Abstract
Abstract The hot deformation behavior of as-cast 9Cr3W3Co oxide dispersion-strengthened (ODS) steel was investigated by Gleeble 3500 facility in the temperature range of 900–1,150℃ and at strain rates range of 0.01–10 s−1. The constitutive equation and processing maps were established to describe this complex hot deformation process. The true stress–strain curves showed that the softening effects of dynamic recovery and dynamic recrystallization are stronger than the effect of work hardening with further increasing the temperature and strain. The optimal hot working parameters of 9Cr3W3Co-ODS steel are suggested to be T = 1,050–1,100°C and ε ̇ \dot{\varepsilon } = 0.03–0.3 s−1.
Highlights
The 9Cr3W3Co steel is well-known as one of the best materials with long service life under high pressure and temperature owing to their unique characteristics, such as high thermal conductivity, low thermal expansion coefficient, and so on [1,2]
Davenport et al [4] employed a constitutive equation for modeling the forming processes of plain steel and microalloyed steel, which was distinguished from the traditional phenomenological constitutive models that were established by numerical statistics and neglected the physical meaning [5]
Based on the above models, Ebrahimi et al [6] studied the microstructure evolution of heat-resistant steel (13% Cr) during hot deformation
Summary
The 9Cr3W3Co steel is well-known as one of the best materials with long service life under high pressure and temperature owing to their unique characteristics, such as high thermal conductivity, low thermal expansion coefficient, and so on [1,2]. Based on the above models, Ebrahimi et al [6] studied the microstructure evolution of heat-resistant steel (13% Cr) during hot deformation. For 9Cr-ODS steel, Shao et al have combined constitutive equation and processing maps to comprehensively describe the flow behaviors of 9Cr-ODS heat-resistant steel and obtained satisfactory results [8]. The abovementioned 9Cr-ODS was produced by mechanical alloying and hot isostatic pressing, which were different from the traditional production process (i.e., vacuum induction melting). There have been no reports on the study of hot deformation behaviors of 9Cr3W3Co-ODS steels with the traditional production process. The flow stress behavior of a 9Cr3W3CoODS steel were analyzed by isothermal compression tests with different processing parameters. Theoretical models were carried to understand the hot deformation behaviors. The microstructure evolution were studied in detail under the different hot working parameters
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