High-heat-conductivity and high-strength Co-Fe-Ni alloy for mold and additive manufacturing method thereof

A technology of co-fe-ni and additive manufacturing, which is applied in the field of high thermal conductivity and high strength Co-Fe-Ni alloys for molds and their additive manufacturing, can solve the problems that the strength and fatigue life cannot meet the needs of molds, and achieve improved Thermal conductivity and service reliability, considerable economic benefits, and the effect of increasing costs

Active Publication Date: 2021-02-02
SHANGHAI ESU LASER TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The applicant of the present invention found that the medium entropy alloy manufactured by this additive has a relatively strict equiatomic ratio, mainly utilizes the solid solution strengthening effect and the "diffusion retardation" effect, without the formation of any intermediate phase, so its strength and fatigue The service life, etc. cannot meet the use requirements of the mold

Method used

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  • High-heat-conductivity and high-strength Co-Fe-Ni alloy for mold and additive manufacturing method thereof
  • High-heat-conductivity and high-strength Co-Fe-Ni alloy for mold and additive manufacturing method thereof
  • High-heat-conductivity and high-strength Co-Fe-Ni alloy for mold and additive manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041]Composition: Co-40.88Fe-15.94Ni (wt.%)

[0042]Process: powder milling + printing (laser power 130W, scanning rate 0.72m / s, layer thickness 38μm) + 525℃ tempering for 2h.

[0043]Print quality: porosity is 0.19%, density is 99.39%.

[0044]Microstructure:figure 2 As shown, the layered structure of cellular crystal grains + columnar crystal grains

[0045]Mechanical properties: Yield strength 1210MPa, tensile strength 1420MPa, elongation rate 6.7%, V-notch room temperature impact energy 10.5J.

[0046]specifically:

[0047]In this embodiment:

[0048]The high thermal conductivity and high strength Co-Fe-Ni alloy used for molds has the following chemical composition by weight percentage:

[0049]Fe 40.88%, Ni 15.94%, P<0.015%, S<0.010%, the balance is Co and unavoidable impurities.

[0050]The additive manufacturing method of high thermal conductivity and high strength Co-Fe-Ni alloy for molds includes the following steps:

[0051]S1: According to the above composition ratio, the high-temperature molten allo...

Embodiment 2

[0059]Composition: Co-40.88Fe-15.94Ni (wt.%)

[0060]Process: pulverizing + printing (laser power 130W, scanning rate 0.72m / s, layer thickness 38μm) + 900°C solid solution for 1h-quenching +525°C tempering for 2h.

[0061]Print quality: porosity is 0.19%, density is 99.39%.

[0062]Microstructure:image 3 Shown, equiaxed grains.

[0063]Mechanical properties: yield strength 1020MPa, tensile strength 1220MPa, elongation 6.2%, V-notch room temperature impact energy 18.3J.

[0064]More specifically:

[0065]The high thermal conductivity and high strength Co-Fe-Ni alloy used for molds has the following chemical composition by weight percentage:

[0066]Fe 40.88%, Ni 15.94%, P<0.015%, S<0.010%, the balance is Co and unavoidable impurities.

[0067]The additive manufacturing method of high thermal conductivity and high strength Co-Fe-Ni alloy for molds includes the following steps:

[0068]S1: According to the above composition ratio, the high-temperature molten alloy is cooled to room temperature by the gas atomiza...

Embodiment 3

[0075]Composition: Co-40.88Fe-15.94Ni (wt.%)

[0076]Process: pulverizing + printing (laser power 130W, scanning rate 0.72m / s, layer thickness 38μm) + 700℃ two-phase zone critical tempering for 1h-quenching +525℃ tempering for 2h.

[0077]Print quality: porosity is 0.19%, density is 99.39%.

[0078]Microstructure:Figure 4 As shown, the cellular crystal grains with dispersed γ phase + the layered structure between columnar crystal grains

[0079]Mechanical properties: yield strength 976MPa, tensile strength 1090MPa, elongation 10.5%, V-notch room temperature impact energy 46.6J.

[0080]More specifically:

[0081]The high thermal conductivity and high strength Co-Fe-Ni alloy used for molds has the following chemical composition by weight percentage:

[0082]Fe 40.88%, Ni 15.94%, P<0.015%, S<0.010%, the balance is Co and unavoidable impurities.

[0083]The additive manufacturing method of high thermal conductivity and high strength Co-Fe-Ni alloy for molds includes the following steps:

[0084]S1: According to ...

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Abstract

The invention relates to a high-heat-conductivity and high-strength Co-Fe-Ni alloy for a mold and an additive manufacturing method thereof. The high-heat-conductivity and high-strength Co-Fe-Ni alloycomprises the following chemical components in percentage by weight: 0-0.01% of C, 12-18% of Ni, 38-42% of Fe, 0-1.2% of Cr, 0-0.05% of X, less than 0.015% of P, less than 0.010% of S and the balanceCo and inevitable impurities, wherein X is equal to Sc, and/or Y, and/or Nd, and/or Pd. Compared with the prior art, the high-heat-conductivity and high-strength Co-Fe-Ni alloy has the advantages thata Co-based medium-entropy alloy is applied to the mold, different toughness combinations are regulated and controlled by utilizing additive manufacturing and subsequent heat treatment, the heat conductivity and the service reliability of the alloy are improved on the premise that the cost is not greatly increased and the same mechanical property of existing mold steel is kept, and the high-heat-conductivity and high-strength Co-Fe-Ni alloy can replace part of the existing mold steel and has considerable economic benefits.

Description

Technical field[0001]The invention relates to an alloy for additive manufacturing of molds, in particular to a high thermal conductivity and high strength Co-Fe-Ni alloy for molds and an additive manufacturing method thereof.Background technique[0002]High-end mold manufacturing is the embodiment of a country's industrial capabilities. my country is a major mold consumer, not a strong manufacturing country. Some domestic molds have unstable performance and low life reliability, which makes most high-end molds still dependent on imports. Therefore, it is extremely urgent to solve the "stuck neck" problem of my country's high-end mold manufacturing and to develop high-end mold materials with independent intellectual property rights and corresponding manufacturing technologies. At the same time, the rapid development of additive manufacturing technology has changed the traditional manufacturing method that combines mold smelting-forging-heat treatment-machining-surface treatment, which ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/07C22C30/00C22C1/04B22F1/00B22F5/00B22F10/25B22F10/28B22F10/64B33Y10/00B33Y70/00
CPCC22C19/07C22C30/00C22C1/0433B22F3/24B22F5/007B33Y10/00B33Y70/00B22F1/065B33Y80/00B22F10/64B33Y40/20B22F2998/10C22F1/10C22F1/002Y02P10/25B22F10/28
Inventor 刘庆冬张依潇王利军顾剑锋
Owner SHANGHAI ESU LASER TECH CO LTD
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