Dynamic recrystallization grain size
WebJan 27, 2024 · In this paper, the powder metallurgy (P/M) Ni-based superalloy FGH4096 with an incomplete dynamic recrystallization structure was treated by a solution treatment at different temperatures, cooling methods, and holding times. The size, morphology, and distribution of grains and γ′ precipitates were characterized by an optical microscope … WebMar 13, 2024 · Dynamic recrystallization occurs at temperature 540°C and different strain rates from photographs, average grain size of recrystallized grains decreases with the increase of strain rate. It is also conducted that the gains are relatively small under the conditions of high Z.
Dynamic recrystallization grain size
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WebMar 21, 2024 · Grain size in forgings is the direct consequence of the recrystallization and grain growth kinetics which are addressed in this paper at high temperatures, above the solvus temperature of γ′ and η/δ phases. ... Dynamic recrystallization appears to be limited, with only 30 pct recrystallized at quite high strain of 1.7 applied at 1050 °C ... WebOf particular importance is dynamic recrystallization (DRX) resulting in the desired grain size directly during plastic deformation [11,12,13,14,15]. The main regularities of DRX have been fairly clarified in a number of papers [16,17,18,19,20]. The DRX grain size decreases with a decrease in deformation temperature and/or an increase in strain ...
WebWhile not attempting to be a review of palaeopiezometers, this chapter will present evidence for a ‘universal relation’ between deformation stress and the steady-state recrystallized grain size resulting from stress-induced … Webic recrystallization (DDRX), continuous dynamic recrystallization (CDRX) and geometric dynamic recrystalliza-tion (GDRX). The terminologies used in this field are summarized, together with the key factors influencing the DRX processes including stacking fault energy, initial grain size, TMP conditions and second-phase particles.
WebNov 7, 2024 · The superplastic deformation of a hot-extruded GH4151 billet was investigated by means of tensile tests with the strain rates of 10−4 s−1, 5 × 10−4 s−1 and 10−3 s−1 and at temperatures at 1060 °C, 1080 °C and 1100 °C. The superplastic deformation of the GH4151 … WebMar 28, 2024 · As dynamic recrystallization is ubiquitous in shear zones, any porosity produced as a consequence could play an important role in large-scale shear zone processes. Here we revisit confined experiments …
WebNov 26, 2024 · Further, the grain size and the proportion of low-angle grain boundaries decreased with decreasing welding speed, because of the increasing degree of dynamic …
WebFeb 1, 2014 · The average grain size at a given shear strain (γ) is obtained by adding the size of the deformed ( D j Def) and recrystallized ( D k Rex) grains over the total number of grains N: (4) D ‾ = ∑ i = 1 N D i N = 1 N ∑ j = 1 N 0 D j Def + ∑ k = N 0 + 1 N D k Rex, where N0 is the number of deformed grains prior to recrystallization. optiq sbe specificationsWebFeb 1, 2014 · Grain size behaviour during discontinuous dynamic recrystallization in alloys is characterized by a theoretical approach that combines a novel … porto\\u0027s west covina orderWeb双语使用场景. The dynamic recrystallization grain size has power law relation with Z parameter.───结晶晶粒尺寸和Z参数呈幂律关系。. The metal can be forged hot (above recrystallization temperatures) or cold.───金属既可热锻(高于再结晶温度)也可冷锻。. This structure is altered during forging by subsequent processes of plastic deformation and ... optiray 320 shortageWebApr 12, 2024 · For metallic materials, m and v * change with intrinsic (such as crystal structure [4] and grain size [5]) as well as extrinsic influences ... Recently, nanotwinning-assisted dynamic recrystallization was reported for copper deformed under extreme strain rates [39]. Considering the similar testing environment, we paid special attention and ... optir touchWebFeb 6, 2024 · The processing-grain size map showed that the DRX grain size decreased with the increase in Z, also revealing various characteristics ranging from a grain growth, grain refinement, to a bimodal distribution of ultrafine grains and partially recrystallized grains. The effect of twinning on the grain refinement was also evident at high Z conditions. porto\\u0027s downey californiaWebSep 25, 2024 · The dynamic recrystallization behavior of 42CrMo steel during the pre-stress hardening grinding (PSHG) process was investigated at temperatures ranging from 850-1150 °C and pre-stress from 0 MPa to 167 MPa. A coupled grain size model considering different grinding conditions was constructed to resea … porto\\u0027s food products commerce caWebSep 8, 2024 · The step size ranged from 0.5-4 μm, depending on the average grain size. The TEM examination was performed on an FEI Talos F200X microscope operated at 200 kV, and the specimens were prepared by standard procedures of mechanical grinding from 40–60 μm and ion milling. optiray 350 hcpcs code