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A kind of Fe-Ni based casting superalloy and preparation method thereof

A high-temperature alloy, fe-ni technology, applied in the direction of mechanical equipment, machines/engines, engine components, etc., can solve the problems of high cost, reduced strength, insufficient tensile strength, etc., and achieve the effect of improving plastic toughness and high temperature strength

Active Publication Date: 2019-10-22
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Commonly used materials for turbochargers are Fe-based alloys, Ni-based superalloys, TiAl alloys and heat-resistant ceramic materials. Although TiAl alloys and heat-resistant ceramic materials have low density, their cost is high and their shapes cannot be fully optimized. limit
At present, Fe-based alloys that are widely used in research and application include heat-resistant steels such as 12YWT, 14YWT, MA956, and MA957. Their room temperature strength is very high. When the temperature exceeds 600°C, the strength drops sharply. At 800°C, the tensile strength has already reached Less than 200MPa, so the temperature range of Fe-based alloys is 500-700°C, which is not suitable for high-temperature automotive turbochargers
The results show that compared with the unheated alloy, the plasticity of the alloy after overaging heat treatment is increased by 50%, but the strength is reduced by 20%

Method used

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  • A kind of Fe-Ni based casting superalloy and preparation method thereof
  • A kind of Fe-Ni based casting superalloy and preparation method thereof
  • A kind of Fe-Ni based casting superalloy and preparation method thereof

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preparation example Construction

[0039] The present invention also provides a method for preparing a nano-TiC particle toughened Fe-Ni-based cast superalloy for manufacturing a turbocharger for a vehicle, specifically comprising the following steps:

[0040] Step 1: Use graphite microflakes with a particle size of 20-30 microns and a thickness of about 10-20 layers as a carbon source, and pre-mix on a ball mill at a speed of 200 rpm for 30 minutes.

[0041] Step 2: Weigh the graphite flakes, Ti powder and Fe powder in proportion, wherein the molar ratio of the graphite flakes to the Ti powder is 1:1, and the total mass percentage of the graphite flakes and the Ti powder is 20-40%.

[0042] Step 3: put the mixed alloy powder of the graphite flakes, Ti powder and Fe powder into a ball mill, and mix for 48 hours at a speed of 50 rpm.

[0043] Step 4: Place a certain mass of ball-milled mixed alloy powder in aluminum foil, and press it into a cylindrical compact with a diameter of 25 mm and a height of 30 mm.

...

Embodiment 1

[0057] A nano-TiC particle toughened Fe-Ni-based superalloy used in the manufacture of automotive turbochargers, its main chemical composition is by mass percentage: C: 0.037%; Cr: 11.69%; Ni: 42.98%; W: 7.03 %; Al: 1.92%; Ti: 4.36%; Fe: I; B: 0.12%; Si: 0.29%; Mn: 0.18%; S: 0.009%;

[0058] Its preparation method comprises the following steps:

[0059] Step 1: Use graphite microflakes with a particle size of 20-30 microns and a thickness of about 10-20 sheets as a carbon source, and pre-mix on a ball mill at a speed of 200 rpm for 30 minutes.

[0060] Step 2: Weigh the graphite flakes, Ti powder and Fe powder in proportion, wherein the molar ratio of the graphite flakes to the Ti powder is 1:1, and the total mass percentage of the graphite flakes and the Ti powder is 30%.

[0061] Step 3: Put the weighed alloy powder into a ball mill and mix for 48 hours at a speed of 50 rpm.

[0062] Step 4: Place a certain mass of mixed alloy powder in aluminum foil and press it into a cy...

Embodiment 2

[0070] A nano-TiC particle toughened Fe-Ni-based superalloy for manufacturing a turbocharger for vehicles, the main chemical composition of which is by mass percentage: C: 0.043%; Cr: 12.07%; Ni: 44.59%; W: 6.76 %; Al: 2.32%; Ti: 4.63%; Fe: I; B: 0.10%; Si: 0.25%; Mn: 0.19%; S: 0.008%;

[0071] Its preparation method comprises the following steps:

[0072] Step 1: Use graphite microflakes with a particle size of 20-30 microns and a thickness of about 10-20 sheets as a carbon source, and pre-mix on a ball mill at a speed of 200 rpm for 30 minutes.

[0073] Step 2: Weigh the graphite flakes, Ti powder and Fe powder in proportion, wherein the molar ratio of the graphite flakes to the Ti powder is 1:1, and the total mass percentage of the graphite flakes and the Ti powder is 30%.

[0074] Step 3: Put the weighed alloy powder into a ball mill and mix for 48 hours at a speed of 50 rpm.

[0075] Step 4: Place a certain mass of mixed alloy powder in aluminum foil and press it into a...

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Abstract

The invention discloses a nano TiC particle toughened Fe-Ni base cast superalloy for manufacturing a vehicular turbosupercharger. The nano TiC particle toughened Fe-Ni base cast superalloy comprises the following chemical components of, by mass percent, less than or equal to 0.10% of C, 11.00-16.00% of Cr, 34.00-45.00% of Ni, 4.00-8.00% of W, 1.80-2.40% of Al, 3.00-5.00% of Ti, 0.01-0.30% of TiC and the balance Fe. According to the nano TiC particle toughened Fe-Ni base cast superalloy for manufacturing the vehicular turbosupercharger, a nano TiC particle modificator is endogenously added to the nano TiC particle toughened Fe-Ni base cast superalloy for toughening a Fe-Ni base cast superalloy. The invention further provides a preparation method of the nano TiC particle toughened Fe-Ni basecast superalloy for manufacturing the vehicular turbosupercharger. A nano TiC iron base intermediate alloy is added to a Fe-Ni base superalloy melt, so that the endogenous nano TiC ceramic particle modificator toughened Fe-Ni base superalloy is obtained, and the plasticity and toughness of the Fe-Ni base cast superalloy are improved on the premise of ensuring the strength of the Fe-Ni base cast superalloy.

Description

technical field [0001] The invention relates to the field of preparation of high-temperature alloys, more specifically, the invention relates to a nano-TiC particle toughened Fe-Ni-based cast high-temperature alloy used for manufacturing a turbocharger for vehicles and a preparation method thereof. Background technique [0002] The turbocharging technology for vehicles uses the exhaust gas from the engine to drive the turbine, and then the turbine drives the centrifugal press to achieve supercharging. The general operating temperature of the turbocharger for vehicles is 650°C-950°C, the high pressure ratio reaches 3.3MPa, and the maximum speed has reached 300,000r / min. Under such high-speed, high-temperature and high-pressure conditions, turbocharger components are subjected to a series of effects such as centrifugal force, pneumatic pressure, corrosion, oxidation, and resonance, and are particularly prone to cracks and fractures. Therefore, for the safety and reliability of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/10C22C30/00C22C35/00C22F1/10F01D25/00
Inventor 赵庆龙刘正鲁姜启川邱丰
Owner JILIN UNIV
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