Keyhole pores are frequently found to emerge when the bottom tip of a "J"-like keyhole is pinched off, as confirmed by in-situ high-speed X-ray imaging [13].A particular recent research focus is to understand the mechanism of pore formation relevant to the dynamic evolution of a "J"-like keyhole [17], [44]. Fig. 2 shows a comparison of the …

The key to Maelstrom's solution is a 3-step approach to powder addition: Meter the powder using an accurate volumetric or loss-in-weight feeder …

Wear performance and mechanisms of PCBN tools with different CBN content (80% vol. and 95% vol.) and cutting edge geometry (honed edge radius, 0.05 mm chamfered edge width, and 0.10 mm chamfered edge width) in boring powder metallurgy (PM) steels had been evaluated. Post-cutting examination of the worn cutting inserts …

Magnesium powder is widely used in propellants,[1,2,3,4,5,6] pyrotechnics,[2,3,4,7] and explosives.[3,4] Although combustion enthalpy (∆H c) of the magnesium powder is lower than that of the aluminum powder,[] magnesium powder has a higher burning rate[] and lower ignition temperature,[] which have attracted the …

Zurecki Z, Ghosh R, Frey JH. Finish-turning of hardened powder metallurgy steel using cryogenic cooling. Int J Powder ... Sun FJ, Qu SG, Deng ZH, et al. Shear band formation and wear mechanism of titanium alloy powder metallurgy material prepared by HIP using Ti-6Al-4V pre-alloy powder. Int ... ADD TO CART Added to cart. …

ACMs are the most widely used milling technology in the powder-processing industry today for the general size reduction of fine chemicals and food products. The basic advantage of these mills is that …

Laser powder bed fusion (LPBF) additive manufacturing (AM) has been adopted by various industries as a novel manufacturing technology. Powder spreading is a crucial part of the LPBF AM process …

Analysis of machining green compacts of a sinter-hardenable powder metallurgy steel: A perspective of material removal mechanism April 2023 CIRP Journal of Manufacturing Science and Technology 41 ...

The etching mechanism of FC on SS is studied, and the hydration heat evolution and hydration products, soundness and compressive strength of SS paste and cement paste containing SS are compared. ... This study utilized 3 mol/L hydrochloric acid to activate steel slag powder in combination with carbonation and produced the artificial …

Minimizing the negative effects of the manufacturing process on the environment, employees, and costs while maintaining machining accuracy has long been a pursuit of the manufacturing industry. Currently, the nanofluid minimum quantity lubrication (NMQL) used in cutting and grinding has been studied as a useful technique for …

1. Introduction. In the Laser Powder Bed Fusion (LPBF) Additive Manufacturing (AM) process, a high energy laser beam travels over the build area in a carefully controlled speed and scan pattern to selectively melt the powder layer spread over the build plate, as per the designed parameters [[1], [2], [3]].The LPBF process is used …

1. Introduction. In recent years, micro-textured cutting tools have been applied in practical production to process materials with high hardness, high strength, and high-temperature resistance [1], demonstrating superior turning performance and providing a new approach for machining challenging materials.The design of micro-textured can …

Carefully pour formula powder into the powder container. Wipe up any spilled formula powder. Make sure that the powder is filled between the MIN & MAX lines on the powder container. Place the powder container lid on the powder container and turn clockwise until it stops. This will engage the safety switch & lock the powder container onto the base.

The chemical composition of the pure Zn powder is listed in Table 1, and the physical indices are listed in Table 2. The maximum particle size of pure Zn powder was 43.21 μm, and the average particle size was approximately 7 μm. Zn–2 wt%Cu alloy powder was prepared by mixing pure Zn powder and nano-Cu through mechanical ball …

Repeating the cleaning cycle helps clear the really stubborn DE powder. Step 8: Turn the equipment off again. Step 9: Rotate the valve to the "Filter" position. Step 10: Turn equipment back on and add new DE powder. …

Hosseini et al. (2014) and Hosseini et al. (2015) studied the formation mechanism of the white layer of hardened steel turning in conjunction with TEM experiments and considered phase transformation, dynamic recrystallization, and plastic deformation as the main mechanisms of white layer formation.

Hydrangea macrophylla is an ornamental plant with varied calyx colors. Interestingly, from red, to purple, to blue, the colors of all Hydrangea macrophylla are formed by unique delphinidin-3-O-glucoside and aluminum ions (Al3+) and 5-O-p-coumaroylquinic acid. The sepals of 'Blue Mama' changed from pink to blue, and the …

2.1. Characterisation of Ni-rich NiTi alloy powder. The powder used in this study was pre-alloyed and provided by Advanced Materials Manufacturing Technology Co., Ltd. Figure 1 (a) shows the SEM image of the powder morphology. The powder shows an ideal spherical shape and smooth surface, which fulfill the requirements of particle …

Apart from the ones mentioned above, many other pneumatic based mechanisms for powder metering and transport are reported in the literature [84, 85], …

The temperature plays a crucial role in determining the effectiveness of pathogen eradication, as an elevated temperature significantly enhances both the rates of pathogen elimination and the quality of compost [52].The incorporation of additives across the composting continuum resulted in a rapid increase in temperature during the initial …

The packing density of the powder layer plays a key role in the final quality of the parts fabricated via powder-bed-based (PBB) additive manufacturing. This paper presents a combined experimental and computational modeling study on the scraping type of powder-spreading process, in order to understand the fundamental mechanisms of the packing …

3.10 Powder processing techniques. Before we leave forming we should consider powder processing techniques, (), which have elements of both casting and forming.Essentially …

However, we must remember that the purpose of the turning point function is to speed up the beam speed near the turning point to maintain the same (ideally) molten pool geometry. Therefore, we believe that the turning point function does not negatively impact here. Line offset refers to the distance between the center of two scanning lines.

Metal powder is a ubiquitous material in metal additive manufacturing. The performance of additively manufactured samples is closely linked to the morphology, …

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In continuous ceramic turning operations, the temperature on the rake face of the insert can reach 1200 °C; these high cutting temperatures quickly influence the degradation of the SiAlON or WFA ceramic turning insert via diffusion wear mechanisms, resulting in the creation of wear craters on the rake face, which quickly become …

Firstly, based on the above test scheme, the turning-processing area shown in Fig. 1 (b) of NC lathe equipment CAK5058 shown in Fig. 1 (a) was used to turn nickel-based single-crystal superalloy DD98 under different cutting parameters in Table 2.The nickel-based single-crystal superalloy cylinder workpiece was shown in Fig. 1 (b), whose …

Understanding the spattering mechanism will give a clue to mitigating spattering for the heterogeneous surface. Young et al. 39 investigated the spattering mechanism on a homogeneous powder bed using in-situ high-speed, high-energy X-ray imaging. Furthermore, spattering is classified into five styles based on the laser power …

Process Definition and Advantages. Powder bed fusion (PBF) is an additive manufacturing process and works on the same basic principle in that parts are formed through adding material rather than subtracting it through …

1.. IntroductionOwing to its good tensile and creep properties, and its stability up to 700 °C, the polycrystalline NR3 nickel-based superalloy, containing a bimodal γ′ precipitation, is a good candidate for turbine disks in a supersonic airplane engine [1].In real working conditions, the disks are expected to experience creep …