Ductile to brittle failure transition of HSLA-100 Steel at high strain rates and subzero temperatures

摘要: Abstract Mechanical properties of HSLA-100 steel at room and subzero temperatures −40 °C, −80 °C −196 °C were investigated in this work. Dry ice liquid nitrogen used to reach the low temperatures. Also, material response different strain rates was studied. Quasi-static tensile test rig Hopkinson split bar employed carry out experiments. Furthermore, fracture behavior transient temperature using curve stress triaxiality factor ( P / Y ) against true e f Bridgman equation. In addition, mechanisms for testing conditions Finally, SEM observations performed back results found research. The indicated that −40 °C quite ductile regardless rate level. Fracture mechanism transition from brittle occurred −80 °C. For −196 °C, completely high entirely lower rates. It also yield progressively increased with decrease increase rate. maximum 160% 10,800 s −1 .