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Homogenization process of high-tungsten high-cobalt nickel alloy ingot

A nickel alloy and homogenization technology, applied in the field of nickel alloy homogenization process with high tungsten and high cobalt, can solve the research results of no homogenization method and sound velocity test, research and report on alloy homogenization method, no high tungsten and high cobalt found Research on high-cobalt-nickel alloys, etc., to achieve the effects of improving cold and hot working properties, eliminating element segregation, and improving cold and hot working plasticity

Pending Publication Date: 2019-11-08
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High tungsten and high cobalt nickel alloys contain tungsten and cobalt much higher than nickel-based superalloys, and the redistribution of tungsten and cobalt during solidification will lead to extremely serious dendrite segregation, making the high tungsten and high cobalt nickel alloy ingots cold Sharp decrease in hot workability
[0005] In 2011, the US patent US7921778B2 announced a nickel alloy with high tungsten and high cobalt. Research on cobalt-nickel alloys, let alone research results on homogenization methods and sound velocity tests
Although there have been many research results on the homogenization process of nickel-based superalloys, no homogenization process has been found for nickel alloys with high tungsten (≥25wt.%) and high cobalt (≥15wt.%) content.

Method used

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  • Homogenization process of high-tungsten high-cobalt nickel alloy ingot
  • Homogenization process of high-tungsten high-cobalt nickel alloy ingot
  • Homogenization process of high-tungsten high-cobalt nickel alloy ingot

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Effect test

Embodiment 1

[0026] 1) An exemplary high-tungsten and high-cobalt nickel alloy contains, by mass percentage: 35% tungsten, 20% cobalt and the balance nickel.

[0027] 2) According to the element ratio of the alloy described in step 1), the raw materials are weighed, including: metal tungsten bar, metal cobalt plate and metal nickel plate. It was then melted in a vacuum induction furnace and cast into 25kg ingots.

[0028] 3) Cut a 20mm thick disc from the head of the Ni-based alloy ingot by wire cutting, and then cut a 10×10×10mm cube sample at the 1 / 2 radius of the disc. The sample was polished to 7000# step by step with metallographic sandpaper, then mechanically polished, and then CuSO 4 The dendrite structure of the ingot is obtained by chemical etching of the etching liquid, such as figure 1 shown. The energy spectrometer supporting the scanning electron microscope was used to measure the chemical composition of the main elements in the dendrite stem and between the dendrites at di...

Embodiment 2

[0035] 1) An exemplary high-tungsten and high-cobalt nickel alloy contains, by mass percentage: 35% tungsten, 20% cobalt and the balance nickel.

[0036] 2) According to the element ratio of the alloy described in step 1), the raw materials are weighed, including: metal tungsten bar, metal cobalt plate and metal nickel plate. It is then melted in a vacuum induction furnace and cast into 500kg ingots.

[0037] 3) Cut a 20mm thick disc from the head of the Ni-based alloy ingot by wire cutting, and then cut a 10×10×10mm cube sample at the 1 / 2 radius of the disc. The sample was polished to 7000# step by step with metallographic sandpaper, then mechanically polished, and then CuSO 4 The dendrite structure of the ingot is obtained by chemical etching of the etching liquid, such as figure 1 shown. The energy spectrometer supporting the scanning electron microscope was used to measure the chemical composition of the main elements in the dendrite stem and between the dendrites at di...

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Abstract

The invention provides a homogenization treatment process of a high-tungsten high-cobalt nickel alloy ingot, and belongs to the technical field of metal materials. The basic composition of the alloy comprises the following components of, in percentage by mass, 25-45 wt.% of tungsten, 15-25 wt.% of cobalt and the balance nickel and inevitable impurities. The method comprises the following steps ofcarrying out homogenization treatment on the high-tungsten high-cobalt nickel alloy, putting the high-tungsten high-cobalt nickel alloy ingot into a heat treatment furnace, wherein the furnace loadingtemperature is less than or equal to 600 DEG C; heating to 1150-1250 DEG C, and controlling the heating speed to be 10-80 DEG C / h; keeping the temperature at 1150-1250 DEG C for more than or equal to24 hours; and cooling the heat-treated ingot to 700 DEG C or below along with the furnace, and then air-cooling to the room temperature. According to the high-tungsten high-cobalt nickel alloy cast ingot treated by the process, component segregation is eliminated, the structure is uniform, the hot working plasticity can be improved, and the sound velocity can reach 5529m / s.

Description

technical field [0001] The invention belongs to the technical field of metal materials, and relates to a high-tungsten and high-cobalt nickel alloy homogenization process. Background technique [0002] During the casting and solidification process of the alloy, due to the solute redistribution process, there are often component segregation and precipitation of segregated phases in the ingot during solidification. Composition segregation leads to uneven structure and properties of the material, and severe segregation may even cause the ingot to crack during forging. The precipitation of segregated phases will deteriorate the microstructure of the alloy and reduce the mechanical properties of the alloy. Therefore, in actual production, uniform diffusion annealing is carried out at a higher temperature for a certain period of time, so that the segregated elements in the structure can be diffused evenly, and the segregated phase can be melted back to achieve the purpose of maki...

Claims

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Application Information

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IPC IPC(8): C22F1/00C22F1/10
CPCC22F1/00C22F1/10
Inventor 郑磊赵鑫侯云辉杨宝良廖裕刚唐婧
Owner UNIV OF SCI & TECH BEIJING
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