NUMERICAL SIMULATION OF STRESS-STRAIN IN CASTING STEEL DURING SOLIDIFICATION AND FORMATION MECHANISM OF HOT-TEARING
铸钢件准固态区域应力,应变数值模拟及热裂机制

As regard to several cases of real hot tearing ZG45 bars (C 0.42%-0.52%,Mn 0.5%- 0.8%, Si 0.2%- 0.45%), numerical simulation of stress-strain during solidification was conducted. The formation mechanism of hot tearing was discussed, and the conclusion is drawn that hot tearing originates from Bingham body and is caused when strain of Bingham body being over preserved plastic strain. The simulated results show that relative hot spot gives rise to increase in concentration strain of Bingham body, and that case of proper chilI could effectively decrease concentration strain of Bingham body, uponthere to reduce possibility of hot tearing.