Abstract
Isothermal compression tests of BSTMUF601 super-alloy in the temperature range of 950 °C–1200 °C and at the strain rates of 0.2 s−1, 5 s−1, 10 s−1 were performed on a Gleeble-1500D thermo-mechanical simulator. Based on the hyperbolic sine function, the unified constitutive equations and hot processing maps during the hot deformation process were established. The flow stress predicted by the constitutive equations shows good agreement with the corrected stress. Hot processing maps for hot working conditions were established based on exploring the effect of power dissipation efficiency and the instability coefficient associated with various kinds of temperatures and stain rates. Subsequently, power dissipation efficiency and the instability coefficient were interpreted based on hot processing maps under a series of strains, temperatures and strain rates. The results show that power dissipation efficiency increases gradually with the increasing temperature and the decreasing stain rate, and instability domains reduce first, then increase with the increase of true strain. The optimum hot working condition of BSTMUF601 super-alloy was obtained.
Highlights
The nickel-based super-alloy used for the muffle furnace should provide good mechanical properties, oxidation resistance and especially excellent, high temperature, creep-resistant performance [1]
The objective of this paper is to study the hot deformation behavior of BSMUF601 super-alloy based on the results of isothermal compression tests
The flow stress is sensitively dependent on both the deformation temperature and strain rate
Summary
The nickel-based super-alloy used for the muffle furnace should provide good mechanical properties, oxidation resistance and especially excellent, high temperature, creep-resistant performance [1]. The BSTMUF601 super-alloy is a nickel-based super-alloy developed independently by Baosteel and applied to produce plates for muffle furnaces, and it possesses great elevated temperature performance at a less expensive cost. Under the working condition, when the temperature is 1095 ̋ C and stress is 12.4 MPa, the steady creep rate of BSTMUF601 super-alloy is 10 ́6 s1 , which is close to that of Inconel601 super-alloy. BSTMUF601 super-alloy has excellent welding performance, and high temperature strength of the welded joints is 100 MPa under 950 ̋ C and the room temperature strength is 630 MPa. In the past years, research on the BSTMUF601 super-alloy was mainly focused on creep properties and oxidation behavior [2,3]. Based on the processing map, the deformation mechanisms under different deformation conditions can be Metals 2016, 6, 70; doi:10.3390/met6030070 www.mdpi.com/journal/metals
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