The Powder Breakage Behavior and Mechanism During Semi-solid Powder Forming

Wu, Min; Liu, Jian; Luo, Xia; Liu, Yunzhong; Cai, Renye; Kong, Chunyu; Wu, Qiang

doi:10.1007/s11837-023-05868-6

Cited by 3 publications

(4 citation statements)

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“…According to ref. [28], the powder at a higher temperature may slide along the grain boundary inside the powders, resulting in powder breakage during semi-solid powder compression. Combined with the changes in the grain size and shape of the powders in Figure 5b, it can be deduced that some powders break down at 540 • C, resulting in pores being reduced.…”

Section: Resultsmentioning

confidence: 99%

“…The deformation behavior of AA2024 is characterized by stress-strain curves in Figure 7 (for details, see ref. [28]). As seen in Figure 7, the peak stress decreases with increasing temperature, indicating that the deformation resistance decreases.…”

Section: Simulation and Analysis Of The Stripmentioning

confidence: 99%

“…Figure 8 shows distribution diagrams of the strip temperature field and the contact normal force field at incremental step 57 when the powder temperature is 600 • C. According to ref. [28], it is known that semi-solid powder material can be treated as a porous solid material during SSPF when the powder temperature is between 509 and 580 • C. Therefore, Figure 8a To verify the precision of the model and its parameters, the temperature vs. tim curve of node 1 (marked in Figure 6) rolled at 600 °C was calculated by the model and was compared with the measured value, shown in Figure 9. As the thermocouple wa placed first at the bottom of the hopper and then rolled into the strip with powders, th As shown in Figure 8a, the strip temperature in section I (with a yellow color) has been reduced from the initial value of 600 • C to about 590.6 • C, and thus it is in a semi-solid state.…”

Section: Analysis and Verification Of The Strip Temperature Fieldmentioning

confidence: 99%

“…It indicates that only a small amount of powders in section I have been broken. But all powders at 600 • C crush during the semi-solid compression of porous AA2024 [28]. This is because although the breakage resistance of powders at 600 • C is very small, the rolling force (details discussed in Section 4.4) in section I of SSPR is also small and thus only a part of powders may reach the breakage condition.…”

Section: Analysis and Verification Of The Strip Temperature Fieldmentioning

confidence: 99%

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The Effect of Powder Temperature on Semi-Solid Powder Rolling AA2024 Based on Experiments and Numerical Simulation

Wu,

Cai,

Wang

et al. 2023

Metals

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Semi-solid powder rolling (SSPR) is widely used to produce alloy strips with fine grains and excellent performances in the automotive, aerospace and shipbuilding industries. During SSPR, powder temperature, as a very important parameter, greatly affects strips’ microstructures and mechanical properties, which have been investigated by many researchers, but its effect on the forming process and mechanism has rarely been studied. Therefore, based on online experimental detection and transient simulation, the microstructures, strip temperatures, relative densities and rolling forces at different conditions were, respectively, measured, calculated, compared and analyzed in order to study the deformation process and mechanism during SSPR. The result shows that with the increase in powder temperature, the strip temperature and relative density increase, while the rolling force decreases. The grains of the strips are refined after SSPR, and fine and dense microstructures are obtained at 600 °C, which is the optimum powder temperature. In the main deformation sections (II and III), when the contact normal force exists and reaches a maximum, the relative density and rolling force increase rapidly. At these sections, the strips rolled at 600 °C are mainly in a porous solid state, and powder crushing dominates the strip deformation. Therefore, SSPR at 600 °C and below can be considered porous or powder hot rolling, integrating powder crushing, solidification, deformation, densification and grain coarsening. Moreover, as the simulated values are basically consistent with experimental values, the thermomechanical coupling model based on the Fourier equation and its parameters are confirmed to be reasonable.

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Section: Resultsmentioning

confidence: 99%

Section: Simulation and Analysis Of The Stripmentioning

confidence: 99%

Section: Analysis and Verification Of The Strip Temperature Fieldmentioning

confidence: 99%

Section: Analysis and Verification Of The Strip Temperature Fieldmentioning

confidence: 99%

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