Effect of deformation temperature on the ductile–brittle transition behavior of a modified 9Cr–1Mo steel

A modified 9Cr–1Mo steel received in normalized and tempered condition has been subjected to four different hot-rolling treatments at different rolling temperatures (1050 °C, 1000 °C, 950 °C and 875 °C) applying a constant true strain of ~0.7. The rolled plates were tempered and tested for tensile and Charpy impact properties following standard procedures. Hot-rolling increased the strength by more than 100 MPa, but reduced the ductility of the...