Low-expansion alloy and preparation method thereof

A technology of low-expansion alloy and alloy ingot casting, which is applied in the field of low-expansion alloy and can solve problems such as strengthening low-expansion alloy

Active Publication Date: 2020-10-23
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is currently no related research on strengthening low-e

Method used

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  • Low-expansion alloy and preparation method thereof
  • Low-expansion alloy and preparation method thereof

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Embodiment 1

[0055] The present embodiment prepares a low-expansion alloy, which specifically includes the following steps:

[0056] Preparation of low-expansion alloy body (ie, hot-rolled sheet): put the raw material into a high-frequency vacuum induction melting furnace, heat the temperature to 1450 ° C, and the vacuum degree of the melting furnace is 0.2 × 10 -2 Pa, after all the raw materials are melted, refine at a temperature of 1800° C. for 5 minutes, then introduce inert gas, and cast the crucible into an ingot (alloy ingot). The formulation of the raw materials is as follows: Mo 0.15%, Si 0.18%, Mn 0.32%, Ni 36%, Co 0.25%, and the balance is Fe. After the alloy ingot is cooled, the alloy ingot is heated to 1150° C. and kept at this temperature for 4 hours for homogenization treatment. Subsequently, billeting is carried out on a hot rolling mill, wherein the rolling temperature is 1150° C., the total reduction rate is 95%, and the final rolling temperature is 950° C., and when rol...

Embodiment 2

[0062] The present embodiment prepares a low-expansion alloy, which specifically includes the following steps:

[0063] Preparation of low-expansion alloy body (ie, hot-rolled sheet): put the raw material into a high-frequency vacuum induction melting furnace, heat the temperature to 1500 ° C, and the vacuum degree of the melting furnace is 0.4×10 -2 Pa, after all the raw materials are melted, refine at a temperature of 1600° C. for 6 minutes, then pass in an inert gas, and cast the crucible into an ingot (ie, an alloy ingot). The formula of the raw materials is as follows: Mo 0.15%, Si 0.18%, Mn 0.32%, Ni 36%, Co 0.25%, and the balance is Fe. After the alloy ingot is cooled, the alloy ingot is heated to 1180° C. and kept at this temperature for 3 hours for homogenization treatment. Subsequently, billeting is carried out on a hot rolling mill, wherein the rolling temperature is 1180° C., the total reduction rate is 80%, and the final rolling temperature is 980° C., and when r...

Embodiment 3

[0069] The present embodiment prepares a low-expansion alloy, which specifically includes the following steps:

[0070] Preparation of low-expansion alloy body (ie, hot-rolled sheet): put the raw material into a high-frequency vacuum induction melting furnace, heat the temperature to 1550 ° C, and the vacuum degree of the melting furnace is 0.6×10 -2 Pa, after all the raw materials are melted, refine at a temperature of 1550° C. for 8 minutes, then pass in an inert gas, and cast the crucible into an ingot (ie, an alloy ingot). The formula of the raw materials is as follows: Mo 0.15%, Si 0.18%, Mn 0.32%, Ni 36%, Co 0.25%, and the balance is Fe. After the alloy ingot is cooled, the alloy ingot is heated to 1200° C. and kept at this temperature for 2 hours for homogenization treatment. Subsequently, billeting is carried out on a hot rolling mill, wherein the rolling temperature is 1200 °C, the total reduction rate is 60%, and the final rolling temperature is 900 °C, and when rol...

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Abstract

The invention relates to a low-expansion alloy and a preparation method thereof, and relates to the technical field of low-expansion alloys. According to the mainly adopted technical scheme, the volume fraction of annealing twin crystals in the low-expansion alloy is larger than or equal to 20%, and the linear expansion coefficient of the low-expansion alloy within the temperature range of -160 DEG C to 25 DEG C is 0.8*10<-6>/DEG C to 1.5*10<-6>/DEG C. The preparation method of the low-expansion alloy comprises the step of sequentially carrying out solution treatment, cold rolling deformationtreatment and annealing treatment on a low-expansion alloy body so as to obtain the low-expansion alloy, wherein in the cold rolling deformation treatment step, the total deformation of the alloy is 65-99%, and in the annealing step, the annealing temperature ranges from 800 DEG C to 900 DEG C, and the annealing time ranges from 5 min to 30 min. According to the low-expansion alloy, annealing twincrystals can be effectively introduced into the low-expansion alloy, so that the low-expansion alloy is strengthened on the premise that the linear expansion coefficient of the alloy is hardly influenced. The contradictory relation between the expansion performance and the strength of the alloy is fundamentally solved, and application of the low-expansion alloy in precise structural parts is facilitated.

Description

technical field [0001] The invention relates to the technical field of low-expansion alloys, in particular to a low-expansion alloy and a preparation method thereof. Background technique [0002] Low expansion alloy is an alloy with excellent low expansion properties, and its average linear expansion coefficient in the temperature range of -196 ° C to 100 ° C is only 1.5 × 10 -6 / °C. Low expansion alloys generally have a face-centered cubic structure and can maintain a single austenite structure at low temperatures. Low expansion alloys are widely used in many fields such as natural gas storage tanks, shadow mask materials, aerospace, shipbuilding, and precision instruments due to their good low expansion properties and structural stability. [0003] With the development of technology, the proportion of low-expansion alloys in structural materials is getting higher and higher; however, its low tensile strength (about 400MPa at room temperature) cannot meet the design requi...

Claims

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Application Information

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IPC IPC(8): C22C38/08C22C38/02C22C38/04C22C38/10C22C38/12C21D1/00C21D1/26C21D6/00C21D8/02C21D9/00
CPCC21D1/00C21D1/26C21D6/001C21D6/005C21D6/007C21D6/008C21D8/0221C21D9/0081C22C38/02C22C38/04C22C38/105C22C38/12
Inventor 张瑞朱传志崔传勇周亦胄孙晓峰
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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