Abstract
Tianqi Wang, Liangyu Li, Xiao Li & Xu Yang Tianjin Key Laboratory of Advanced Mechatronics Equipment Technology Tianjin 300160, China E-mail: wtq0622@163.com Abstract The grain size in heat affected zone (HAZ) of welding piece is an important element for evaluating the welding quality. The Monte Carlo (MC) technique, a stochastic simulation method, could be applied to simulate the microstructure in HAZ. A finite element model (FEM) was employed to simulate the GMAW temperature field and the data of the thermal cycle were used to combine with the MC numerically model to calculate the grain size in different welding heat input. Then mathematics model of the grain growth could be worked out by both the kinetic model and the MC model. The dynamic process was simulated by the result of the simulation. The experimental result was used to prove the validity of this method in simulating of microstructure.
Highlights
The grain size in heat affected zone (HAZ) is a very important characteristic for evaluating the properties of the welding piece
In welding process the heating and cooling of work piece are un-uniform and the welding parameters play an important role in the control of microstructure, so the research of grain growth during the different heat input are important
Wei et al established a simulation of grain growth, used the 2-D Monte Carlo (MC) model and the relationship between the Monte Carlo step (MCS) and the grain size in ferritic steel are obtained
Summary
The grain size in HAZ is a very important characteristic for evaluating the properties of the welding piece. In welding process the heating and cooling of work piece are un-uniform and the welding parameters play an important role in the control of microstructure, so the research of grain growth during the different heat input are important. Wei et al established a simulation of grain growth, used the 2-D MC model and the relationship between the MCS and the grain size in ferritic steel are obtained. Shi et al simulated the Austenite grain growth of the weld joints for the ultra fine grain reinforcement steel bar, in the simulation the heat pinning effect of temperature is considered. Wei et al used three MC methods to simulate the grain growth in HAZ of stainless steel sus[316]. The two analytical solutions are used to study the relationship between different heat input and microstructure in HAZ. Many experiments are performed to evaluate the availability of the method
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