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Polyphase material each ingredient phase content test method

A technology of multi-phase materials and testing methods, applied in the direction of testing material hardness, preparation of test samples, etc.

Active Publication Date: 2008-03-19
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the application of nanoindentation technology in measuring the content of each constituent phase in multiphase materials has not yet been reported in literature and patents.

Method used

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  • Polyphase material each ingredient phase content test method
  • Polyphase material each ingredient phase content test method
  • Polyphase material each ingredient phase content test method

Examples

Experimental program
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Effect test

Embodiment 1

[0043] The multiphase material tested is a ferrite-martensite dual-phase steel, and the average grain diameters of ferrite and martensite are 3.0 μm and 1.3 μm, respectively. A test area was randomly selected on the sample, and 120 indentation tests were performed. The 120 indentation points constituted a 12×10 rectangular grid with a pitch of 5 μm. During the test, the Berkovich diamond indenter was used, and the radius of curvature of the tip was -1 .

[0044] After the test, 120 hardness-Young's modulus data pairs were obtained, and the scatter diagram is shown in Figure 2. It can be seen from the figure that the 12 points with higher hardness values ​​gather into a group, indicating that 12 points fall on the harder martensite phase in the dual-phase steel during the test; the remaining 108 points with lower hardness values ​​gather into a group, It shows that 108 points fell on the softer ferrite phase in the dual phase steel during the test. It can be concluded that th...

Embodiment 2

[0047] The multiphase material tested is a ferrite-carbide dual-phase steel, and the average diameter of carbide particles is 0.5 μm. Three test areas were randomly selected on the sample, and 40 indentation tests were performed on each area. The 40 indentation points constituted an 8×5 rectangular grid with a pitch of 5 μm. During the test, a Berkovich diamond indenter was used, the radius of curvature of the tip was 1 .

[0048] After the test, 120 hardness-Young's modulus data pairs were obtained, and these data were summarized in a scatter diagram, as shown in Figure 3. It can be seen from the figure that 9 points with higher hardness values ​​are gathered into a group, indicating that 9 points fall on the harder carbide particles in the dual-phase steel during the test; the remaining 111 points with lower hardness values ​​are gathered into a group, indicating that During the test, 111 points fell on the softer ferrite phase in the dual phase steel. It can be concluded ...

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Abstract

The invention discloses a nanometer press in testing method of the content of each constituent phase in heterogeneous material. The method tests the content of each constituent phase in the heterogeneous material by using the nanometer press in technology and the microindent characteristic, therefore, the invention has a substantive difference with other methods which are used to test the content of each constituent phase in the heterogeneous material. The method can achieve the testing of three parameters of the content of each constituent phase, the hardness and the Young modulus synchronously, to estimate the drop point of the press in testing each time (the press in point is positioned on which phase of the heterogeneous material), to get the content of each phase. The method of the invention is not only suitable for the heterogeneous materials of metal, macromolecule and ceramics, etc. which are combined by multi-class of different materials, but also suitable for the heterogeneous material which is combined by different phases in single-class material.

Description

technical field [0001] The invention relates to a method for testing the content of each constituent phase in a multiphase material, in particular, the invention relates to a method for testing the content of each constituent phase in a multiphase material by nano-indentation. Background technique [0002] Multiphase materials cover a wide range, which can be a combination of metals, polymers, ceramics and other materials, or a combination of phases of a single material. One of the main advantages of multiphase materials is that they can be designed according to the requirements of use, so that they can take into account the excellent characteristics of each component phase. The content and properties of each constituent phase are essential elements in the research and design of multiphase materials, so they have become the focus of material researchers. [0003] There are many conventional methods for testing the content of each constituent phase in multiphase materials, s...

Claims

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Application Information

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IPC IPC(8): G01N3/40G01N1/32
Inventor 王秀芳杨晓萍宋洪伟史弼
Owner BAOSHAN IRON & STEEL CO LTD
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