The price of nickel and stainless steel rose together. Nickel afternoon hand in hand with stainless steel together turn red up. Due to the temporary easing of geopolitical risks, risk assets are now picking up, nonferrous metals, stock markets, and so on have risen, the overall mood has temporarily improved. Ore prices are strong, the overlay of the epidemic on spot logistics or the formation of a certain impact. Phase, nickel and stainless steel materials to maintain high wide concussion pattern.
Nickel prices based on low inventory, tight supply and demand will still show high wide fluctuations. In addition, the current LME has low liquidity, so its sensitivity to capital will remain relatively high. Shanghai nickel-wide fluctuations are expected to continue in the 200,000-250,000 yuan wide repeated fluctuation trend. While stainless steel is affected by the stronger nickel pig iron, the cost support continues, but note that under the current demand is not effectively released, the upward space may also be affected, the stage is expected to fluctuate between 20000 and 22,000 yuan. The price of nickel produced such fluctuations, indicating that the price of the Ti6Al4V powder may also be affected to a certain extent.
In the powder bed laser melting technology, from the production, transportation, storage, printing and recycling of materials, the powder has been under a variety of mechanical and atmospheric environments throughout the process chain, the chemical composition and shape of the powder particles, and the entire process. The characteristics of powder materials may be affected by factors such as the atmosphere, temperature, humidity, and external forces. This article discusses the potentially important influencing factors of TC4 powder in the entire process. The research results can be used in other powder processing and management to ensure the quality of the material throughout the service life and make the SLM process more robust and reliable.
In order to evaluate the characteristics and batch stability of the powder, the same specifications and two batches produced by TC4-Ti6Al4V(level 5) three different processes (gas atomization EIGA, plasma atomization PA, inductively coupled plasma atomization ICPA) were studied. For powders, the particle size distribution, particle morphology and fluidity of these powders were measured.
The results show that the sizes of the three powder particles are between 15-65 microns, with a Gaussian distribution, but the PA and ICPA powders show a wider particle size distribution compared with the EIGA powder. The flow time measured by the Hall flowmeter is in the range of 14.6s-16.1s, indicating that all powders and batches have good flowability. Electron microscopy results show that the three powders have high spherical shapes, but the EIGA powder particles are slightly elongated, while the ICPA powder contains a lot of satellite powder.
In order to study whether argon protection is required during powder storage, two powder containers were stored under the same conditions of 30°C and 30% relative humidity. One container has been stored intact, and the protective atmosphere of the other container is destroyed by one opening process. After a storage period of ten days, samples for mechanical testing and elemental measurement were prepared.
The results of the tensile test show that the ultimate tensile strength of the sample is basically the same in a protective atmosphere and an unprotected atmosphere; the powder stored in a humid environment has the highest ultimate strength, which is slightly higher than that of the dry powder printed sample 5%, and the elongation rate dropped severely. Gas content measurement confirmed that in a humid environment, the oxygen content of the sample is about 10% higher than that in a dry environment, which leads to material embrittlement.
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Due to the Russia-Ukraine conflict and the covid-19 pandemic, how will the international situation develop is highly uncertain. It is too difficult to assess its economic impact properly. However, we could see energy prices and commodity prices keep rising and supply chains are disrupted. Therefore, Ti6Al4V powder prices are expected to rise in the future.
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