In-service property prediction of X80 self-shielded flux-cored (FCAW) girth weld metal based on strain ageing kinetics

Abstract

ABSTRACT In order to achieve in-service safety evaluation of girth weld, property prediction of X80 self-shielded flux-cored girth weld metal based on strain ageing kinetics was conducted. Strength increment (ΔY) and toughness reduction (ΔCVN) relationship was obtained through tensile and Charpy impact test using specimens before and after strain ageing. 1% prestrain was conducted and then aged at different conditions (150°C/100°C for 1–6 h, 80°C/50°C for 1–120 days). Strain ageing kinetics was investigated based on experiment results, and diffusion activation energy (Q) was calculated as 88.1 kJ/mol. The correlation equation of ageing temperature and period was obtained: , T 1

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基于应变时效动力学的X80自屏蔽药芯环焊缝在役性能预测

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