A Vacuum Induction Melting Casting Process and Ingot Mold Device for gh4151 Alloy

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: 2021-07-30
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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  • A Vacuum Induction Melting Casting Process and Ingot Mold Device for gh4151 Alloy
  • A Vacuum Induction Melting Casting Process and Ingot Mold Device for gh4151 Alloy
  • A Vacuum Induction Melting Casting Process and Ingot Mold Device for gh4151 Alloy

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 process for vacuum induction melting and casting of GH4151 alloy and an ingot mold device. The device includes: a mold shell (3), the mold shell (3) is cylindrical and has a cavity (1) for accommodating an alloy ingot; a thermal insulation riser (2), and the thermal insulation riser ( 2) The shape is a truncated hollow cone, and it is sleeved on one end of the mold shell (3); the electromagnetic stirring device (4), the electromagnetic stirring device (4) is cylindrical and sleeved on the mold shell (3) ) without arranging the position of the insulation riser. The process and device used in the invention can effectively reduce segregation, reduce internal stress in the solidification process of the alloy, improve the strength of the alloy, and thus prevent the generation of cracks.

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 Patents(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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