Microstructure and Properties Forecast of Heat Affected Zone(HAZ)of a Typical High-strength Low Alloy Bainite Steel
The microstructure transformation of heat affected zone(HAZ)of a typical high-strength low alloy bainite steel plate was simulated by finite element simulation(FEM)in this study,and the ratio of different types of metallurgical structures were obtained by the model,and the hardness distribution of HAZ is predicted,to determine the cold cracking tendency of HAZ.Firstly,the SH-CCT curve of the test steel was measured by Gleeb tester,and the microstructure under different cooling conditions of t8/5 was obtained.Then,the temperature field and its changes with time of the HAZ during the welding process was modeled by SYSWELD,and the coupling of the thermal history of different positions and the phase transformation model revised by the SH-CCT curve was established to obtain the distribution of the microstructure.At the same time,the modified nonlinear equation method is used to digitize the hardenability curve of steel,which is used to predict the hardness distribution of coarse grained heat affected zone(CGHAZ).Compared with the numerical simulation and the actual measurement of welded joint of submerge-arc welding(SAW),it was found that the simulation results can basically reflect the distribution of CGHAZ,but the hardness calculation values were slightly higher than the actual measured value.The analysis show that the systematic deviation was caused by combined action of peak temperature,grain size and solution of alloy elements in the location of CGHAZ.Since the measured value is lower than the predicted value,and it is safe for the welded joint under the condition of the system deviation.
high-strength low alloy steel heat affected zone (HAZ) SH-CCT curve Phase transformation model numerical simulation performance prediction
ZOU Yang LIU Jinhui ZHANG Xi LIU Guoquan
State Key Laboratory of Advanced Metals and Materials,University of Science and Technology Beijing,B State Key Laboratory of Advanced Metals and Materials,University of Science and Technology Beijing,B Shougang Research Institute of Technology,Shougang Group,Beijing 100043,China;Beijing Engineering Re
国际会议
STEELSIM2017(第七届冶金过程及钢铁材料模拟及仿真国际会议)
青岛
英文
424-428
2017-08-16（万方平台首次上网日期，不代表论文的发表时间）