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Iron-chromium-aluminum alloy machining process

A technology of iron-chromium-aluminum alloy and processing technology, which is applied in the field of metal processing, can solve the problems of large stress required for grinding alumina particles, severe wear of abrasive tools, and reduced machining performance, so as to improve machining performance and production efficiency, Improve the purity of the alloy and promote the effect of grain refinement

Inactive Publication Date: 2015-04-29
DANYANG ZHISHENG ALLOY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Fe-chromium-aluminum alloy has good thermal stability, ideal thermal conductivity, strong oxidation resistance, good vibration resistance, and good machinability, etc. Advantages make it widely used in all walks of life, so there are more and more researches on the processing technology of iron-chromium-aluminum alloys. For example, application number 97104028.1 discloses a kind of iron-chromium-aluminum alloy and its manufacturing method. The manufacturing method first adopts powder The iron-chromium-aluminum alloy billets are prepared by metallurgical methods, and then processed into products. The preparation of iron-chromium-aluminum alloy billets by powder metallurgy includes powder making, mechanical alloying, molding and sintering processes. The iron-chromium-aluminum alloy products prepared by the invention have higher High temperature strength and higher oxidation resistance and processing performance, so the service temperature is high and the service life is long, but the powder making and mechanical alloying processing in this invention are more difficult, and the stress required for grinding alumina particles is large, which is very difficult for grinding. The tool loss is severe, and the sintering is carried out under the protection of hydrogen, which makes the distribution of the alumina layer on the surface of the billet uneven, and may cause hydrogen embrittlement fracture of the billet, and reduce the machinability

Method used

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  • Iron-chromium-aluminum alloy machining process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1. Smelting: Put the smelting materials into a vacuum induction furnace for smelting. The smelting materials are iron ingots, chromium ingots, aluminum ingots and alumina particles, of which the Cr content is 25%, the Al content is 4.5%, and the Al content is 4.5%. 2 o 3 The content is 0.1%, and the others are Fe. The proportion of the smelting material is analyzed and confirmed with a hand-held alloy composition rapid detector, preheated at 350°C for 2 hours, and the temperature of the alloy liquid is controlled at 740°C during melting, and electromagnetic stirring is performed every 15 minutes;

[0021] 2. Refining: Add the refining agent hexachloroethane to the alloy liquid in step (1), the addition amount is 0.4% of the total weight of the alloy, and the time interval of electromagnetic stirring is 10 minutes;

[0022] 3. Filtration: The alloy liquid refined in step (2) is introduced into the filter box through the foam ceramic filter plate, and the temperature of t...

Embodiment 2

[0030] Example 2: The rest are the same as in Example 1, except that in the step (1), the Cr content is 22%, the Al content is 5.7%, and the Al content is 5.7%. 2 o 3 The content is 1.0%, and the others are Fe. In the step (1), preheat at 400°C and keep it warm for 3 hours. When melting, the temperature of the alloy liquid is controlled at 750°C. The amount of refining agent added in the step (2) is the total weight of the alloy 1%, the temperature of the filter box in the step (3) is set to 725°C, the alloy liquid introduced into the crystallizer in the step (4) is 60L / mim, and the discharge pulse frequency in the step (5) is adjusted to 155KHz, the discharge gap is adjusted to 57% voltage, the speed of the roll machine in the step (6) is controlled at 80r / min, and the temperature of the middle-temperature furnace in the step (7) is heated to 500°C and then kept for 3h.

Embodiment 3

[0031] Example 3: The rest are the same as in Example 1, except that in the step (1), the Cr content is 15%, the Al content is 5.1%, and the Al 2 o 3 The content is 2.0%, and the others are Fe. In the step (1), preheat at 450°C and keep it warm for 4h. When melting, the temperature of the alloy liquid is controlled at 760°C. The amount of refining agent added in the step (2) is the total weight of the alloy 2%, the temperature of the filter box in the step (3) is set to 750°C, the alloy liquid introduced into the crystallizer in the step (4) is 70L / min, and the discharge pulse frequency in the step (5) is adjusted to 160KHz, the discharge gap is adjusted to 60% voltage, the speed of the roll machine in the step (6) is controlled at 90r / min, and the temperature of the middle-temperature furnace in the step (7) is heated to 550°C and then kept for 4h.

[0032] After the above process steps, the lens samples are taken out to be tested:

[0033]

[0034] From the above data...

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Abstract

The invention discloses an iron-chromium-aluminum alloy machining process and relates to the field of metal processing. The iron-chromium-aluminum alloy machining process comprises high-frequency smelting processing and cast rolling processing, and specifically comprises ten process steps of smelting, refining, filtering, casting, repairing, cold rolling, thermal treatment, finishing, checking and screening. In the processing method, vacuum melting is adopted to effectively protect the alloy from being oxidized and guarantee stable mechanical properties of the alloy; a refining agent and a foamed ceramic filter plate are capable of removing harmful gases and nonmetallic inclusions in the liquid alloy and improving the clarity of the alloy; water-cooling semi-continuous casting is adopted to reduce the time of cast cooling and effectively promote grain refinement; and as a result, the machining performance and the production efficiency are improved.

Description

technical field [0001] The invention relates to the field of metal processing, in particular to an iron-chromium-aluminum alloy processing technology. Background technique [0002] Iron-chromium-aluminum alloy has been widely used in various industries due to its good thermal stability, ideal thermal conductivity, strong oxidation resistance, good vibration resistance, and good machinability. There are also more and more studies on the processing technology of chrome-aluminum alloys. For example, application number 97104028.1 discloses a kind of iron-chromium-aluminum alloy and its manufacturing method. The manufacturing method first adopts powder metallurgy to prepare iron-chromium-aluminum alloy blanks, and then processes them into products. The preparation of iron-chromium-aluminum alloy blanks by powder metallurgy includes powder making, mechanical alloying, molding and sintering processes. The iron-chromium-aluminum alloy products prepared by the invention have higher h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/18C21D8/02
CPCC22C38/18C21D8/0236
Inventor 王良玉张坚刘浩方
Owner DANYANG ZHISHENG ALLOY
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