Unlock instant, AI-driven research and patent intelligence for your innovation.

Electroslag remelting slag system of cobalt-based high temperature alloy

A high-temperature alloy and electroslag remelting technology, which is applied in the field of electroslag remelting slag system of cobalt-based superalloys, can solve the problem of increasing the number of oxide inclusions, the content of rare earth elements in electroslag steel, and the lack of rare earth elements. problems, to achieve the effect of improving the utilization rate of electric energy, good surface quality and reducing heat loss

Inactive Publication Date: 2017-06-16
CHONGQING MATERIALS RES INST
View PDF3 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, CaO has strong water absorption and is easy to bring oxygen into the smelting process.
When the above-mentioned slag system is used for smelting and processing of G H 188 alloy, the rare earth metal La is generally added to the electrode rod or coated on the electrode rod. The alloy droplet / slag interface, the alloy droplet / slag interface during the filtration in the slag liquid after the droplet formation, and the molten steel / slag interface between the molten steel pool and the slag liquid are burned, and the burning loss rate reaches 90%. Above, the content of rare earth elements in electroslag steel is very small, and the good effect of rare earth elements on steel properties cannot be exerted, which makes it difficult to accurately control the composition of rare earth element La in GH188 alloy, and it is easy to cause fluctuations and uneven distribution of components in the alloy. The problem
In addition, due to the increase of oxygen content in the slag system, the number of oxide inclusions also increases, which affects the overall performance of the alloy.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Electroslag remelting slag system of cobalt-based high temperature alloy
  • Electroslag remelting slag system of cobalt-based high temperature alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1) Preparation of self-fusing electrode rod

[0021] Take the components in Table 1, with a total weight of 31kg, and prepare a self-melting electrode rod of GH188 cobalt-based superalloy steel ingot with a diameter of φ100mm by vacuum induction melting and casting.

[0022] Table 1 GH188 superalloy ingredient distribution table wt%

[0023] C Si mn La Cr W Ni co 0.099 0.36 0.77 0.21 22.21 14.66 22.27 margin

[0024] 2) Configure electroslag remelting slag system

[0025] Weigh CaF 2 4.02kg, Al 2 o 3 1.02kg, MgO 0.6kg, La 2 o 3 0.36kg, of which the total amount of impurities is less than 1.5%, and the impurities are unavoidable impurities, including MnO, TiO 2 , CaO, FeO, where MnO≤0.2%, TiO 2 ≤0.2%, CaO≤0.1%, FeO≤0.3%. Configured as an electroslag heavy slag system with a total weight of 6kg.

[0026] 3) Electroslag remelting

[0027] Mix the prepared electroslag remelting slag evenly, bake it at 800°C for 4 hours, use ...

Embodiment 2

[0031] 1) Preparation of self-fusing electrode rod

[0032] Take the components in Table 2, with a total weight of 31kg, and prepare a self-melting electrode rod of GH188 cobalt-based superalloy steel ingot with a diameter of φ100mm by vacuum induction melting and casting.

[0033] Table 2 GH188 superalloy ingredient distribution table wt%

[0034] C Si mn La Cr W Ni co 0.099 0.36 0.77 0.21 22.21 14.66 22.27 margin

[0035] 2) Configure electroslag remelting slag system

[0036] Weigh CaF 2 4.14kg, Al 2 o 3 1.2kg, MgO 0.42kg, La 2 o 30.24kg, of which the total amount of impurities is less than 1.5%, and the impurities are unavoidable impurities, including MnO, TiO 2 , CaO, FeO, where MnO≤0.2%, TiO 2 ≤0.2%, CaO≤0.1%, FeO≤0.3%. Configured as an electroslag heavy slag system with a total weight of 6kg.

[0037] 3) Electroslag remelting

[0038] Mix the prepared electroslag remelting slag evenly, bake it at 800°C for 4 hours, use a ...

Embodiment 3

[0042] 1) Preparation of self-fusing electrode rod

[0043] Take the components in Table 3, with a total weight of 31kg, and prepare a self-melting electrode rod of GH188 cobalt-based superalloy steel ingot with a diameter of φ100mm by vacuum induction melting and casting.

[0044] Table 3 GH188 superalloy ingredient distribution table wt%

[0045] C Si mn La Cr W Ni co 0.099 0.36 0.77 0.21 22.21 14.66 22.27 margin

[0046] 2) Configure electroslag remelting slag system

[0047] Weigh CaF 2 4.2kg, Al 2 o 3 1.08kg, MgO 0.54kg, La 2 o 3 0.18kg, of which the total amount of impurities is less than 1.5%, and the impurities are unavoidable impurities, including MnO, TiO 2 , CaO, FeO, where MnO≤0.2%, TiO 2 ≤0.2%, CaO≤0.1%, Fe0≤0.3%. Configured as an electroslag heavy slag system with a total weight of 6kg.

[0048] 3) Electroslag remelting

[0049] Mix the prepared electroslag remelting slag evenly, bake it at 800°C for 4 hours, use ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

An electroslag remelting slag system of cobalt-based high temperature alloy comprises, by weight, 65-75% of CaF2, 15-25% of Al2O3, 5-10% of MgO, 2-8% of La2O3, and below 1.5% of impurities. The cobalt-based high temperature alloy prepared by using slag system electroslag remelting has the advantages of low oxygen content, few nonmetal inclusions, great reduction of the burning loss rate of rare earth element La, uniform components, accurate content of the rare earth element, and effectively guaranteed high-temperature oxidation resistance and durability.

Description

technical field [0001] The invention relates to the field of cobalt-based superalloy smelting, in particular to an electroslag remelting slag system of a cobalt-based superalloy. Background technique [0002] Cobalt-based superalloys are austenitic superalloys containing 40-65% cobalt. It has certain high temperature strength, good thermal corrosion resistance and oxidation resistance under the condition of 730-1100 °C, especially above 1000 °C, it shows excellent thermal corrosion resistance compared with other high temperatures. It is suitable for making guide vanes and nozzle guide vanes of aviation jet engines, industrial gas turbines, ship gas turbines and diesel engine nozzles. [0003] Cobalt-based superalloys containing rare earth elements such as GH188 alloy, the alloy contains a trace amount of rare earth element La, which can improve the process performance of the alloy such as forming, and improve the compactness, continuity, stability and adhesion of the alloy ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C22B9/18C22C30/00
CPCC22B9/18C22C19/07C22C30/00
Inventor 王宏张十庆张登友刘洋罗炯邹兴政何钦生杨百炼赵安中李方唐锐王东哲刘庆宾
Owner CHONGQING MATERIALS RES INST