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Device and method for preparing titanium-containing superalloy hollow steel ingot by electroslag remelting

A technology of electroslag remelting and high-temperature alloys, which is applied in the field of iron and steel metallurgy, can solve problems such as inclusions, alloy composition steel ingot surface quality control bottlenecks, segregation, etc., to improve internal quality and surface quality, smooth inner and outer surface quality, and reduce core The effect of segregation

Inactive Publication Date: 2018-12-18
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in smelting titanium-containing superalloys (w[Ti]>1%), according to the reaction [Ti]+(SiO 2) =(TiO 2 )+[Si], we can see that SiO in slag 2 It will cause a large amount of burning loss of titanium elements in the steel ingot, so that the content of easily oxidizable elements in the entire hollow steel ingot cannot meet the alloy requirements. This method has limitations
Chinese invention patent (publication number: CN102463272A) discloses a technology for preparing hollow steel ingots by centrifugal casting, but the hollow steel ingots prepared by this method have internal looseness, segregation, pores, inclusions and other defects, which seriously reduce the internal quality of superalloy pipes With performance, this method has limitations
[0004] The use of hollow steel ingots as raw materials to produce high-temperature alloy pipes has a wide range of application values, but the alloy composition and surface quality control of high-temperature alloy hollow steel ingots produced by electroslag remelting have always been the bottleneck of this preparation process.

Method used

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  • Device and method for preparing titanium-containing superalloy hollow steel ingot by electroslag remelting
  • Device and method for preparing titanium-containing superalloy hollow steel ingot by electroslag remelting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Such as Figure 1-2 As shown, this embodiment discloses a device for preparing a titanium-containing superalloy hollow steel ingot by electroslag remelting, including an electroslag remelting furnace 2, an inner mold 4, an outer mold 6 and a power supply system. The above-mentioned inner mold 4 and outer mold 6 are all installed on the electroslag remelting furnace 2, corresponding to the hollow steel ingot (containing titanium superalloy) of hollow tubular structure, the above-mentioned inner mold 4 and outer mold 6 are all preferably Hollow cylindrical body structure, the inner crystallizer 4 and the outer mold 6 are arranged coaxially inside and outside, and an annular pouring cavity 8 is formed between them; Describes the electroslag remelting smelting in the cavity, and cooling to form titanium-containing superalloy parts (hollow steel ingots). The use of internal and external combined crystallizers can abandon the ingot extraction link of the traditional ingot-pu...

Embodiment 2

[0058] This example discloses a method for preparing a titanium-containing superalloy by electroslag remelting. The device in Example 1 is used to prepare GH738. The chemical composition of the consumable electrode is shown in Table 1.

[0059] Table 1 Chemical composition of superalloy GH738 consumable electrode

[0060] Grade

C

Cr

co

Mo

Al

Ti

Ni

GH738

0.05

19.2

13.5

4.2

1.4

3.1

Bal

[0061] It includes the following steps:

[0062] (1) Prepare GH738 superalloy consumable electrode groups, 4 electrode groups on the left side and 4 electrode groups on the right side;

[0063] (2) Use the following mass percentage proportioning slag: CaF 2 :59%, CaO:18%, Al 2 o 3 :18%, TiO 2 : 5% of the slag is placed in the slag melting furnace, insert graphite electrodes for slag melting, after the end, pour the high-temperature liquid slag into the annular pouring cavity, insert the self-consumable electrode group, and ...

Embodiment 3

[0070] Using the electroslag remelting device of the above-mentioned embodiment 1 to prepare a titanium-containing superalloy hollow ingot, the following method was adopted to prepare Inconel 740, and the chemical composition of the consumable electrode is shown in Table 3.

[0071] Table 3 Chemical composition of superalloy Inconel 740 consumable electrode

[0072] Grade

C

Cr

co

Nb

Si

Al

Ti

Ni

Inconel740

0.03

25

20

2

0.5

0.9

1.8

Bal

[0073] It specifically includes the following steps:

[0074] (1) Prepare Inconel 740 superalloy consumable electrode groups, with 4 electrodes on the left and 4 electrodes on the right;

[0075] (2) Use the following mass percentage proportioning slag: CaF 2 :59%, CaO:18%, Al 2 o 3 :18%, TiO 2 : 5% of the slag is placed in the slag melting furnace, and graphite electrodes are inserted for slag melting. After the end, the high temperature liquid slag is poured into t...

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Abstract

The invention discloses a device for preparing a titanium-containing superalloy hollow steel ingot by electroslag remelting. The device comprises an electroslag remelting furnace, an inner crystallizer, an outer crystallizer and a power supply system, wherein an annular casting containing cavity is formed between the inner crystallizer and the outer crystallizer; after casting of slag in the annular casting containing cavity, a consumable electrode is heated, melted, cooled and crystallized to form a titanium-containing superalloy piece; and the slag comprises the following components including, by mass (59+ / -5)% of CaF2, (18+ / -2)% of CaO, (18+ / -2)% of Al2O3, (5+ / -3)% of TiO2 or (62+ / -5)% of CaF2, (8+ / -2)% of CaO, (15+ / -3)% of Al2O3, (7+ / -2)% of MgO and (8+ / -3)% of TiO2. The device for preparing a titanium-containing alloy by electroslag remelting eliminates the ingot drawing link (that is, a slag system containing no SiO2 can be adopted), and solves the technical problem of massive burning of titanium element massive burning caused by [Ti]+(SiO2)=(TiO2)+[Si], under the condition of ensuring the surface quality of the hollow steel ingot, the content of easily oxidizable elements meets the requirements of the alloy standard, and the elements are evenly distributed in the axial direction of the casting ingot.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and relates to a device for preparing hollow steel ingots of high-temperature alloys containing titanium by electroslag remelting, and a method for preparing hollow steel ingots of high-temperature alloys containing titanium. Background technique [0002] With the rapid development of my country's aero-engine, gas turbine and petrochemical industries, the performance requirements of various alloy pipes are getting higher and higher, mainly including high-temperature strength, oxidation resistance, corrosion resistance and creep rupture resistance of materials. Traditional materials represented by austenitic heat-resistant steel can no longer meet the further development of the above-mentioned industries. Superalloys are ideal materials for preparing pipes for the above-mentioned fields because of their good creep strength and corrosion resistance. Superalloy refers to a metal ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D23/10
CPCB22D23/10
Inventor 侯栋王德永姜周华李花兵刘福斌曹玉龙屈天鹏王慧华田俊陈开来
Owner SUZHOU UNIV
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