Technique for preparing advanced ultra-super critical heat-resisting alloy

An ultra-supercritical, heat-resistant alloy technology, applied in the field of heat-resistant alloy smelting, can solve the problem that harmful elements cannot be effectively eliminated, and achieve the effects of dispersed inclusions, small inclusions, and reduced burning loss

Active Publication Date: 2017-12-26
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Foreign researchers prepare advanced ultra-supercritical heat-resistant alloys using a vacuum induction furnace and vacuum self-consumption dual process. The feature of this process is to strictly control the oxygen content in the smelting environment and avoid easily

Method used

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  • Technique for preparing advanced ultra-super critical heat-resisting alloy
  • Technique for preparing advanced ultra-super critical heat-resisting alloy
  • Technique for preparing advanced ultra-super critical heat-resisting alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] In view of the requirements of advanced ultra-supercritical conditions on the purity of materials for heat-resistant alloys, the inventors have confirmed through a large number of experiments that the use of vacuum induction furnace melting to achieve more precise control of alloy elements, and the use of a protective atmosphere of argon to isolate oxygen to prevent Burning of easily oxidized elements during smelting, by adding excessive carbon and aluminum, the oxygen content in heat-resistant alloys can be effectively reduced, and harmful elements such as P and S can be effectively reduced through subsequent electroslag remelting under a protective atmosphere, and segregation can be improved It makes the alloy uniform and improves the compactness, thus establishing a new process of advanced ultra-supercritical heat-resistant alloy.

[0034] It mainly uses vacuum induction furnace and protective atmosphere electroslag remelting to smelt advanced ultra-supercritical heat...

Embodiment 2

[0050] The smelting equipment used in this embodiment is a 30kg vacuum induction furnace and a 50kg protective atmosphere electroslag remelting furnace. Among them, the ultimate vacuum degree of the vacuum induction furnace is 0.1Pa, the rated power of the power supply is 50kW, and the furnace loading capacity is 20.0kg to 21.5kg; The weight of the consumption electrode is 25kg~50kg.

[0051] The main components of the smelting raw materials used in this example are shown in Table 1.

[0052] Table 1 Main components of smelting raw materials / wt%

[0053]

[0054]

[0055] Vacuum induction furnace and protective atmosphere electroslag remelting are used to smelt the advanced ultra-supercritical heat-resistant alloy Inconel740H. The control range and target of the alloy composition are shown in Table 2, and the content in the table is the weight percentage.

[0056] Table 2 Inconel740H alloy composition control range and target / wt.%

[0057]

[0058] Specific steps a...

Embodiment 3

[0076] This example is an advanced ultra-supercritical heat-resistant alloy GH4700 prepared on the basis of Example 2, and its target composition control is shown in Table 5.

[0077] Table 5 GH4700 alloy target composition control / wt.%

[0078]

[0079] 1) Vacuum induction furnace melting stage:

[0080] (1) Ingredients and charging: ingredients according to alloy requirements, smelting raw materials and their quality are specifically nickel 10206.18g, chromium 5037.27g, cobalt 4002.00g, molybdenum 100.09g, niobium 300.91g, electrolytic manganese 63.91g, silicon 2.11g, carbon 7.91g, aluminum 309.09g, sponge titanium 316.45g. Among them, carbon and aluminum particles are added 0.03% and 0.3% respectively on the basis of the target composition for deoxidation. The furnace metal is added in sequence: nickel, cobalt, molybdenum, chromium, and niobium; the alloys that are added to the hopper in sequence include: carbon, deoxidizer aluminum, alloyed aluminum, silicon, titanium...

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Abstract

The invention relates to a technique for preparing an advanced ultra-super critical heat-resisting alloy. According to the technique, smelting raw materials are prepared according to target components of the advanced ultra-super critical heat-resisting alloy, wherein by weight, 0.01-0.04% of carbon is added on the basis of the target carbon content, and 0.3-0.5% of aluminum is added on the basis of the target aluminum content; and the alloy raw materials are smelted into an alloy ingot under the protective atmosphere through a vacuum induction furnace, the alloy ingot serves as a self-consumption electrode base material, and the advanced ultra-super critical heat-resisting alloy is obtained through electro-slag remelting under the protective atmosphere. According to the technique for preparing the advanced ultra-super critical heat-resisting alloy, accurate control over alloy elements is achieved, the oxygen content in a low-heat-resisting alloy is decreased, the harmful elements such as P and S are effectively reduced through subsequent electro-slag remelting under the protective atmosphere, and segregation is overcome, so that the alloy is uniform, and compactness is improved; and the advanced ultra-super critical heat-resisting alloy which is few in non-metallic inclusions, low in sulphur content, compact in organization structure and high in surface quality is obtained.

Description

technical field [0001] The invention relates to the technical field of heat-resistant alloy smelting, in particular to a process for preparing an advanced ultra-supercritical heat-resistant alloy. Background technique [0002] The development of advanced ultra-supercritical power generation technology can improve the thermal efficiency of thermal power units in power plants, [0003] reduce CO 2 emissions. In the face of the durability, high temperature corrosion resistance and fatigue resistance required by advanced ultra-supercritical materials, traditional ferritic heat-resistant steel and austenitic heat-resistant steel can no longer meet these conditions. Nickel-based heat-resistant alloys are important candidate materials for a new generation of advanced ultra-supercritical power plants due to their longer creep fatigue cycle and better corrosion resistance. [0004] The purity of heat-resistant alloy smelting is the guarantee of the good performance of the material...

Claims

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Application Information

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IPC IPC(8): C22C19/05C22C30/00C22C1/02
CPCC22C1/023C22C19/055C22C19/058C22C30/00
Inventor 耿鑫姜周华牛增辉李花兵师帅李星
Owner NORTHEASTERN UNIV
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