CN111380732A - Macroscopic hardness test method for copper-zinc alloy thin-walled tube - Google Patents
Macroscopic hardness test method for copper-zinc alloy thin-walled tube Download PDFInfo
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- CN111380732A CN111380732A CN202010321898.8A CN202010321898A CN111380732A CN 111380732 A CN111380732 A CN 111380732A CN 202010321898 A CN202010321898 A CN 202010321898A CN 111380732 A CN111380732 A CN 111380732A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/36—Embedding or analogous mounting of samples
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/40—Investigating hardness or rebound hardness
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
- G01N2001/2873—Cutting or cleaving
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0076—Hardness, compressibility or resistance to crushing
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- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating And Analyzing Materials By Characteristic Methods (AREA)
- Sampling And Sample Adjustment (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention provides a macroscopic hardness test method for a copper-zinc alloy thin-walled tube, which comprises the following steps of: 1) preparing a sample; 2) carrying out hot inlaying on the sample obtained in the step 1) by an inlaying machine to obtain a hot inlaid sample, wherein the inlaying temperature is not more than 200 ℃; 3) and (3) carrying out a hardness test on the hot mosaic sample obtained in the step 2) after air cooling. The method for testing the macroscopic hardness of the copper-zinc alloy thin-walled tube has the advantages of simple operation steps and convenience in operation, the macroscopic hardness of the copper-zinc alloy thin-walled tube tested by the method is consistent with the actual hardness, and the test result is accurate.
Description
Technical Field
The invention relates to the technical field of pipe manufacturing, in particular to a macroscopic hardness test method for a copper-zinc alloy thin-walled pipe.
Background
Hardness is the ability of a material to locally resist a hard object from being pressed into its surface, and is one of the important mechanical property indexes of the material. The hardness test is the most common method in the mechanical property test, and is the fastest and most economical test method, but when the thin-wall pipe hardness test is carried out, the sample is deformed due to too thin material, so that the hardness value is distorted.
Generally, a micro vickers hardness test is adopted for a hardness test of a thin-wall material, but the micro vickers hardness reaction is the micro hardness of the material, the fluctuation is large, the hardness value of the material cannot be really reflected frequently, and the sample preparation requirement is high; meanwhile, the ASME SA1016 general requirements of ferrite alloy steel and austenite alloy steel pipes do not require a hardness test on pipes with the wall thickness of less than 1.7mm, and the fundamental reason is that the hardness value is distorted due to too thin wall thickness.
Disclosure of Invention
The invention aims to overcome and supplement the defects in the prior art, and provides a method for testing the macroscopic hardness of the copper-zinc alloy thin-walled tube, which has the advantages of simple steps, convenience in operation, capability of quickly detecting the macroscopic hardness of the copper-zinc alloy thin-walled tube, and consistency of the detection result with the actual hardness. The technical scheme adopted by the invention is as follows:
a macroscopic hardness test method for a copper-zinc alloy thin-walled tube comprises the following steps: the method comprises the following steps:
1) preparing a sample;
2) carrying out hot inlaying on the sample obtained in the step 1) by an inlaying machine to obtain a hot inlaid sample, wherein the inlaying temperature is not more than 200 ℃;
3) and (3) carrying out a hardness test on the hot mosaic sample obtained in the step 2) after air cooling.
Preferably, the method for testing the macroscopic hardness of the copper-zinc alloy thin-walled tube comprises the following steps: in the step 1), the length of the test sample is 5-15 mm, and the width of the test sample is 2-15 mm.
Preferably, the method for testing the macroscopic hardness of the copper-zinc alloy thin-walled tube comprises the following steps: the width of the boat-shaped sample is selected by combining the diameter of an indenter of a hardness testing machine, the outer diameter of the small-caliber pipe is smaller than 25mm, and the width of the hardness sample is 2-5 mm.
Preferably, the method for testing the macroscopic hardness of the copper-zinc alloy thin-walled tube comprises the following steps: in the step 2), the hardness of the hot-inlaid sample is higher than that of the boat-shaped sample; and 2) carrying out inlaying in different directions according to different test surfaces during hot inlaying in the step 2), wherein the inner surface is exposed and faces upwards when the test surface is an inner surface, the outer surface is exposed and faces upwards when the test surface is an outer surface, and the cross section is exposed and faces upwards when the test surface is a cross section.
Preferably, the method for testing the macroscopic hardness of the copper-zinc alloy thin-walled tube comprises the following steps: the embedding material in the hot embedding in the step 2) is selected from one of bakelite powder, phenolic resin and epoxy resin.
Preferably, the method for testing the macroscopic hardness of the copper-zinc alloy thin-walled tube comprises the following steps: the step 3) of polishing the hot-inlaid sample before the hardness test is carried out, and when the test surfaces are the inner surface and the outer surface, manual polishing and brightening are carried out by using sand paper with the grain size not less than 1000 meshes; when the test surface is a cross section, slightly polishing the cross section of the test surface on a sample polishing machine by using 400-600-mesh abrasive paper, exposing the test sample to a flat metal surface, and manually polishing the cross section of the test sample to be bright by using not less than 1000-mesh abrasive paper.
The invention has the advantages that: the method for testing the macroscopic hardness of the copper-zinc alloy thin-walled tube has the advantages of simple operation steps and convenience in operation, the macroscopic hardness of the copper-zinc alloy thin-walled tube tested by the method is consistent with the actual hardness, the test result is accurate, and the actual hardness of the material can be obtained by the method.
Detailed Description
The present invention will be further described with reference to the following specific examples.
Example 1
A macroscopic hardness test method for a copper-zinc alloy thin-wall tube selects a copper-zinc alloy tube with the mark of H62 and the specification of phi 16 × 1mm to carry out Rockwell hardness HRB test, and detects the hardness of the inner surface of the copper-zinc alloy tube, and comprises the following steps:
1) cutting a boat-shaped sample by using linear cutting, wherein the length is 10mm, and the width is 4 mm;
2) carrying out hot inlaying on the sample obtained in the step 1) by using an inlaying machine, wherein the inlaying temperature is 180 ℃, the inlaying material is bakelite powder, and the inner surface of the sample is exposed upwards;
3) and after air cooling, manually polishing and brightening the mosaic sample obtained in the step 2) by using 1000-mesh sand paper, and then performing a hardness test, wherein the result is 66 HRB.
A tensile sample is cut on a pipe close to the hardness sample, the tensile strength of the tensile sample is detected to be 406MPa, the hardness corresponding to the strength is 66.6HRB according to GB/T3771 converted value of copper alloy hardness and strength, and the tensile strength is attached to an actual hardness result 66HRB, so that the measurement result of the method reflects the real situation of the hardness of the material.
Example 2
A macroscopic hardness test method for a copper-zinc alloy thin-wall tube selects a copper-zinc alloy tube with the mark of H62 and the specification of phi 10 × 0.6mm to carry out Vickers hardness HV5 test, and detects the hardness of the outer surface of the copper-zinc alloy tube, and comprises the following steps:
1) cutting a boat-shaped sample by using linear cutting, wherein the length is 5mm, and the width is 2 mm;
2) carrying out hot inlaying on the sample obtained in the step 1) by using an inlaying machine, wherein the inlaying temperature is 200 ℃, the inlaying material is phenolic resin, and the outer surface of the sample is exposed upwards when the inner surface of the sample is exposed;
3) and air-cooling the mosaic sample obtained in the step 2), manually polishing the mosaic sample by using 1600-mesh sand paper to obtain bright, and then performing a hardness test, wherein the result is 125HV 5.
A tensile sample is cut on the pipe close to the hardness sample, the tensile strength of the tensile sample is detected to be 413MPa, the hardness corresponding to the strength is 123HV5 according to GB/T3771 'conversion value of copper alloy hardness and strength', and the tensile sample is attached to an actual hardness result of 125HV5, so that the measurement result of the method reflects the real situation of the hardness of the material.
Example 3
A macroscopic hardness test method for a copper-zinc alloy thin-wall tube selects a copper-zinc alloy tube with the mark of H62 and the specification of phi 20 × 1.5mm to carry out Vickers hardness HV5 test, and detects the cross section hardness of the copper-zinc alloy tube, and comprises the following steps:
1) the boat-shaped sample was cut by wire cutting, and the length was 5mm and the width was 2 mm.
2) And (2) carrying out hot inlaying on the sample obtained in the step 1) by using an inlaying machine, wherein the inlaying temperature is 150 ℃, the inlaying material is epoxy resin, and the cross section of the sample is exposed upwards.
3) And after air cooling the embedded sample obtained in the step 2), slightly polishing the embedded sample on a sample polishing machine by using 400-mesh abrasive paper, flattening the metal surface of the exposed part of the sample, manually polishing the cross section of the sample by using 1000-mesh abrasive paper for brightening, and then performing a hardness test, wherein the result is 119HV 5.
A tensile sample is cut on the pipe close to the hardness sample, the tensile strength of the tensile sample is detected to be 409MPa, the hardness corresponding to the strength is 120.9HV5 according to GB/T3771 'conversion value of copper alloy hardness and strength', and the tensile sample is attached to the actual hardness result of 119HV5, so that the measurement result of the method reflects the real situation of the hardness of the material.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (6)
1. A macroscopic hardness test method for a copper-zinc alloy thin-walled tube is characterized by comprising the following steps: the method comprises the following steps:
1) preparing a sample;
2) carrying out hot inlaying on the sample obtained in the step 1) by an inlaying machine to obtain a hot inlaid sample, wherein the inlaying temperature is not more than 200 ℃;
3) and (3) carrying out a hardness test on the hot mosaic sample obtained in the step 2) after air cooling.
2. The macroscopic hardness test method of the copper-zinc alloy thin-walled tube according to claim 1, wherein: in the step 1), the length of the test sample is 5-15 mm, and the width of the test sample is 2-15 mm.
3. The macroscopic hardness test method of the copper-zinc alloy thin-walled tube according to claim 2, wherein: the width of the boat-shaped sample is selected by combining the diameter of an indenter of a hardness testing machine, the outer diameter of the small-caliber pipe is smaller than 25mm, and the width of the hardness sample is 2-5 mm.
4. The macroscopic hardness test method of the copper-zinc alloy thin-walled tube according to claim 1, wherein: in the step 2), the hardness of the hot-inlaid sample is higher than that of the boat-shaped sample; and 2) carrying out inlaying in different directions according to different test surfaces during hot inlaying in the step 2), wherein the inner surface is exposed and faces upwards when the test surface is an inner surface, the outer surface is exposed and faces upwards when the test surface is an outer surface, and the cross section is exposed and faces upwards when the test surface is a cross section.
5. The macroscopic hardness test method of the copper-zinc alloy thin-walled tube according to claim 1, wherein: the embedding material in the hot embedding in the step 2) is selected from one of bakelite powder, phenolic resin and epoxy resin.
6. The macroscopic hardness test method of the copper-zinc alloy thin-walled tube according to claim 1, wherein: the step 3) of polishing the hot-inlaid sample before the hardness test is carried out, and when the test surfaces are the inner surface and the outer surface, manual polishing and brightening are carried out by using sand paper with the grain size not less than 1000 meshes; when the test surface is a cross section, slightly polishing the cross section of the test surface on a sample polishing machine by using 400-600-mesh abrasive paper, exposing the test sample to a flat metal surface, and manually polishing the cross section of the test sample to be bright by using not less than 1000-mesh abrasive paper.
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| CN202010321898.8A CN111380732A (en) | 2020-04-22 | 2020-04-22 | Macroscopic hardness test method for copper-zinc alloy thin-walled tube |
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| CN202010321898.8A CN111380732A (en) | 2020-04-22 | 2020-04-22 | Macroscopic hardness test method for copper-zinc alloy thin-walled tube |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112857950A (en) * | 2021-01-18 | 2021-05-28 | 燕山大学 | Metallographic corrosive agent for biphase medium manganese steel and metallographic structure display method |
Citations (2)
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|---|---|---|---|---|
| CN103398884A (en) * | 2013-07-30 | 2013-11-20 | 江苏法尔胜材料分析测试有限公司 | Hot embedding method for gold-phase sample preparation of thin steel wires |
| CN105300777A (en) * | 2015-11-13 | 2016-02-03 | 广西玉柴机器股份有限公司 | Metallographic specimen and hardness specimen embedding method |
-
2020
- 2020-04-22 CN CN202010321898.8A patent/CN111380732A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103398884A (en) * | 2013-07-30 | 2013-11-20 | 江苏法尔胜材料分析测试有限公司 | Hot embedding method for gold-phase sample preparation of thin steel wires |
| CN105300777A (en) * | 2015-11-13 | 2016-02-03 | 广西玉柴机器股份有限公司 | Metallographic specimen and hardness specimen embedding method |
Non-Patent Citations (2)
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| 任颂赞等主编: "《金相分析原理及技术》", 31 August 2013, 上海科学技术文献出版社 * |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112857950A (en) * | 2021-01-18 | 2021-05-28 | 燕山大学 | Metallographic corrosive agent for biphase medium manganese steel and metallographic structure display method |
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Address after: 214105 No.18 Xiangyun Road, anzhen street, Xishan District, Wuxi City, Jiangsu Province Applicant after: Jiangsu Longda Super Alloy Co.,Ltd. Address before: 214105 No.18 Xiangyun Road, anzhen street, Xishan District, Wuxi City, Jiangsu Province Applicant before: WUXI LONGDA METAL MATERIALS Co.,Ltd. |
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Application publication date: 20200707 |