Thursday, April 12th, 2018

Stabilization of Silver Tungsten Alloy in the Melting Temperature Range

Silver Tungsten Alloy in China, mainly Cobalt-Chromium Alloy superalloys more in-depth and thorough. Unlike other superalloys, Cobalt-Chromium Alloy superalloy does not consist of an ordered precipitated phase that is firmly bonded to the substrate, but instead consists of a matrix of fcc that is solid-solution strengthened and a small amount of carbides distributed in the matrix. Casting Division Stanley superalloy is to a large extent rely on carbide strengthening. Pure cobalt crystals at 417 ° C are densely packed hexagonal (hcp) crystalline structures that are converted to fcc at higher temperatures. In order to avoid this conversion of Cobalt-Chromium Alloy superalloy in use, virtually all Cobalt-Chromium Alloys are nickel alloyed to stabilize the tissue from room temperature to the melting temperature.

From the late 1950s to the late 1960s, the United States has widely used four types of Foundry Stellite: WI-52, X-45, Mar-M509 and FSX-414. Deformation Division too much alloy for the plate, such as L-605 for the production of combustion chambers and catheters. HA-188, which appeared in 1966, has improved oxidation resistance due to lanthanum contained therein. Soviet Union used to make guide vane Cobalt-Chromium Alloy ΠK4, equivalent to HA-21. Cobalt-Chromium Alloy should consider the development of cobalt resources. Cobalt is an important strategic resource. Cobalt is lacking in most countries in the world. As a result, the development of Cobalt-Chromium Alloy is limited.

Pure cobalt crystals at 417 °C are densely packed hexagonal (hcp) crystalline structures that are converted to fcc at higher temperatures. In order to avoid this conversion of Cobalt-Chromium Alloy superalloy in use, virtually all Cobalt-Chromium Alloys are nickel alloyed to stabilize the tissue from room temperature to the melting temperature. Cobalt-Chromium Alloy has a flat fracture stress-temperature relationship, but exhibits superior hot corrosion resistance at temperatures above 1000 °C compared to other high temperatures, probably because of the higher chromium content of the alloy, this is the feature of Cobalt-Chromium Alloy.

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