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GH4738 nickel base superalloy casting ingot homogenization treatment method

A nickel-based superalloy and homogenization treatment technology is applied in the field of thermal processing of nickel-based deformed superalloys. The effect of size

Inactive Publication Date: 2013-09-04
BC P INC CHINA NAT PETROLEUM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, in the actual production of GH4738 alloy, due to the unreasonable homogenization system, etc., cracks and unqualified microstructures of turbine disc forgings occur from time to time. It is urgent to conduct in-depth homogenization treatment process research on this alloy material ingot.

Method used

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  • GH4738 nickel base superalloy casting ingot homogenization treatment method
  • GH4738 nickel base superalloy casting ingot homogenization treatment method
  • GH4738 nickel base superalloy casting ingot homogenization treatment method

Examples

Experimental program
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Effect test

Embodiment 1

[0027] The preparation of GH4738 nickel-based superalloy includes the following processes, raw material preparation→vacuum induction melting→casting into Φ520mm electrode rod→electrode cutting and surface grinding→electroslag remelting into Φ660mm ingot shape→4kt fast forging to Φ520mm electrode rod→electrode Head cutting, surface grinding→vacuum self-consumption melting Φ610mm self-consumption ingot→consumable ingot homogenization and peeling treatment→4k ton fast forging machine upsetting to Φ620mm→lathe peeling to 600mm cylinder→ultrasonic flaw detection→cutting and flat head→test performance → Storage.

[0028] In order to effectively solve the segregation problem and effectively control the excessive growth of crystal grains, the present invention adopts the following processing methods when manufacturing GH4738 alloy steel ingots:

[0029] A). Raw material preparation

[0030] Raw material ratio (mass percentage) C: 0.02-0.08; Al: 1.2-1.6; Ti: 2.75-3.25; Co: 12.0-15.0; ...

Embodiment 2

[0049] This example proposes a nickel-based superalloy homogenization treatment method, and obtains a better ingot. The difference between the homogenization process and Example 1 is that the preparation of GH4738 nickel-based superalloy includes the following process, raw material preparation→vacuum Induction melting→casting into Φ480mm electrode rod→electrode cutting and surface grinding→electroslag remelting into Φ508mm ingot shape→4kt rapid forging to Φ450mm electrode rod→electrode cutting and surface grinding→vacuum consumable melting Φ508mm consumable ingot→ Homogenization and peeling of consumable ingots → upsetting and drawing of 4kt fast forging machine to Φ480mm → lathe peeling to 450mm cylinder → ultrasonic flaw detection → cutting and flattening → testing performance → storage. After testing, in this example, by adopting the homogenization treatment method of the present invention, an alloy steel ingot with uniform composition and structure can be obtained, and at t...

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Abstract

The invention provides a nickel base superalloy casting ingot homogenization treatment method, and relates to a GH4738 superalloy casting ingot homogenization treatment process. In the existing GH4738 casting ingot, a large amount of casting state dendrite structures exist, homogenization can cause a large size of the grain, and other problems exist, such that the subsequent cogging forging forming is not easily achieved. A purpose of the present invention is to solve the problems in the prior art. The homogenization treatment method is carrying out an annealing treatment in an annealing furnace, wherein an annealing treatment temperature is 1160-1200 DEG C, and an annealing time is 20-50 h. With the technical scheme of the present invention, problems of element segregation, existing of a large amount of dendrites, large grain and the like can be effectively solved, and an alloy segregation degree can be improved at a maximum so as to establish a foundation for the subsequent cogging forging forming. The nickel base superalloy casting ingot homogenization treatment method can be used for homogenization treatments of GH4738 nickel base superalloys with different casting ingot sizes.

Description

technical field [0001] The invention relates to a thermal processing technology of a nickel-based deformed superalloy, in particular to a method for homogenizing a GH4738 nickel-based superalloy casting ingot. Background technique [0002] GH4738 nickel-based superalloy is prone to component segregation due to its high degree of alloying. The addition of a large number of alloying elements and trace elements will cause dendrite segregation in the alloy during solidification, and precipitates such as (g+γ￠) eutectic phase, η Phase or μ equal harmful brittle phase. These phases often become the source of crack initiation during hot working[L Zheng, C Q Gu, Y R Zheng. Investigation of the solidification behavior of a new Ru-containing cast Ni-base superalloy with high W content [J]. Scripta Materialia , 2004(50): 435-439.]. Therefore, before hot working, the ingot must be homogenized to dissolve the second phase in the alloy, reduce or even eliminate element segregation, so a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/10
Inventor 姚志浩董建新张麦仓
Owner BC P INC CHINA NAT PETROLEUM CORP
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