Effects of strain rate and temperature on tensile deformation and fracture behaviour of forged thick section 9Cr-1Mo ferritic steel

Tension tests have been conducted to evaluate the influence of strain rate (6.3 × 10−3 to 3.2 × 10−5 s−1) and temperature (300–873 K) on tensile deformation and fracture behaviour of 1000 mm diameter and 300 mm thick 9Cr-1Mo tube plate forging in simulated post weld heat treatment condition. Yield strength and ultimate tensile strength decreased gradually up to around 723 K. Beyond 723 K a rapid fall in both the strength values was observed. In...