Experimental Study on Fracture Toughness of Q460C the High-Strength Construction Steel at Low Temperature
Three point bending tests were carried out on 14mm-thick Q460C the high-strength structural steel at low temperature, and scanning electronic microscope of the fracture appearance was analyzed. The results showed that the obvious feature of brittle mechanism was shown on the three point bending specimen fracture whose testing took place at -40°C. And the crack tip opening displacement value of Q460C steel, which was less than that of Q235 steel, Q345 steel and Q390 steel at low temperature, tended to decrease with respect to the temperature reduction. Moreover, a Boltzmann function fitting analysis was applied to the experimental data, and the ductile-brittle transition temperature and the changing regularity were obtained.
Dongye Sun, Wen-Pei Sung and Ran Chen
Y. Q. Wang et al., "Experimental Study on Fracture Toughness of Q460C the High-Strength Construction Steel at Low Temperature", Applied Mechanics and Materials, Vols. 71-78, pp. 890-897, 2011