王振国, 任勇, 程晓茹, et al. Math Model for Deformation Resistance of Steel Q345B at Low Temperature and Its Application in Straightening Process[J]. Special Steel, 2012, 33(2): 33-36.
王振国, 任勇, 程晓茹, et al. Math Model for Deformation Resistance of Steel Q345B at Low Temperature and Its Application in Straightening Process[J]. Special Steel, 2012, 33(2): 33-36.DOI:
The hot tensile test of Φ10 mm x 30 mm cylinder specimen of low alloy steel Q345B with true strain 0.15 and strain rate 0.001-0.1 s
-1
at 450-650 ℃ has been carried out by Gleeble-1500 thermal test machine. Results show that with low strain rate at lower temperature the deformation resistance is at elastic-piastic deformation stage and its linear section is longer
and as deformation is larger than 0. 06
the apparent plastic deformation of steel occurs and the change rule of deformation resistance is basically similar to that at higher temperature. Based on test data the math model for deformation resistance of steel Q345B is established by using Origin software with multivariate nonlinear regression. The straightening force of 9 rolls straightener for medium and heavy plate is calculated by using this model combined with straightening theoretical equation
the relative error of calculated results are 0.01%-6.17% .