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A heat treatment process for qal9-4-4 aluminum bronze alloy

An aluminum bronze, high temperature heat treatment technology, applied in the field of heat treatment process of QAL9-4-4 aluminum bronze alloy, can solve the problem of alloy strength and toughness matching, and achieve the effect of stabilizing alloy structure, reducing residual stress, and inhibiting aggregation and growth.

Active Publication Date: 2020-04-10
贵溪骏达特种铜材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a QAL9-4-4 aluminum bronze alloy heat treatment process to solve the problem of matching the strength and toughness of the alloy, and at the same time eliminate the internal stress and stabilize the structure of the specific parts processed by the alloy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] QAL9-4-4 aluminum bronze alloy, the mass percentage of each element is: Al: 8.6%, Ni: 4.2%, Fe: 4.0%, unavoidable impurities: <0.5%, balance: Cu. Cast and extruded into rods according to the conventional process, the extruded rod specification is φ55mm. The heat treatment process is as follows:

[0015] (1) Put the extruded QAL9-4-4 aluminum bronze alloy rod into a resistance furnace heated to 880°C for 3 hours for high-temperature heat treatment, and immediately cool it in warm water at 50°C after coming out of the furnace.

[0016] (2) Put the QAL9-4-4 aluminum bronze alloy rods that have undergone high-temperature heat treatment into a resistance furnace heated to 470 ° C for 3 hours for low-temperature heat treatment, and air-cool after being released from the furnace

[0017] The test shows that the QAL9-4-4 aluminum bronze alloy structure after the heat treatment process of Example 1 of the present invention is mainly distributed with K on the α matrix. I and K ...

Embodiment 2

[0022] QAL9-4-4 aluminum bronze alloy, the mass percentage of each element is: Al: 8.6%, Ni: 4.2%, Fe: 4.0%, unavoidable impurities: <0.5%, balance: Cu. Cast and extruded into rods according to the conventional process, the extruded rod specification is φ55mm. The heat treatment process is as follows:

[0023] (1) Put the extruded QAL9-4-4 aluminum bronze alloy rod into a resistance furnace heated to 830°C for 2 hours for high-temperature heat treatment, and immediately cool it in warm water at 60°C after coming out of the furnace.

[0024] (2) Put the QAL9-4-4 aluminum bronze alloy bar material that has undergone high-temperature heat treatment into a resistance furnace heated to 440°C for 2 hours for low-temperature heat treatment, and air-cool after being released from the furnace.

[0025] The test shows that the structure of the QAL9-4-4 aluminum bronze alloy treated by the heat treatment process of Example 2 of the present invention is β, and the matrix is ​​distributed...

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Abstract

The invention belongs to the technical field of thermal processing of copper alloys, and in particular relates to a QAl9-4-4 aluminum bronze alloy heat treatment process. The operation steps are as follows: (1) cutting an extruded QAl9-4-4 aluminum bronze alloy pipe or bar into specified lengths, placing the QAl9-4-4 aluminum bronze alloy pipe or bar in a resistance furnace heated to a temperatureof (850 to 900) DEG C for thermal insulation for 1 to 5 hours for high temperature heat treatment, and immediately cooling the QAl9-4-4 aluminum bronze alloy pipe or bar in 50-80 DEG C warm water after discharged from the resistance furnace; (2) placing the high-temperature thermally-treated QAl9-4-4 aluminum bronze alloy pipe or bar in the resistance furnace heated to a temperature of (420-470)DEG C for thermal insulation for 3 to 8 hours for low-temperature heat treatment, and cooling by air the QAl9-4-4 aluminum bronze alloy pipe or bar after discharged from the resistance furnace; and (3) processing the low-temperature thermally-treated QAl9-4-4 aluminum bronze alloy pipe or bar into parts, placing the parts in the resistance furnace heated to a temperature of (480-550) DEG C for thermal insulation for 2 to 6 hours for heat treatment, and cooling by air the parts after discharged from the resistance furnace. The QAl9-4-4 aluminum bronze alloy pipe or bar prepared by the QAl9-4-4aluminum bronze alloy heat treatment process has a tensile strength reaching 820 MPa or more, a hardness reaching 220 HBS or more, and an elongation of 10% or more. The comprehensive mechanical properties of the QAl9-4-4 aluminum bronze alloy pipe or bar are better than commonly used QAl10-4-4 alloys, and the QAl9-4-4 aluminum bronze alloy pipe or bar is stable in structure and performance, and can be more widely used in the manufacture of various wear-resistant and corrosion-resistant parts such as bearings and bushings.

Description

technical field [0001] The invention belongs to the technical field of copper alloy heat processing, and in particular relates to a heat treatment process of a QAL9-4-4 aluminum bronze alloy. [0002] technical background [0003] QAL9-4-4 alloy is a multi-component complex copper alloy material with excellent comprehensive properties, with aluminum, nickel, and iron as the main alloying elements. Its formability is equivalent to that of QAL9-4 aluminum bronze without iron, and it can be extruded Tubes and rods of various specifications, and its extruded strength is comparable to QAl10-4-4, widely used in bearings, bushings, gears, discs, guide rocker bushings, nozzles, etc. Manufacture of parts. Compared with QAl10-4-4, its aluminum content is relatively low (the aluminum content is less than its maximum solid solubility in copper, and the structure is less prone to α+ which has a great influence on the formability and mechanical properties of the alloy. gamma 2 eutectoid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/08C22C9/01
CPCC22C9/01C22F1/002C22F1/08
Inventor 胡遐秋胡克福林高用
Owner 贵溪骏达特种铜材有限公司
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