王宁涛, 阮士朋, 段路昭, et al. High Temperature Mechanical Properties of 280mm x 325mm Casting Bloom of Alloy Steel SAE8640[J]. Special Steel, 2018, 39(1): 68-70.
王宁涛, 阮士朋, 段路昭, et al. High Temperature Mechanical Properties of 280mm x 325mm Casting Bloom of Alloy Steel SAE8640[J]. Special Steel, 2018, 39(1): 68-70.DOI:
The mechanical properties of steel SAE8640 280mm x 325mm casting bloom (/% : 0.41C
0.20Si
0.80Mn
0.005S
0.014P
0.46Cr
0.43Ni
0.21Mo
0.043All
0.0011O
0.0054N) at 550~1200℃ has been measured by using Gleeble 1500 thermal simulation machine
and the morphology of fracture of tensile specimen is observed by scanning electron microscope. Results show that the steel SAE8640 has obvious 3-brittle zone: I brittle zone >1200℃
II brittle zone 950~1000°C and Ⅲ brittle zone 650~750℃;the reduction of area of steel at 950〜1000°C is 60% and the morphology of tensile fracture is mainly river pattern type fracture
it should be avoid rolling at this temperature range; and the reduction of area of steel at 650~750 °C is ≥65%
the tensile fracture is tough fracture to meet the requirement on plasticity of casting bloom in straightening process.