Ultrapure smelting process for nickel-base high-temperature alloy
A technology of nickel-based superalloy and smelting method, applied in the field of vacuum smelting, can solve the problems of inability to balance low carbon and low gas content, unsatisfactory decarburization and degassing effect, difficult control of volatile elements, etc. Control, short refining time, low cost effect
Inactive Publication Date: 2006-02-15
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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Problems solved by technology
To smelt low-carbon superalloys, it is necessary to decarburize while deoxidizing, which requires prolonging the refining time and increasing the refining temperature, but it will make it difficult to control some volatile elements in vacuum, and the decarburization and degassing effects are not good. Ideal, the gas content cannot be reduced to the desired level, and low carbon and low gas content cannot be balanced
According to the traditional process, the purpose of low gas and carbon content can also be achieved by selecting high-purity raw materials, but the cost of smelting will be greatly increased
Method used
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[0016] The present invention is described in detail below in conjunction with embodiment and accompanying drawing.
[0017] Taking a Ni75-Co5-W6-Cr6-Al6-Ti2 experimental nickel-based superalloy as an example, first nickel, cobalt, chromium, and tungsten are subjected to the following degassing treatment:
[0018] Take electrolytic nickel and electrolytic cobalt, respectively add 0.015% carbonization clear, then raise the temperature to 1600°C for high temperature refining for 15 minutes, turn off the power to condense thoroughly, then raise the temperature to 1490°C for low temperature refining for 20 minutes, after the low temperature refining, raise the temperature to 1500°C and pour into cast iron Ingots for spare. see figure 1 Process curve.
[0019] Take electrolytic chromium and tungsten strips and add 50% electrolytic nickel solution respectively, then raise the temperature to 1650°C for high-temperature refining for 20 minutes, power off to condense thoroughly, then ...
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Process for melting Ni based high temperature alloy with super purity is carried out by degassing at first, purifying alloy elements and heating-up to 1600 - 1650 deg.C for 15 - 20 minutes, cooling to condense, next, heating-up to 1490 - 1540 deg.C for 20 - 30 minutes again, casting into ingots at 1500 - 1550 deg.C, then, melting degassed elements as raw materials to produce Ni based alloy with low carbon and gas contents. Because the raw material is degassed, no carbon is added, and melting time is not long, The Ni based alloy with low carbon and gas contents is obtained.
Description
technical field [0001] The invention relates to a vacuum smelting technology, in particular to an ultra-pure smelting method of a nickel-based superalloy with low gas and carbon content by using common raw materials. Background technique [0002] The gas in the alloy will cause pores and porosity in the alloy, and the pores and porosity usually become the source of alloy fracture cracks. Therefore, reducing the alloy gas content is an important means to improve the strength of superalloys. For some nickel-based superalloys, carbide is a harmful phase, and too much carbide will harm the properties of the alloy. Therefore, it is necessary to invent an ultra-pure smelting method that reduces both gas content and carbon content. [0003] In the traditional superalloy vacuum smelting process, the method of adding carbon is usually used to deoxidize. To smelt low-carbon superalloys, it is necessary to decarburize while deoxidizing, which requires prolonging the refining time and...
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IPC IPC(8): C22C19/03C22C1/02C22C1/06
Inventor 王志辉金涛计永茂侯桂臣赵乃仁孙晓峰管恒荣胡壮麒
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI