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Room-temperature tensile test method for high-strength steel

A tensile test and high-strength steel technology, which is applied in the field of room temperature tensile test of high-strength steel, can solve the problems of large dispersion of values, inconsistent curvature of the elastic section of the tensile curve, and non-conformity, and achieves reliable data support and simple test methods. convenient effects

Inactive Publication Date: 2021-01-01
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The testers measured the yield strength of high-strength steel according to the national standard and found that the curvature of the elastic section of the tensile curve of the material is inconsistent. When the value range of the elastic section is different, R p0.2 The value dispersion is large, resulting in R p0.2 is not a stable value

Method used

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  • Room-temperature tensile test method for high-strength steel
  • Room-temperature tensile test method for high-strength steel
  • Room-temperature tensile test method for high-strength steel

Examples

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Embodiment 1

[0049] The invention provides a room temperature tensile test method for the specified plastic elongation strength of high-strength steel (13Cr4Ni), and its process parameters are:

[0050] The beam displacement rate is 0.5mm / min. The starting point of the hysteresis ring exceeds the strength when the material is expected to yield, and is lower than the expected specified plastic extension strength value, and the reverse point under the hysteresis ring is the starting value of 10%.

[0051] The test temperature of the tensile test is 25°C.

[0052] Using the Zwick Z050 testing machine, the starting point of the hysteresis loop is set to 830MPa, and the reverse point of the hysteresis loop is set to 83MPa.

[0053] Start the test. After the sample is loaded to the starting point of the hysteresis ring at the beam displacement rate of 0.5mm / min, it is unloaded at the same rate. Variable speed (3.5mm / min) until the sample breaks.

[0054] Figure 7 As shown, the hysteresis lo...

Embodiment 2

[0058] The invention provides a room temperature tensile test method for the specified plastic elongation strength of high-strength steel (13Cr4Ni), and its process parameters are:

[0059] The beam displacement rate is 0.5mm / min. The starting point of the hysteresis ring exceeds the strength when the material is expected to yield, and is lower than the expected specified plastic extension strength value, and the reverse point under the hysteresis ring is the starting value of 10%.

[0060] The test temperature of the tensile test is 25°C.

[0061] Using the Zwick Z050 testing machine, the starting point of the hysteresis loop is set to 860MPa, and the reverse point of the hysteresis loop is set to 86MPa.

[0062] Start the test. After the sample is loaded to the starting point of the hysteresis ring at the beam displacement rate of 0.5mm / min, it is unloaded at the same rate. Variable speed (3.5mm / min) until the sample breaks.

[0063] Figure 8 As shown, the hysteresis lo...

Embodiment 3

[0067] The invention provides a room temperature tensile test method for the specified plastic elongation strength of high-strength steel (13Cr4Ni), and its process parameters are:

[0068] The beam displacement rate is 0.5mm / min. The starting point of the hysteresis ring exceeds the strength when the material is expected to yield, and is lower than the expected specified plastic extension strength value, and the reverse point under the hysteresis ring is the starting value of 10%.

[0069] The test temperature of the tensile test is 25°C.

[0070] Using the Zwick Z050 testing machine, the starting point of the hysteresis loop is set to 890MPa, and the reverse point of the hysteresis loop is set to 89MPa.

[0071] Start the test. After the sample is loaded to the starting point of the hysteresis ring at the beam displacement rate of 0.5mm / min, it is unloaded at the same rate. Variable speed (3.5mm / min) until the sample breaks.

[0072] Figure 9 As shown, the hysteresis lo...

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Abstract

The invention relates to the field of room-temperature static-load tensile tests of metal materials, and aims to provide a room-temperature tensile test method of high-strength steel. The method specifically comprises the steps of firstly determining a hysteresis loop starting preliminarily through a set of conventional tests, wherein the hysteresis loop starting point is set to be a stress valuehigher than the expected strength at the beginning of yielding and lower than the expected specified plastic extension strength, and a reverse point under the hysteresis loop is a stress value 10% ofthe hysteresis loop starting point; and finally, determining a straight line to be translated through a hysteresis loop method. According to the invention, the consistency of specified plastic extension strength in room-temperature tensile tests of high-strength steel and similar materials is ensured, and data results obtained by different test institutions or departments are ensured to have consistency and comparability.

Description

technical field [0001] The invention relates to the field of room temperature static load tensile test of metal materials, and aims to provide a room temperature tensile test method for high-strength steel. Background technique [0002] According to my country's mid-to-long-term scientific and technological development requirements in the 21st century, aerospace, transportation, nuclear power and other defense industries have higher and higher demands on the strength and toughness of materials. High strength and high toughness are the development trend of steel materials. Low-carbon martensitic high-strength steel is widely used in load-bearing components in some important industries due to its high strength and high toughness, which significantly improves the service life and bearing capacity of components. [0003] Specified plastic elongation strength (commonly known as yield strength, R p0.2 ) is one of the important mechanical performance indicators of high-strength st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08
CPCG01N3/08G01N2203/0017G01N2203/0067G01N2203/0075G01N2203/0222
Inventor 时园园蔡静王培侯瑞李红军袁晨周斌蔡林高学邈张重远
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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