academia Sinica |
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Cite this article:
LI Xiaodong;CHEN Liangshi Corrosion Science Laboratory; Institute of Corrosion and Protection of Metals; Academia Sinica. EFFECT OF MECHANICAL FACTORS ON SCC BEHAVIOUR OF WELTEN 60 PIPELINE STEEL. Acta Metall Sin, 1993, 29(2): 78-82.
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Abstract SCC behaviour of Welten 60 pipeline steel in Na_2CO_3 / NaHCO_3 solutionat 80℃ and -670mV(SCE) have been investigated by means of slow strain rate tests, low fre-quency and fluctuating stress tests, metallographic examination and SEM observation. It wasfound that cracking mode was intergranular, and that threshold stresses obtained by using ta-pered cylindrical tension specimen decreased with decreasing strain rate and fluctuating fre-quency. The data obtained by using single notched plate specimens showed that the greatestcracking velocity(da/dt) is about 3.5×10~(-6)mm/s and the critical stress intensityfactor(K_(ISCC) to SCC is about 32MPam~(1/2).
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Received: 18 February 1993
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1 Parkins R N. Mater English Appl, 1978; 1: 80 2 Parkins R N, Fessler R R. Corrosion'86 Symposium on Environmental Cracking, NACE, Houston, Texas, 1986: 8 3 Beavers J A, Parkins R N. Corrosion'86 Symposium on Environmental Cracking, NACE. Houston, Texas, 1986: 30 4 Yu J, Holryd N J H, Parkins R N. ASTM STP 821, 1982: 288 5 Hallidsy M D, Beevers C J. The Measurement of Crack Length and Shape During Fracture and Fatigue, Engineering Materials Advisory Services Ltd, West Midland, UK, 1982: 85 6 Parkins R N. ASTM STP 655, 1979: 5 7 Parkins R N, Greenwell B S. Metallurgical, 1976; 25: 51 |
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