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A kind of high heat conduction high-strength co-fe-ni alloy for mold and additive manufacturing method thereof

A co-fe-ni, additive manufacturing technology, applied in the field of high thermal conductivity and high strength Co-Fe-Ni alloy and its additive manufacturing for molds, can solve the problems of strength and fatigue life that cannot meet the needs of mold use, and improve Thermal conductivity and service reliability, considerable economic benefits, and the effect of increasing costs

Active Publication Date: 2021-07-30
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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  • A kind of high heat conduction high-strength co-fe-ni alloy for mold and additive manufacturing method thereof
  • A kind of high heat conduction high-strength co-fe-ni alloy for mold and additive manufacturing method thereof
  • A kind of high heat conduction 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: milling + printing (laser power 130W, scanning speed 0.72m / s, layer thickness 38μm) + tempering at 525°C for 2h.

[0043] Print Quality: Porosity 0.19%, Density 99.39%.

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

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

[0046] specifically:

[0047] In this example:

[0048] Co-Fe-Ni alloy with high thermal conductivity and high strength for mold, by weight percentage, its chemical composition is as follows:

[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 mold comprises the following steps:

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

Embodiment 2

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

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

[0061] Print Quality: Porosity 0.19%, Density 99.39%.

[0062] Microstructure: image 3 As shown, equiaxed grains.

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

[0064] More specifically:

[0065] Co-Fe-Ni alloy with high thermal conductivity and high strength for mold, by weight percentage, its chemical composition is as follows:

[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 mold comprises the following steps:

[0068] S1: According to the above composition ratio, the high-temperature molt...

Embodiment 3

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

[0076] Process: powder making + printing (laser power 130W, scanning speed 0.72m / s, layer thickness 38μm) + critical tempering in two-phase region at 700°C for 1h-quenching + tempering at 525°C for 2h.

[0077] Print Quality: Porosity 0.19%, Density 99.39%.

[0078] Microstructure: Figure 4 As shown, the γ phase is diffusely distributed in the layered structure of cellular grains + columnar grains

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

[0080] More specifically:

[0081] Co-Fe-Ni alloy with high thermal conductivity and high strength for mold, by weight percentage, its chemical composition is as follows:

[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 mold compr...

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Abstract

The invention relates to a high thermal conductivity and high-strength Co-Fe-Ni alloy for a mold and its additive manufacturing method. According to the weight percentage, its chemical composition is as follows: C 0-0.01%, Ni 12-18%, Fe 38-42% , Cr 0‑1.2%, X 0‑0.05%, P<0.015%, S<0.010%, the balance is Co and unavoidable impurities; where X=Sc, and / or Y, and / or Nd, and / or or Pd. Compared with the prior art, the present invention applies Co-based medium-entropy alloys to molds, utilizes additive manufacturing and subsequent heat treatment to adjust and control different strength and toughness combinations, and maintains the same level of existing mold steel without greatly increasing costs. Under the premise of mechanical properties, the thermal conductivity and service reliability of the alloy are improved, and it can replace some of the current mold steels, which 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 big mold consumption country, not a manufacturing powerhouse. Some domestic molds have unstable performance and low life reliability, resulting in most high-end molds still relying on imports. Therefore, it is imminent to solve the "stuck neck" problem of my country's high-end mold manufacturing and 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 of combining mold smelting-forging-heat treatment-machining-surface treatment...

Claims

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Application Information

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Patent Type & Authority Patents(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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