Oil futures tumbled more than $5 a barrel on news that the Biden administration is considering releasing about 1 million barrels a day from the U.S. Strategic Petroleum Reserve (SPR) for several months to cool surging crude prices.
Brent crude futures were down $4.71, or 4.2 percent, at $108.58 a barrel by 0035 GMT. U.S. West Texas Intermediate futures fell $5.45, or 5 percent, to $102.74 a barrel.
At an earlier time, gasoline prices had already reached record levels because of the Russia-Ukraine conflict.
The prices of other commodities like the Ti6Al4V powder are also expected to be volatile.
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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COVID-19 has led to many sites shutting down. What is the impact on China's foreign trade enterprises as a whole and small, medium and micro foreign trade enterprises?
. It is learned that some foreign trade enterprises have been affected by the epidemic and are facing periodic problems in production, operation, logistics and transportation. At the same time, problems such as rising raw material costs, slow cross-border transport and supply chain bottlenecks have not been fundamentally alleviated, and foreign trade enterprises, especially micro, small and medium-sized enterprises, are still facing considerable operating pressure. The price of Ti6Al4V powder operated by foreign trade enterprises will also fluctuate with the changes of the epidemic. Contact us for the latest quotation on Ti6Al4V powder.
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