Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A process for preparing advanced ultra-supercritical heat-resistant 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 pure metals

Active Publication Date: 2019-04-05
NORTHEASTERN UNIV LIAONING
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 oxidized elements (such as and Ti) burning loss; but the heat-resistant alloy products prepared by it are prone to surface quality problems such as slag groove wrinkles, and at the same time, harmful elements (such as P, S) in the alloy cannot be effectively eliminated

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A process for preparing advanced ultra-supercritical heat-resistant alloy
  • A process for preparing advanced ultra-supercritical heat-resistant alloy
  • A process for preparing advanced ultra-supercritical heat-resistant 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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a process for preparing advanced ultra-supercritical heat-resistant alloys. The smelting raw materials are configured according to the target components of the advanced ultra-supercritical heat-resistant alloys, wherein an additional 0.01 to 0.04% by weight of carbon is added based on the target carbon content. On the basis of the target aluminum content, add 0.3 to 0.5% more aluminum by weight, use a vacuum induction furnace to smelt under a protective atmosphere to smelt the alloy raw materials into alloy ingots, and use the alloy ingots as consumable electrode base materials. Advanced ultra-supercritical heat-resistant alloys are obtained by electroslag remelting in a protective atmosphere. The process provided by the invention realizes relatively precise control of alloy elements, reduces the oxygen content in the heat-resistant alloy, effectively reduces harmful elements such as P and S through subsequent electroslag remelting under a protective atmosphere, and improves segregation to make the alloy uniform. , improve the density, and obtain advanced ultra-supercritical heat-resistant alloys with less non-metallic inclusions, low sulfur content, dense microstructure and high surface quality.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
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 LIAONING
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com