Effect of PWHT on properties of 485MPa tensile strength vessel steel
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℃ normalization,over 0.20%in case of 620℃ 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 its 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.
Zhao Xinyu Zou Yang Qin Liye Liu Yang
Plate Technology,Shougang Research Institute of Technology,100083 Beijing,China;Beijing key Laboratory of Green Recyclable Process for Iron & steel Production Technology,100083 Beijing,China
国际会议
广州
英文
1-4
2018-05-11（万方平台首次上网日期，不代表论文的发表时间）