Hot Deformation Constitutive Analysis of a Novel Ni-Cr-Mo-B Steel with High Hardenability
GAO Zhiyu1, SHENG Kai1, KANG Yu1, ZHANG Xu1, PAN Tao2
1 College of Materials Science and Engineering, Liaoning Technical University, Fuxin 123099; 2 Division of Engineering Steel, Central Iron and Steel Research Institute, Beijing 100081
Abstract: Hot deformation behavior of a novel Ni-Cr-Mo-B ultra-heavy plate steel with high hardenability at 850-1 150 ℃ and the strain rates of 0.01 to 10 s-1 was studied by means of single pass Gleeble hot compression tests, optical microscopy and regression method. The results revealed that the rheological stress of Ni-Cr-Mo-B steel decreased with the increasing deformation temperature and increased with the rising strain rate du-ring hot compression. The classic strain-compensation Arrhenius-type constitutive equation established in this study could roughly predict the rheological behavior of Ni-Cr-Mo-B steel. Furthermore, a revised strain-compensation Arrhenius-type constitutive equation was proposed by taking the influence of strain rate and deformation heat on the deformation process into consideration. The statistical parameters of the revised equation were as follow, Rc=0.994 68, AARE=3.69%, RMSE=6.44 MPa, NMBE=1.25%, -10%≤δ≤10%, which means that the revised equation could predict the rheological stress more accurately.
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2019, Vol. 33 
