Inferring the temperature dependence of Beremin cleavage model parameters from the Master Curve

The temperature dependence of Beremin model parameters in the ductile-to-brittle transition region was addressed by employing the Master Curve. Monte Carlo simulation was performed to produce a large number of 1T fracture toughness data randomly drawn from the scatter band at a temperature of interest and thus to determine Beremin model parameters. In terms of the experimental data of a C–Mn steel (the 16MnR steel in China), results revealed that the Weibull modulus, m, decreases with temperature over the lower transition range and remains a constant in the lower-to-mid transition region. The Weibull scale parameter, σu, increases with temperature over the temperature range of investigated. A small sample may lead to a considerable uncertainty in estimates of the Weibull stress parameters. However, no significant difference was observed for the average of Weibull stress parameters from different sample sizes.

Research highlights▶ Temperature dependence of Beremin model parameters is inferred by Master Curve approach. ▶ Weibull modulus decreases while Weibull stress scale parameter increases with increasing the temperature. ▶ Estimation of Weibull stress parameters in terms of small amounts of specimens leads to a considerable uncertainty.