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A preparation method for obtaining complex precision fine-grained castings

A precise and fine-grained technology, which is applied in the field of obtaining complex precision and fine-grained castings, can solve the problems of coarse structure and incomplete filling of castings, and achieve the effects of less structure defects, improved production efficiency and high density.

Inactive Publication Date: 2018-02-27
XIAN UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Purpose of the invention: In order to overcome the problems existing in the prior art such as incomplete filling in the pouring process or coarse structure of the casting, the present invention proposes a method that can be applied in industry by combining isothermal treatment of the melt with sequential solidification. A method for preparing precision castings with better integrity and finer structure

Method used

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  • A preparation method for obtaining complex precision fine-grained castings
  • A preparation method for obtaining complex precision fine-grained castings
  • A preparation method for obtaining complex precision fine-grained castings

Examples

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specific Embodiment 1

[0053] Realize the device of preparation method of the present invention such as Figure 1a and 1b As shown, it includes a platinum-rhodium thermocouple 1 , a fixing fixture 3 , a sprue cup 4 , a support platform 5 , an induction coil 6 , a mold shell 7 , a water-cooled copper plate 9 and a rotating screw 10 .

[0054] Figure 2a and Figure 2b In order to use this process to pour out the physical map of precision fine-grained castings, the grain size of the target sample in the precision castings should reach ASTM2-3 (such as Figure 3a , Figure 3b shown).

[0055] Such as Figure 5 As shown, a preparation method for obtaining complex precision fine-grained castings comprises the following steps:

[0056] (1), melt superheating treatment

[0057] (11) First put the nickel-based superalloy Ni-22Cr-18W-1Mo (indicating that the mass ratio of Ni:Cr:W:Mo in the alloy is 1:22:18:1) into the quartz crucible, and put the quartz crucible into the vacuum arc melting furnace, an...

specific Embodiment 2

[0071] A preparation method for obtaining complex precision fine-grained castings, comprising the following steps:

[0072] (1), melt superheating treatment

[0073] (11) First put the nickel-based superalloy Ni-22Cr-18W-1Mo into the quartz crucible, and put the quartz crucible into the vacuum arc melting furnace, then vacuumize it, and in a vacuum of 10 -2 Pass inert gas at Pa,

[0074] (12) When the furnace pressure exceeds 0.5Pa, heat the nickel-based superalloy Ni-22Cr-18W-1Mo to 1500°C through a medium-frequency electromagnetic field, and obtain a melt after holding for 10 minutes;

[0075] (2) slow cooling

[0076] The melt obtained in step (1) is cooled to 1410° C., and the cooling rate is 2° C. / min, wherein:

[0077] During the cooling process, the temperature of the melt obtained in step (1) is measured by multiple platinum-rhodium thermocouples, and the maximum temperature difference measured by each platinum-rhodium thermocouple is no more than 3°C.

[0078] (3)...

specific Embodiment 3

[0087] A preparation method for obtaining complex precision fine-grained castings, comprising the following steps:

[0088] (1), melt superheating treatment

[0089] (11) First put the nickel-based superalloy Ni-22Cr-18W-1Mo into the quartz crucible, and put the quartz crucible into the vacuum arc melting furnace, then vacuumize, and in the vacuum degree of 5 × 10 -3 Pass inert gas at Pa,

[0090] (12) When the furnace pressure exceeds 0.5Pa, heat the nickel-based superalloy Ni-22Cr-18W-1Mo to 1475°C through an intermediate frequency electromagnetic field, and obtain a melt after holding for 15 minutes;

[0091] (2) slow cooling

[0092] The melt obtained in step (1) is cooled to 1410° C., and the cooling rate is 1.6° C. / min, wherein:

[0093] During the cooling process, the temperature of the melt obtained in step (1) is measured by multiple platinum-rhodium thermocouples, and the maximum temperature difference measured by each platinum-rhodium thermocouple is no more than...

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Abstract

The invention relates to a preparing method for obtaining a complex precise fine grain casting. The preparing method comprises the steps that firstly, melt overheating treatment is conducted; secondly, melt obtained in the first step is cooled to 1,410 DEG C, and the cooling rate ranges from 1.2 DEG C / min to 2 DEG C / min; thirdly, the melt obtained after cooling in the second step is subjected to heat preservation for T hours; thirdly, the melt obtained in the third step is poured into a die shell with the preheating temperature of 1,400 DEG C along a pouring cup under the heating condition that an electromagnetic field serves as a power source; and fifthly, a water cooling copper disc at the lower portion of the die shell is started, the die shell rotates along with the lower water cooling copper disc, the water cooling copper disc integrally moves downwards under connection of a rotation screw, the rotation angular speed ranges from 150 degrees / s to 360 degrees / s, the melt in the die shell downwards moves along with the die shell, after part of the die shell moves out of a heating power source, the temperature of the melt in the die shell is reduced, the metal is crystallized, finally, the melt in the die shell moves and is condensed at the same time along with the water cooling tray, and the complex precise fine grain casting is obtained.

Description

technical field [0001] The invention relates to a preparation method for obtaining complex precision fine-grained castings, belonging to the field of metal material preparation. Background technique [0002] The grain size has a great influence on the mechanical properties of metal materials. When the grain size is fine, metals and alloys not only have high strength and high toughness, but also have good comprehensive mechanical properties. Therefore, in the preparation and production process of metal materials, obtaining fine grains (fine grains) is of great significance for improving the mechanical properties of materials. This is especially true for superalloys that are widely used in the aerospace field. Superalloys are irreplaceable materials for manufacturing high-temperature hot-end parts such as aviation, aerospace engines and gas turbines. They are also widely used in petrochemical, nuclear, and automotive industries. superior. Since the 1940s, the temperature at ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C19/05C22C1/03B22D27/02B22D27/04
CPCB22D27/02B22D27/045C22C1/023C22C1/03C22C19/055
Inventor 高中堂胡锐郭卫张传伟
Owner XIAN UNIV OF SCI & TECH
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