By Erhard Klar
Growth within the knowing of corrosion and corrosion resistance homes of sintered stainless steels has result in new purposes that reap the benefits of internet form processing and extra effective fabric usage. The textual content, huge portraits, and tabular summaries offer a accomplished connection with receive solid corrosion resistance homes of sintered stainless steels with cautious processing, beginning with powder choice, avoidance of infection, effective delubrication, and regulated sintering and cooling. Misconceptions and conflicting literature are significantly assessed.
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Additional info for Powder Metallurgy Stainless Steels: Processing, Microstructures, and Properties
The horizontal design is said to be less expensive than a vertical design. Melting is performed in open air. Nevertheless, because of the absence of oxidation during atomization, the powder possesses practically the same chemical composition as the melt, and oxygen contents are quite low, typically less than 200 ppm. Although low-oxygen, inert-gas-atomized powders also show surface enrichment of its high-oxygen-affinity constituents, such oxide layers are only a few atomic layers thick, and any negative effects on interparticle bonding can be minimized or eliminated by including shearing elements in the consolidation process.
After water atomization, the fine powder particles suspended in the powder-water slurry in the atomizing tank are allowed to settle so that excess water can be decanted. Removal of the remaining water is accomplished by centrifuging, filtrating, vacuum or heat treating, or combinations of these. The dried powder is then screened, either to remove oversize particles, nominally +100 mesh (+149 μm) for compacting-grade powders, or to generate various screen cuts for stainless steel filter applications.
Lubricating. The two most widely used lubricants for stainless steel powders are lithium stearate and Acrawax C (ethylene bis stearamide). 0% additions are most widely used), lubricants have several other functions and consequences. 14 show the effect of three different lubricants on compressibility and green strength of 316L. Parts producers take advantage of these differences in that they select lithium stearate when high sintered density matters, and stearic acid when superior green strength is required, or they use combinations of lubricants (Chapter 4, “Compacting and Shaping”).
Powder Metallurgy Stainless Steels: Processing, Microstructures, and Properties by Erhard Klar