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Alloy composition and preparation method of a low-cobalt superalloy turbocharger

A supercharged turbine and high-temperature alloy technology, applied in the direction of casting mold composition, casting molding equipment, metal processing equipment, etc., can solve problems such as high cost, to prevent dislocation cross-slip, reduce alloy stacking fault energy, and improve deformation The effect of resistance

Active Publication Date: 2020-10-27
JIANGYIN UNI POL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Co element is a strategic scarce resource, and a large amount of addition brings extremely high costs

Method used

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  • Alloy composition and preparation method of a low-cobalt superalloy turbocharger

Examples

Experimental program
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Effect test

Embodiment 1

[0031] The actual measured components of the turbocharger in this embodiment are shown in Table 1. The preparation steps are as follows:

[0032] (1) During the batching process of the master alloy before smelting, the burning loss rate of Al, Ti, and B elements must be considered to be 0.3, 0.2, and 0.5 respectively. After batching, it is added to a vacuum induction furnace for smelting. The smelting process includes melting, refining, and alloying and pouring; first put nickel, chromium, molybdenum, tungsten, tantalum, cobalt, and carbon into the crucible, and then refine it for 35 minutes after refining. After smelting aluminum and titanium for 10 minutes, stir the alloy liquid melt, pour into argon, add boron for 5 minutes and stir the alloy liquid melt to make the ingredients uniform; finally, power off and cool down to make the melt temperature reach the pouring temperature before pouring, pouring The temperature is 1500-1570°C, electrified casting and filtering the all...

Embodiment 2

[0040] The actual measured components of the turbocharger in this embodiment are shown in Table 1. The preparation steps are as follows: (1) In the batching process of the master alloy before smelting, the burning loss rates of Al, Ti, and B elements must be considered to be 0.3, 0.2, and 0.5 respectively. After batching, they are added to a vacuum induction furnace for smelting. Refining, alloying and pouring; first put nickel, chromium, molybdenum, tungsten, tantalum, cobalt, and carbon into the crucible, and then refine for 35 minutes after refining. After refining, stir the alloy liquid melt, and then turn off the power to cool down to make the alloy liquid conjunctiva; Re-energize, add aluminum and titanium and smelt for 10 minutes, stir the alloy liquid melt, pour in argon, add boron for 5 minutes and stir the alloy liquid melt to make the ingredients uniform; finally, power off and cool down to make the melt temperature reach the pouring temperature Carry out pouring, t...

Embodiment 3

[0048] The actual measured components of the turbocharger in this embodiment are shown in Table 1. The preparation steps are as follows: (1) In the batching process of the master alloy before smelting, the burning loss rates of Al, Ti, and B elements must be considered to be 0.3, 0.2, and 0.5 respectively. After batching, they are added to a vacuum induction furnace for smelting. Refining, alloying and pouring; first put nickel, chromium, molybdenum, tungsten, tantalum, cobalt, and carbon into the crucible, and then refine for 35 minutes after refining. After refining, stir the alloy liquid melt, and then turn off the power to cool down to make the alloy liquid conjunctiva; Re-energize, add aluminum and titanium and smelt for 10 minutes, stir the alloy liquid melt, pour in argon, add boron for 5 minutes and stir the alloy liquid melt to make the ingredients uniform; finally, power off and cool down to make the melt temperature reach the pouring temperature Carry out pouring, t...

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Abstract

The invention discloses an alloy component of a low-cobalt high-temperature alloy supercharging turbine. The chemical composition of the alloy comprises the following chemical elements by mass percentage: 0.08-0.16% of C, 12.00-15.00% of Cr, 5.00-7.00% of Mo, 1.00-3.00% of Co, 5.00-5.70% of Al, 1.20-1.70% of Ti, 2.00-2.50% of Ta, 6.00-8.00% of W, 0.01-0.2% of B and the balance Ni. The compositionof Cr, Mo, W in the alloy is controlled as following: the specific value between the sum of the mass fraction of the W element and the Mo element to the mass fraction of the Cr element is less than 1.0. The invention further discloses a preparation method of the low-cobalt high-temperature alloy supercharging turbine, and belongs to the technical field of automotives. By means of the alloy component, the strategic scarce resources Co are saved greatly, and meanwhile, the obtained supercharging turbine is not prone to hot-cracking.

Description

technical field [0001] The invention relates to an alloy composition of a low-cobalt superalloy turbocharger and a preparation method thereof, belonging to the technical field of automobiles. Background technique [0002] The application of turbocharger technology in the automotive industry improves engine efficiency, reduces fuel consumption, reduces exhaust emissions, and brings significant economic and social benefits. [0003] Ordinary precision casting nickel-based superalloys are widely used in the manufacture of automotive turbochargers due to their high thermal strength, high temperature corrosion resistance, mechanical / thermal fatigue resistance and relatively low cost. This type of alloy forms a stable γ' phase at high temperature by adding Al and Ti elements as a strengthening phase, and at the same time adds Co, Mo, W, Nb and other alloying elements for solid solution strengthening to obtain high-temperature mechanical properties, and adds Cr elements to form Th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C19/05C22C1/02B22C9/04B22C9/22B22C3/00
CPCB22C3/00B22C9/043B22C9/22C22C1/023C22C19/056
Inventor 刘惠明王珏王章忠
Owner JIANGYIN UNI POL
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