Abstract
Effect of Post-Welding Heat Treatment (PWHT) on properties of 485MPa tensile strength vessel steel was studied by changing carbon contents and parameters of heat treatment. The conclusions are: The strengths of vessel steel decrease after PWHT. And the amounts of strength reduction increase with the carbon contents rising. To get the tensile strength≥485MPa vessel plates, of given Mn content 1.45%, the carbon content is designed over 0.17% in case of 900°C normalization, over 0.20% in case of 620°C holding temperature in 2 hours, over 0.23% in case of 620° holding temperature in 2 hours by 3 times, and over 0.20% in case of 620° holding temperature in 6 hours. The impact toughness are decreased by PWHT at all carbon contents. The SEM images of morphology of microstructure are studied to research on mechanism of strength reduction by PWHT. Then it's found that the pearlites are broken and cementite phases precipitate along grain boundary along with the process of PWHT, which brings about a reduction of strength.
Highlights
Post-Welding Heat Treatment (PWHT) is a heat treatment method in order to improve the mechanical property and structure and relief the residual stress of welding joint, which is kind of stress relief annealing
An amount of reports had been published about the research on effect on mechanical property of PWHT through simulating method in Lab [1]-[6].But it is rarely reported that effect of PWHT on properties of vessel steel with various carbon content and many times recycles
The yield strengths increase with carbon contents rising
Summary
Post-Welding Heat Treatment (PWHT) is a heat treatment method in order to improve the mechanical property and structure and relief the residual stress of welding joint, which is kind of stress relief annealing. A part or component is heated to a special temperature with a special heating rate and maintained to be a fixed time and cooled in furnace with very low cooling rate. An amount of reports had been published about the research on effect on mechanical property of PWHT through simulating method in Lab [1]-[6].But it is rarely reported that effect of PWHT on properties of vessel steel with various carbon content and many times recycles. Based on 485MPa tensile strength vessel steel, effect of carbon contents and thermal recycles times on properties is studied to research on mechanism of strength reduction by PWHT
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