A kind of low expansion alloy and preparation method thereof

A low-expansion alloy and alloy ingot technology, applied in the field of low-expansion alloys, can solve the problems of strengthening low-expansion alloys, achieve the effect of optimizing alloy strength and eliminating residual internal stress

Active Publication Date: 2021-10-29
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-expansion alloys by introducing annealing twins in low-expansion alloys.

Method used

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  • A kind of low expansion alloy and preparation method thereof
  • A kind of low expansion alloy and preparation method thereof
  • A kind of low expansion alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] The present embodiment prepares a kind of low-expansion alloy, specifically comprises the following steps:

[0056] Preparation of low-expansion alloy body (ie, hot-rolled plate): 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 pass in an inert gas, and cast a crucible into an ingot (alloy ingot). Wherein, the formula of 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. Carry out blanking on the hot rolling mill subsequently, wherein, the starting rolling temperature is 1150 ℃, the total reduction rate is 95%, the final rolling temperature is 950 ℃, and when rolling to 3mm thic...

Embodiment 2

[0062] The present embodiment prepares a kind of low-expansion alloy, specifically comprises the following steps:

[0063] Preparation of low-expansion alloy body (ie, hot-rolled plate): 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, it is refined at a temperature of 1600°C for 6 minutes, and then an inert gas is introduced, and a crucible is cast into an ingot (ie, an alloy ingot). Wherein, the formula of 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. Carry out blanking on the hot rolling mill subsequently, wherein, the starting rolling temperature is 1180 ℃, the total reduction rate is 80%, the final rolling temperature is 980 ℃, a...

Embodiment 3

[0069] The present embodiment prepares a kind of low-expansion alloy, specifically comprises the following steps:

[0070] Preparation of low-expansion alloy body (ie, hot-rolled plate): 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, it is refined at a temperature of 1550°C for 8 minutes, and then an inert gas is introduced, and a crucible is cast into an ingot (ie, an alloy ingot). Wherein, the formula of 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. Carry out blanking on the hot rolling mill subsequently, wherein, the starting rolling temperature is 1200 ℃, the total reduction rate is 60%, the final rolling temperature is 900 ℃, w...

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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. The main technical solution is: the volume fraction of the annealing twins in the low-expansion alloy is ≥ 20%, and the linear expansion coefficient of the low-expansion alloy in the temperature range of -160-25°C is 0.8×10 ‑6 / ℃~1.5×10 ‑6 / °C. The preparation method of the low-expansion alloy comprises the following steps: performing solution treatment, cold-rolling deformation treatment, and annealing treatment on the low-expansion alloy body in sequence to obtain the low-expansion alloy; in the step of cold-rolling deformation treatment, the total deformation of the alloy is 65 ~99%; in the annealing step, the annealing temperature is 800-900° C., and the annealing time is 5-30 minutes. The invention can effectively introduce annealing twins into the low-expansion alloy, so as to realize the strengthening of the low-expansion alloy under the premise of hardly affecting the linear expansion coefficient of the alloy. The invention fundamentally solves the contradictory relationship between the expansion performance and strength of the alloy, and contributes to the application of the low-expansion alloy in precision structural parts.

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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Patent Type & Authority Patents(China)
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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