Vacuum induction melting and casting process for GH4151 alloy, and ingot mould device

A technology of vacuum induction smelting and vacuum induction furnace, which is applied in the field of alloy smelting, can solve the problems of unreasonable vacuum induction casting process, less research on cracking control, and affecting the process, so as to improve the nucleation rate, reduce the solidification thermal stress, The effect of reducing segregation

Active Publication Date: 2021-06-18
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to the special material properties of the alloy and the unreasonable vacuum induction casting process, obvious transverse cracks, longitudinal cracks and central cracks often appear in the ingots for vacuum induction melting. This is a serious irreversible casting defect that affects the subsequent processes. conduct
Even during the solidification process of the ingot, the formation of concentric cracks leads to the scrapping of the entire ingot
At present, research on cracking control of difficult-to-deform superalloys mainly focuses on forging and heat treatment processes, while research on cracking control of vacuum induction melting and casting processes is less

Method used

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  • Vacuum induction melting and casting process for GH4151 alloy, and ingot mould device
  • Vacuum induction melting and casting process for GH4151 alloy, and ingot mould device
  • Vacuum induction melting and casting process for GH4151 alloy, and ingot mould device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] use figure 1 The ingot mold device shown melts and casts the GH4151 alloy. The formwork of the device is made of ductile iron, and the outer diameter of the formwork is 800mm. The device adopts rock wool as the material of the thermal insulation riser. The diameter of the thermal insulation riser is 1200mm and the height is 500mm. The electromagnetic stirring device of described device is three pairs of induction coils, the first induction coil 40 and the second induction coil 43, the third induction coil 41 and the fourth induction coil 44, the fifth induction coil 42 and the sixth induction coil 45, and Each pair of coils is connected in series as a connection terminal for three-phase alternating current.

[0056] The vacuum induction melting casting process of GH4151 alloy is as follows:

[0057] (1) In terms of mass percentage, GH4151 alloy contains: 0.06%C, 14.5%Co, 11%Cr, 4.5%Mo, 3%W, 0.007%B, 0.02%Zr, 0.55%V, 2.82%Ti, 3.9% Al, 3.28%Nb, Ni;

[0058] (2) Wash ...

Embodiment 2

[0065] Example 2 is basically the same as Example 1, except that in step (1), the GH4151 alloy contains 0.06%C, 14.5%Co, 11%Cr, 4.5%Mo, 3.4%W in terms of mass percentage , 0.007%B, 0.02%Zr, 0.55%V, 3.03%Ti, 3.9%Al, 3.28%Nb, Ni;

[0066] In step (3), the temperature of the alloy melt is 1420°C;

[0067] In step (4), the flow rate of argon gas filling is 215mL / min, and the filling time is 10min.

[0068] In step (5), the casting speed is 13kg / s, and the total casting time is 3.5min.

[0069] The segregation coefficients of Ti, Nb and Mo are shown in Table 1.

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Abstract

The invention relates to a vacuum induction melting and casting process for GH4151 alloy, and an ingot mould device. The device comprises a mold shell (3) which is cylindrical and provided with a cavity body (1) for accommodating an alloy cast ingot, an insulated feeder (2) which is in the shape of a truncated hollow cone and connected to one end of the mold shell (3) in a sleeving manner, and an electromagnetic stirring device (4) which is cylindrical and connected to the position, where the insulated feeder is not arranged, of the mold shell (3) in a sleeving manner. According to the used process and device, segregation can be effectively reduced, internal stress in an alloy solidification process is reduced, the alloy strength is improved, and therefore cracks are prevented from being generated.

Description

technical field [0001] The invention relates to the technical field of alloy smelting, in particular to a vacuum induction melting casting process and an ingot mold device for a GH4151 alloy. Background technique [0002] GH4151 alloy is an advanced hard-to-deform superalloy strengthened by γ' phase precipitation. It has excellent fatigue resistance, creep resistance and corrosion resistance. It is often used to make aero-engine turbine disks. GH4151 has a very high degree of alloying, in which the content of aging precipitation strengthening elements (Al+Ti+Nb) is as high as 10 wt.%, and the volume fraction of the main strengthening phase γ' is higher than 45%, which is the highest among wrought alloys; in addition, a large amount of added solid The solution-strengthening elements Cr, Co, Mo, W, etc. make the strength of the alloy at room temperature up to 1700MPa. However, due to the addition of a large number of strengthening elements, severe segregation of the alloy occ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D7/00B22D7/06B22D7/10B22D7/12C22C19/05C22C1/02
CPCB22D7/005B22D7/068B22D7/106B22D7/12C22C1/023C22C19/056
Inventor 杨树峰杨曙磊徐志强高锦国赵朋刘威贾雷王宁周杨
Owner UNIV OF SCI & TECH BEIJING
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