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Preparation method of iron, chromium and aluminum multielement electrothermal alloy with high resistance

An electrothermal alloy, iron-chromium-aluminum series technology, applied in the field of preparation combined with melting and powder metallurgy, can solve the problems of urgent improvement of strength and oxidation resistance, serious brittleness, shortened service life, etc., to achieve the improvement of mechanical properties and Oxidation resistance, improvement of microstructure, and effect of improving alloy strength

Active Publication Date: 2014-07-23
YANCHENG XINYANG ELECTROTHERMAL MATERIAL CO LTD
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Problems solved by technology

It not only limits the scope of use, but also seriously shortens the service life
The existing iron-chromium-aluminum alloys have high carbon content and single alloying elements. After being used at high temperature, M 23 C 6 The precipitation is inevitable, especially when the alloy is used at high temperature for a long time, the grains grow very thick, the number of grain boundaries is relatively reduced, and the entire grain boundary is covered with network M 23 C 6 , the degree of brittleness is more severe
In addition, the strength and oxidation resistance of existing alloys need to be improved urgently

Method used

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Embodiment Construction

[0008] Further illustrate and understand the present invention through embodiment below.

[0009] The preparation method includes: (1) Batching: batching according to the following composition: C: 0.0015%, Si: 0.3%, Mn: 1.4%, Al: 0.95%, Cr: 14.6%, Co: 2.1%, Hf: 4.9 %, Zr: 5.6%, Nb: 6.3%, Ti: 1.8%, Tb: 0.4%, Dy: 0.5%, B: 0.007%, S≤O.0001%, P≤O.0001%, the balance is iron and unavoidable impurities; (2) Melting: put the above raw materials into a non-consumable electromagnetic induction melting furnace, and vacuumize to 1×10 -3 pa, filled with high-purity argon to 1×10 4 pa, smelted above 2800°C and then cooled with the furnace to form an alloy ingot; (3) crushing and ball milling: crush the smelted alloy ingot and put it into a high-energy ball mill to grind for 70 hours to obtain an alloy with an average particle size of 1-3 μm Alloy powder; (4) Discharge plasma sintering: put the mold filled with the above alloy powder into the sintering equipment, and sinter under vacuum co...

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Abstract

The invention relates to a preparation method of an iron, chromium and aluminum multielement electrothermal alloy with high resistance and particularly relates to a preparation method of fusion and powder metallurgy combined for the iron, chromium and aluminum multielement electrothermal alloy with high resistance. The preparation method comprises the following steps: burdening; smelting; smashing; ball-milling; sintering by a discharge plasma; homogenizing annealing; isothermal forging; hot-rolling of a wire rod; stress relief annealing; and multi-pass drawing after rinsing and the like. The preparation method combining fusion and powder metallurgy can effectively avoid composition segregation in conventional smelting methods due to great difference on melting point, density and mass ratio of the components, so that the components are uniformly distributed. The microstructure of the alloy is effectively improved by combining subsequent processes such as homogenizing annealing, isothermal forging and wire rod hot-rolling, so that the toughness, the tensile strength and the inoxidizability of the alloy are improved.

Description

Technical field: [0001] The invention relates to a preparation method of an iron-chromium-aluminum multi-component high-resistance electric heating alloy, in particular to a preparation method combining melting and powder metallurgy of an iron-chromium-aluminum multi-component high-resistance electric heating alloy. Background technique: [0002] Electrothermal alloy materials are resistance alloys that use the resistance properties of substances to manufacture heating elements. At present, the electrothermal alloy material has become an important engineering alloy material, which is suitable for machinery, metallurgy, electronics, chemical industry and other industries, and occupies an important position in the national economy. The electrothermal alloys currently used are mainly divided into two categories: iron-chromium-aluminum alloys with ferrite structure and nickel-chromium alloys with austenite structure. Iron-chromium-aluminum alloys have a series of advantages over...

Claims

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Application Information

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IPC IPC(8): C22C38/38C22C38/32C22C33/00C21D8/06
Inventor 郭健郭小芳郭乃林
Owner YANCHENG XINYANG ELECTROTHERMAL MATERIAL CO LTD
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