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Composite strengthening and toughening technology of high-tensile Fe-Ni-Cr-based high-temperature corrosion-resisting alloy

A fe-ni-cr, corrosion-resistant alloy technology, applied in the field of forging and heat treatment of high-strength Fe-Ni-Cr-based high-temperature corrosion-resistant alloys, can solve the problems of low mechanical strength, limited popularization and application, and low strength. Achieve the effect of saving process cost, shortening process flow and high strength

Inactive Publication Date: 2016-05-11
HENAN INST OF ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Incoloy925 alloy has good toughness, but its mechanical strength is about 275MPa (40ksi) lower than that of the widely used nickel-based superalloy Inconel718, which limits its further application.

Method used

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  • Composite strengthening and toughening technology of high-tensile Fe-Ni-Cr-based high-temperature corrosion-resisting alloy
  • Composite strengthening and toughening technology of high-tensile Fe-Ni-Cr-based high-temperature corrosion-resisting alloy
  • Composite strengthening and toughening technology of high-tensile Fe-Ni-Cr-based high-temperature corrosion-resisting alloy

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The first step, vacuum induction smelting: Fe-Ni-Cr alloy ingots meeting the requirements of Table 2 were prepared by alloy proportioning and vacuum induction smelting, using ZG-0.05 50kg vacuum induction furnace, vacuum degree 0.1Pa, pouring temperature control At 1440°C, it is directly cast into an electrode rod in vacuum, weighing 50kg.

[0038] Table 2 Example 1 Fe-Ni-Cr alloy composition range

[0039]

[0040] The second step, electroslag remelting: After the alloy electrode rod is ground and trimmed, electroslag remelting is carried out in a double-arm electroslag furnace. The diameter of the alloy electroslag remelting ingot is generally controlled at φ400mm.

[0041] The third step is high-temperature diffusion annealing: the alloy electroslag ingot is heated up with the furnace, the annealing temperature is selected at 1167°C, and the holding time is 1h.

[0042] The fourth step, forging: use a high temperature of 1161°C to open the billet, and then approp...

Embodiment 2

[0045] The first step, vacuum induction melting: Fe-Ni-Cr alloy ingots meeting the requirements of Table 3 were prepared by alloy proportioning and vacuum induction melting, using ZG-0.05 50kg vacuum induction furnace, vacuum degree 0.1Pa, pouring temperature control At 1450°C, it is directly cast into an electrode rod in vacuum, weighing 50kg.

[0046] Table 3 Example 2 Fe-Ni-Cr alloy composition range

[0047]

[0048] The second step, electroslag remelting: After the alloy electrode rod is ground and trimmed, electroslag remelting is carried out in a double-arm electroslag furnace. The diameter of the alloy electroslag remelting ingot is generally controlled at φ400mm.

[0049] The third step is high-temperature diffusion annealing: the alloy electroslag ingot is heated up with the furnace, the annealing temperature is selected at 1164°C, and the holding time is 1h.

[0050] The fourth step, forging: use a high temperature of 1157°C to open the billet, and then appropri...

Embodiment 3

[0053] The first step, vacuum induction melting: Fe-Ni-Cr alloy ingots meeting the requirements of Table 4 were prepared by alloy proportioning and vacuum induction melting, using ZG-0.05 50kg vacuum induction furnace, vacuum degree 0.1Pa, pouring temperature control At 1460°C, it is directly cast into an electrode rod in vacuum, weighing 50kg.

[0054] Table 4 Example 3 Fe-Ni-Cr alloy composition range

[0055]

[0056] The second step, electroslag remelting: After the alloy electrode rod is ground and trimmed, electroslag remelting is carried out in a double-arm electroslag furnace. The diameter of the alloy electroslag remelting ingot is generally controlled at φ400mm.

[0057] The third step is high-temperature diffusion annealing: the alloy electroslag ingot is heated up with the furnace, the annealing temperature is selected at 1158°C, and the holding time is 1h.

[0058] The fourth step, forging: use a high temperature of 1154°C to open the billet, and then appropri...

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Abstract

The invention discloses a composite strengthening and toughening technology of a high-tensile Fe-Ni-Cr-based high-temperature corrosion-resisting alloy. According to the composite strengthening and toughening technology, beneficial microelements are controlled by the compounding ratio of alloy components and the matching of specific vacuum-induction melting and an electro slag remelting duplex smelting technology, then a composite strengthening and toughening technique is adopted, namely isothermal controlled forging is adopted, forged meta-stable-state tissues are reserved in the alloy through quick cooling, and ageing strengthening is directly adopted. According to the composite strengthening and toughening technology disclosed by the invention, the corrosion resisting property of the Fe-Ni-Cr alloy is guaranteed, besides, the impact toughness (especially low-temperature impact toughness) of the alloy, the room-temperature tensile strength of the alloy, and the yield strength of the alloy can achieve a high level, and the combination property of the alloy disclosed by the invention is superior to that of the Incoloy925 alloy regulated by the American ASTM technical standard.

Description

technical field [0001] The invention relates to the technical field of heat treatment of high-strength high-temperature corrosion-resistant alloys, in particular to a forging and heat-treatment process of high-strength Fe-Ni-Cr-based high-temperature corrosion-resistant alloys for the development and application of sour oil and gas. Background technique [0002] Fe-Ni-Cr-based alloy (Incoloy925 is representative of the same kind in foreign countries) is an aging-strengthened high-strength high-temperature corrosion-resistant alloy. The traditional strengthening process of Fe-Ni-Cr based high-temperature corrosion-resistant alloys is solid solution + aging strengthening treatment. The purpose of solution treatment is to obtain a uniform supersaturated solid solution and control the grain size. The purpose of aging treatment is to make the strengthening phase (carbide, intermetallic compound) fully and uniformly precipitate, and the aging temperature should ensure the particl...

Claims

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Application Information

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IPC IPC(8): C22C30/02C22C30/04C22C1/02C22F1/10
CPCC22C30/02C22C1/023C22C19/055C22C19/056C22C30/04C22F1/10
Inventor 张玉碧李飞亚张俊晖赵永涛汤安
Owner HENAN INST OF ENG
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