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High rigidity low thermal expansion casting and manufacturing method thereof

A low thermal expansion and manufacturing method technology, applied in the field of high rigidity low thermal expansion castings and its manufacturing, can solve the problems of low thermal expansion, which cannot be realized, and the thermal expansion coefficient becomes high, and achieve the effect of low Ms point and high rigidity

Active Publication Date: 2019-02-01
신호코쿠머티리얼가부시키가이샤
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as described in Patent Document 2, even if martensitic transformation occurs even slightly, the coefficient of thermal expansion increases remarkably, and an alloy that achieves low thermal expansion and high Young's modulus cannot be obtained.

Method used

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  • High rigidity low thermal expansion casting and manufacturing method thereof
  • High rigidity low thermal expansion casting and manufacturing method thereof
  • High rigidity low thermal expansion casting and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] The melt adjusted to the composition shown in Table 1 was poured into the mold to manufacture a plurality of castings. The casting is φ100×350, cut into the size of the sample 7mm×16mm×125mm, as a test piece. Any one of the following heat treatments was performed on the manufactured casting to obtain the final casting.

[0070] (a) Solution treatment

[0071] (b) RC treatment (low temperature treatment → recrystallization treatment)

[0072] (c) Solution treatment → RC treatment

[0073] (d) RC treatment including tempering treatment (low temperature treatment → tempering treatment → recrystallization treatment)

[0074] (e) Solution treatment → RC treatment including quenching and tempering treatment

[0075] Table 1

[0076]

[0077] For the manufactured castings, Young's modulus, thermal expansion coefficient, Ms point, and average grain size of the austenite structure were measured. The Young's modulus was measured at room temperature by the two-point suppo...

Embodiment 2

[0081] The melt adjusted to the composition shown in Table 3 was poured into the mold to manufacture a plurality of castings. The casting is φ100×350, cut into the size of the sample 7mm×16mm×125mm, as a test piece. The manufactured casting was subjected to solution treatment→low temperature treatment→recrystallization treatment to obtain the final casting. The solution treatment was set at 830°C×2 hours, the low temperature treatment was set at immersion in liquid nitrogen×2 hours, and the recrystallization treatment was set at 830°C×2 hours.

[0082] table 3

[0083]

[0084]Table 4 shows the observation results of Young's modulus, coefficient of thermal expansion, and structure of the manufactured castings. The assay method is the same as in Example 1. in addition, Figure 7 Indicates the structure of castings between low temperature treatment and recrystallization treatment. The area ratio of martensite in the table indicates the area ratio of martensite in the str...

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Abstract

The present invention provides a casting with high rigidity and low thermal expansion and a manufacture method thereof. The casting is composed of Ni of 27-35 mass%, the balance of Fe and unavoidable impurities. The average crystal grain size of an austenite structure is less than 200[Mu]m.

Description

technical field [0001] The present invention relates to high rigidity low thermal expansion castings with high Young's modulus and methods of making the same. Background technique [0002] Thermally stable Invar alloys are widely used as component materials for electronic and / or semiconductor-related equipment, laser processing machines, and ultra-precision processing equipment. However, conventional Invar alloys have a problem that their Young's modulus is small, about one-half of that of general steel materials. Therefore, it is necessary to design a high-rigidity design such as increasing the thickness of the target component. [0003] In order to solve this problem, Patent Document 1 discloses high Young's modulus and low thermal expansion Fe-Ni in which Young's modulus is increased by adding Nb or the like to make an ingot, and then hot forging and / or rolling. alloy. [0004] Patent Document 2 discloses a member of an ultra-precision device using an alloy steel in wh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/08C21D6/00
Inventor 坂口直辉大野晴康小奈浩太郎
Owner 신호코쿠머티리얼가부시키가이샤
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