A combined processing method for high-strength and high-toughness h62 brass

A high-strength, high-toughness, combined processing technology, applied in the field of non-ferrous alloy processing, achieves good industrial application prospects, simple process operation and equipment requirements, and good toughness.

Active Publication Date: 2022-02-22
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the research on high-pass ECAP processing of H62 brass has not been reported, and it is worth further research

Method used

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  • A combined processing method for high-strength and high-toughness h62 brass
  • A combined processing method for high-strength and high-toughness h62 brass
  • A combined processing method for high-strength and high-toughness h62 brass

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The purchased commercial H62 brass alloy was processed into a columnar test piece of 19.5mm×19.5mm×40mm by wire cutting. Composition, in which the α phase is a solid solution with Cu as the matrix and Zn as the solute atoms, and the β phase is a solid solution with CuZn electronic compounds as the base, and the crystal grains grow into strips, such as figure 1 shown. Then heat it at 560°C for 10 hours, then air-cool or water-cool for homogenization treatment, the H62 brass alloy β phase content obtained by homogenization treatment decreases, the grain size increases, and the grain shape presents a transition from elongated to equiaxed. state, such as figure 2 shown.

[0032] The test piece is pretreated according to the routine to obtain a clean surface, and the solid lubricant is evenly coated on the surface of the test piece and the mold surface, and then placed in a mold preheated to 350 ° C for 7 to 10 minutes, and then pressure is applied for 8 consecutive passe...

Embodiment 2

[0036] The purchased commercial H62 brass alloy was processed into a columnar specimen of 19.5mm×19.5mm×40mm by wire cutting, and then it was kept at 560°C for 10h and then air-cooled or water-cooled for homogenization.

[0037] The test piece is pretreated according to the routine to obtain a clean surface, and the solid lubricant is evenly coated on the surface of the test piece and the mold surface, and then placed in a mold preheated to 350 ° C for 7 to 10 minutes, and then pressure is applied for 8 consecutive passes of ECAP Extrusion, the sample is rotated 180° between adjacent extrusion passes to improve the uniformity of the extrusion structure, and after annealing at 300°C for 45 minutes, the content of β phase increases and the uniformity of grains improves.

[0038] The tensile strength of the purchased commercial H62 brass alloy is less than 400MPa, but at a temperature of 350°C, after 8 passes of ECAP extrusion, the tensile strength reaches 530MPa, and the overall el...

Embodiment 3

[0040] The purchased commercial H62 brass alloy was processed into a columnar specimen of 19.5mm×19.5mm×40mm by wire cutting, and then it was kept at 560°C for 10h and then air-cooled or water-cooled for homogenization.

[0041] The test piece is pretreated according to the routine to obtain a clean surface, and the solid lubricant is evenly coated on the surface of the test piece and the mold surface, and then placed in a mold preheated to 350 ° C for 7 to 10 minutes, and then pressure is applied for 8 consecutive passes of ECAP For extrusion, the sample is rotated 180° between adjacent extrusion passes to improve the uniformity of the extruded tissue. After annealing at 300°C for 60 minutes, the content of β phase increases and the uniformity of grains increases, as shown in Figure 5 shown.

[0042] The tensile strength of the purchased commercial H62 brass alloy is less than 400MPa, but at a temperature of 350°C, after 8 passes of ECAP extrusion, the tensile strength reac...

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Abstract

The invention discloses a combined processing method for high-strength and high-toughness H62 brass, belonging to the technical field of non-ferrous alloy processing. This processing method is mainly to apply the equal channel angular extrusion and subsequent heat treatment process to the commercial H62 alloy with low strength, which can improve its strength and toughness by controlling the microstructure without changing the shape and size of the sample. The invention has the characteristics of high yield, simple process operation and equipment requirements, and has good industrial application prospect.

Description

technical field [0001] The invention belongs to the technical field of non-ferrous alloy processing, and in particular relates to a combined processing method of high-strength and high-toughness H62 brass alloy. Background technique [0002] Brass is a copper alloy composed of copper and zinc. Brass composed only of copper and zinc is called ordinary brass. The copper content of H62 brass is 60.5% to 63.5%. Due to its high strength and high hardness , good plasticity, good machinability, good corrosion resistance, easy welding, is widely used in automobile, shipbuilding and precision machinery manufacturing, etc., and can also be used to manufacture stressed parts produced by various deep drawing and bending processes , such as pins, rivets, washers, nuts, conduits, screens, barometer springs, radiator parts, etc. However, with the improvement of scientific and technological level and the development of industrial technology, there are higher requirements for the comprehens...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/08
CPCC22F1/08C22F1/002
Inventor 陈建清苏业涵孙甲鹏马爱斌江静华杨东辉宋丹
Owner HOHAI UNIV
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