Effect on property of HIC-Resistance of vessel steel of PWHT

2017 3rd International Conference on Applied Materials and Manufacturing Technology

Zhao, Xinyu^1,2 ; Zou, Yang^1,2 ; Qin, Liye^1,2 ; Lv, Yanchun^1,2

Plate Technology Department, Shougang Research Institute of Technology, Beijing

100043, China^1

Beijing Engineering Research Center of Energy Steel, Beijing

100043, China^2

关键词: Ductile-brittle transition temperature;    Hydrogen-induced cracking;    Impact energy;    Morphology structures;    Post-welding heat treatments;    Resistance properties;    Vessel steel;    Welding and joining;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/242/1/012054/pdf
DOI  :  10.1088/1757-899X/242/1/012054

来源: IOP

【 摘 要 】

Post-Welding Heat Treatment (PWHT) is usually taken after welding and joining of vessel steel, which effects the mechanical and Hydrogen Induced Cracking (HIC) resistance property of vessel plates. Simulating PWHT experiment was taken to research on the effect on mechanical property and HIC-resistance of PWHT of vessel plates. Some conclusions can be summarized as following. Comparing with the normalizing samples, the tensile strength of the samples after PWHT with holding time of 2h, 6h and 20h decreases by 27MPa, 44MPa and 47MPa. Ductile Brittle Transition Temperature (DBTT) of the normalizing samples was almost close to those of the samples after PWHT. But the impact energy of samples at 0°C increased with rise of PWHT holding time. And the hardness of samples decreases with rise of PWHT holding time. As shown in morphology structure, the precipitation of carbonide increases with the rise of holding time of PWHT, which decreases the strength and hardness of samples and raises the impact energy. But PWHT has a little effect on HIC-Resistance, which means PWHT don't deteriorate property of HIC-Resistance of vessel plates severely.