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Saving a project through Rapid Manufacture in South Africa
Published in Paulo Jorge Bártolo, Artur Jorge Mateus, Fernando da Conceição Batista, Henrique Amorim Almeida, João Manuel Matias, Joel Correia Vasco, Jorge Brites Gaspar, Mário António Correia, Nuno Carpinteiro André, Nuno Fernandes Alves, Paulo Parente Novo, Pedro Gonçalves Martinho, Rui Adriano Carvalho, Virtual and Rapid Manufacturing, 2007
RM was more expensive than Vacuum casting for the manufacture of the boxes and since a limited quantity of boxes was needed, a decision was taken to use Vacuum casting for the first few of the boxes until such a time that more products were needed. Vacuum Casting is a much more flexible process than injection Moulding, and therefore the product could easily be designed to suit the customers’ needs without compromising functionality. If injection moulding would have been chosen, much more limitations would have been imposed on the product’s design. Figure 7 shows the cast halves.
Synthesis and evaluation on mechanical properties of LM4/AlN alloy based composites
Published in Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2022
Particulate reinforced aluminum matrix composites (PRAMCs) are currently prepared through various kind of methods like centrifugal casting, squeeze casting, vacuum casting, stir casting, powder metallurgy, mechanical alloying, in situ casting, and compo casting (Pazhouhanfar and Eghbali 2018; Ravichandran and Dineshkumar 2016; Sajjadi, Ezatpour, and Parizi 2012). Amid those processes, stir casting method is mainly preferred for the producing of PRAMCs due to its ease of adoption, cost-effectiveness, and large range of fabrication. The fabrication of PRAMCs through stir casting embraces melting of metal matrix and then incorporation of preheated ceramic filler material in molten metal. The next stage comprises solidification of melt to get homogeneous dissemination of ceramic reinforcement. The employ of conventional metal processing method and equipment’s, made stir casting technique more attractive among researchers, thus reduces the overall cost of manufacturing. Hence, stir casting is considered to be one of the most appropriate technique to fabricate the composites with discontinuous reinforcement in short time with low cost (Ezatpour, Parizi, and Sajjadi 2013; Juang, Fan, and Yang 2015; Senthilkumar, Manimaran, and Krishna Reddy 2019).
Development of Ti–Zr alloys by powder metallurgy for biomedical applications
Published in Powder Metallurgy, 2022
Angèlica Amigó-Mata, Montserrat Haro-Rodriguez, Ángel Vicente-Escuder, Vicente Amigó-Borrás
The obtained maximum bending strength results showed clear differences between both powders, and was accentuated by the greater fragility of the mechanically mixed powders, which underwent a slight decrease with Zr content with values going from 509 ± 12 MPa for the Ti-6Zr alloy to 470 ± 59 MPa for the Ti-20Zr alloy; Table 3. in the sintered elemental powder mixtures, similarly to those obtained by Ho et al. for Ti-20Zr [17]. In particular, the Ti-6Zr alloy had values of 1492 ± 71 MPa, which are higher than those obtained by Ho et al. for the Ti-30Zr alloy [17]. In any case, these values are higher than the 800 MPa of Ti CP, also indicated by Ho et al. in materials obtained by arc fusion and vacuum casting, which makes their use as biomaterials very appealing [17]. Apart from the results of Ho et al., Li et al. studied alloys Ti-30Zr with tensile strengths of 750 MPa and deformations at 7% breaks and shape memory behaviour [29]. Medvedev et al. indicated tensile strengths of 950 MPa and elongations of 17% for Ti-15Zr [30]. Li et al. [24] worked with samples of Ti-25at.-% of Zr, and obtained a maximum compressive strength of 1800 MPa. This is clearly superior to the maximum tensile strength obtained by either Ho et al. [17] or Medvedev et al. [30].
Microstructures and strengthening mechanisms in high-carbon titanium-microalloyed interstitial-free steels
Published in Philosophical Magazine Letters, 2018
Zaiwang Liu, Yonglin Kang, Yiding Li
The steel samples were made in a 50 kg-capacity vacuum induction melting furnace followed by vacuum casting, hot rolling, laminar cooling, and then coiling. Three recipes were used to make the experimental steels with major difference in C content as shown in Table 1. Major hot-rolling process parameters include a slab heating temperature of 1473–1543 K, a soaking time of 2 hours to ensure well equalised heat distribution to ensure sufficient dissolution of second-phase particles in the slab, an initial rolling temperature of 1323 K, and a finishing rolling temperature of 1200 K. The coiling temperatures (CT) are 1000 and 853 K, respectively. The final sample steel thickness is 2 mm. Samples are denoted by the combination of C content in ppm and the CT in K. For example, #80-853 refers to the steel sample with 80 ppm C and 853 K CT, #20-1000 to the steel sample with 20 ppm C and 1000 K CT.