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Kinetic Model of εCu Particle Dissolution in Welding Induced HAZ of CopperContaining Steel

WANG Qingfeng , CHAI Feng , CAI Jianwei , PAN Tao , SU Hang

钢铁研究学报(英文版)

The kinetics of εCu particle dissolution in the matrix of heat affected zone (HAZ) during welding of a coppercontaining steel was determined by assembling the welding temperaturetime program into a modified Whelan′s solution. The particle dissolution dependence on the degree of “superheating” above the equilibrium transformation is demonstrated from the model. In terms of volume fraction of particle dissolution, the HAZ may be classified into three zones, including the undissolving zone, the partially dissolving zone, and the completely dissolving zone, respectively. The numerical solution was in good agreement with the experimental examination finding. The results of model can be used to quantitatively map the εCu dissolution zone dependence on the peak temperature of welding thermal cycles and understand the evolution of this transformation during welding.

关键词: εCu;particle dissolution;kinetics;welding;steel

Physical Simulation and Experimental Examination of εCu Particles Dissolution Evolution During Welding of Copper Precipitation Strengthening Steel

WANG Qingfeng , SHANG Chengjia , CHEN Dawei , CAI Jianwei , CHEN Weichang

钢铁研究学报(英文版)

The kinetics of εCu particles dissolution in the matrix during welding of a copperprecipitation strengthening steel was determined by a combination of GleebleTM physical simulation, TEM examination and hardness measurement. The εCu particles underwent a coarsening and part dissolution and then complete dissolution reaction as the peak temperature increased from 750 to 1 000 ℃, which resulted in the decrease in the number density of εCu particles and hardness in the heataffected zone (HAZ). The results can be used to understand the evolution of this transformation and a softening behavior of the HAZ during welding of this type of steel.

关键词: εCu particle dissolution;hardness;kinetics;steel;welding;physical simulation

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