The effect of process parameters on cell morphology in cellular aluminium alloy fabricated by powder compression and the induction heating process

2003 ◽  
Vol 217 (2) ◽  
pp. 201-211 ◽  
Author(s):  
S W Youn ◽  
C G Kang
Keyword(s):  
Mechanical Properties ◽  
Aluminium Alloy ◽  
Induction Heating ◽  
Process Parameters ◽  
Cell Structure ◽  
Heating Process ◽  
Pressing Pressure ◽  
Foaming Process ◽  
Powder Compression ◽  
Foaming Temperature

In a foaming process, accurate control of the foaming temperature and heating rate is very important in terms of reproducibility of mechanical properties. Generally, foaming of the precursor is performed in an electric furnace, which is preheated at temperatures higher than the desired temperature. In this case, accurate control of the precursor temperature is difficult. In this study, cellular aluminium alloy having a closed cell structure is fabricated by applying the powder compact method and an induction heating process. The induction heating process was used for foaming of the precursor in order to improve the reproducibility of mechanical properties. To establish the cellular aluminium fabrication conditions, the effects of process parameters such as the titanium hydride content (0.3-1.5 wt%), pressing pressure of the foamable precursor (50-150 kN) and the foaming temperature (610-690°C) on the pore morphology were investigated and porosities (%)-foaming temperature curves were obtained.

scholarly journals Parameter Optimization and Prediction Model of Induction Heating for Large-Diameter Pipe

2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
Xiurong Fang ◽  
Jia Lu ◽  
Junfeng Wang ◽  
Jinhui Yang
Keyword(s):  
Prediction Model ◽  
Induction Heating ◽  
Process Parameters ◽  
Pipeline Steel ◽  
Large Diameter ◽  
Outer Wall ◽  
Design Parameters ◽  
Heating Process ◽  
Influence Of Process Parameters ◽  
Heating Device

The parameters of induction heating of large-diameter pipes have a direct effect on the final processing quality of the elbow, and the complexity of multifield coupling of magnetothermal force in induction heating can make it impossible to quantitatively optimize the design parameters of the induction heating device. In this paper, X80 pipeline steel induction heating is taken as the research object, and a corresponding numerical model is established. The influence of induction heating process parameters on the heating temperature of pipeline steel under the skin effect is determined. First, the influence of process parameters on the heating effect of pipeline steel is quantified by orthogonal test. Then, taking the optimum temperature difference between the inner and outer wall of X80 pipeline steel during the induction heating process as a target, the optimal process parameter set of the pipe induction heating is determined by using neural network genetic algorithm. Finally, comparing the relevant test criteria of the regression equation, the optimum mathematical prediction model of the outer wall temperature of the pipe induction heating process is obtained, which provides a theoretical basis for optimization of the process parameters of the pipe-based induction heating device.

Effect of Repeated Induction Heating on Fatigue Crack Propagation in SAE 52100 Bearing Steel

2011 ◽  
Vol 217-218 ◽  
pp. 1266-1271 ◽  
Author(s):  
Hitonobu Koike ◽  
Edson Costa Santos ◽  
Katsuyuki Kida ◽  
Takashi Honda ◽  
Justyna Rozwadowska
Keyword(s):  
Mechanical Properties ◽  
Crack Propagation ◽  
Induction Heating ◽  
High Strength ◽  
Bearing Steel ◽  
Rolling Contact ◽  
Heating Process ◽  
Cyclic Heat Treatment ◽  
Heat Treated ◽  
Cyclic Heat

Martensitic high carbon high strength SAE 52100 bearing steel is one of the main alloys used for rolling contact applications when high wear and fatigue resistance are required. Refining the microstructure of steel improves its mechanical properties (e.g. toughness). In this work SAE 52100 specimens were exposed to repeated induction heating process and rotation bending tests were performed using single- and repeatedly heat-treated material in order to investigate the influence of this cyclic heat treatment on the mechanical properties of SAE 52100. In an attempt to determine the effect of the repeated induction heating and quenching on the material, we focused our observations on the internal fatigue “fisheye" cracks. It was noted that crack propagation was successfully halted by the refined microstructure in heat affected zone, therefore it can be concluded that repeated induction heating and quenching processes help to slow down the propagation of fisheye cracks in SAE52100 steel bars.

Effect of Plasticizer (DOP) on Cell Structure and Mechanical Properties of Extrusion-Foamed PVC Sheet

2015 ◽  
Vol 815 ◽  
pp. 601-606 ◽  
Author(s):  
Ming Yi Wang ◽  
Nan Qiao Zhou ◽  
Jun Hu
Keyword(s):  
Mechanical Properties ◽  
Cell Structure ◽  
Dioctyl Phthalate ◽  
Bubble Coalescence ◽  
Low Density ◽  
Foaming Agent ◽  
Elongation At Break ◽  
Foaming Process ◽  
Continuous Extrusion ◽  
Scanning Electron

Using supercritical CO2 as the foaming agent, rigid polyvinyl chloride (R-PVC) foam sheets were prepared in a continuous extrusion foaming system. The effects of dioctyl phthalate (DOP) on the rheological properties of PVC were investigated using a Brabender torque rheometer while other basic formula remained unchanged. The influences of DOP content on microstructure, mechanical properties and density of PVC micro foamed sheet were investigated with scanning electron microscopy (SEM). The results showed that the addition of DOP resulted in increased flexibility and the elongation at break of the foamed PVC sheet, while the mechanical properties of foamed PVC sheet decreased with the increase of DOP content, implying that excessive addition of DOP will cause gas escape and bubble coalescence in the foaming process. Low density PVC foam sheets with fine cell morphology were obtained when 2 phr DOP was added in PVCformula.

scholarly journals The influence of supercritical foaming conditions on properties of polymer scaffolds for tissue engineering

2017 ◽  
Vol 38 (4) ◽  
pp. 535-541 ◽  
Author(s):  
Katarzyna Kosowska ◽  
Marek Henczka
Keyword(s):  
Mechanical Properties ◽  
Tissue Engineering ◽  
Process Parameters ◽  
Three Dimensional ◽  
Experimental Investigations ◽  
Porous Structures ◽  
Static Compression ◽  
Precise Control ◽  
Foaming Process ◽  
Supercritical Foaming

Abstract The results of experimental investigations into foaming process of poly(ε-caprolactone) using supercritical CO2 are presented. The objective of the study was to explore the aspects of fabrication of biodegradable and biocompatible scaffolds that can be applied as a temporary three-dimensional extracellular matrix analog for cells to grow into a new tissue. The influence of foaming process parameters, which have been proven previously to affect significantly scaffold bioactivity, such as pressure (8-18 MPa), temperature (323-373 K) and time of saturation (1-6 h) on microstructure and mechanical properties of produced polymer porous structures is presented. The morphology and mechanical properties of considered materials were analyzed using a scanning electron microscope (SEM), x-ray microtomography (μ-CT) and a static compression test. A precise control over porosity and morphology of obtained polymer porous structures by adjusting the foaming process parameters has been proved. The obtained poly(ε-caprolactone) solid foams prepared using scCO2 have demonstrated sufficient mechanical strength to be applied as scaffolds in tissue engineering.

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