A nanohardness measurement method suitable for multiphase molybdenum alloys

A technology of nano-hardness and measurement method, which is applied in the direction of measuring device, testing material hardness, preparation of test samples, etc., can solve the problems of high hardness and difficult to polish, and achieves accurate and efficient measurement method, high application value, and expanded application range. Effect

Active Publication Date: 2021-07-23
CHANGAN UNIV
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Problems solved by technology

In this method, the mechanically polished multiphase molybdenum alloy sample is subjected to electrolytic polishing, and the three-dimensional morphology distribution on the surface of the multiphase molybdenum alloy sample is obtained by utilizing the difference in the electrolytic corrosion rate of different phases in the multiphase molybdenum alloy sample during the electrolytic polishing process. The position of different phases can be directly distinguished in the middle, and the precise measurement of the nanohardness of the multiphase molybdenum alloy can be realized, which solves the problem of nanohardness measurement caused by the excessive hardness of the multiphase molybdenum alloy sample, which is difficult to polish and difficult to distinguish between different phases in the prior art.

Method used

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  • A nanohardness measurement method suitable for multiphase molybdenum alloys
  • A nanohardness measurement method suitable for multiphase molybdenum alloys
  • A nanohardness measurement method suitable for multiphase molybdenum alloys

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Embodiment 1

[0032] This embodiment includes the following steps:

[0033] Step 1, using wire cutting to cut Mo-Si-B alloy samples with a size of 5 mm × 5 mm × 3 mm (length × width × height) on the Mo-Si-B alloy block prepared by powder metallurgy sintering method;

[0034] Step 2. Use 200 mesh, 500 mesh, 800 mesh, 1200 mesh and 2000 mesh silicon carbide sandpaper in sequence to mechanically polish the Mo-Si-B alloy sample cut in step 1 to a depth of 0.3mm, and then perform electrolytic polishing , followed by ultrasonic cleaning and drying with a hair dryer; the electrolytic polishing process is carried out at 20°C to 35°C, the electrolytic cell used is a 250mL glass beaker, and the mechanically polished Mo-Si -B alloy sample is the anode as a whole, and the stainless steel sheet is used as the cathode. The DC voltage is controlled and the voltage is 20V. The electrolytic polishing solution used is a sulfuric acid ethanol solution with a sulfuric acid volume fraction of 10%. During the p...

Embodiment 2

[0042] Step 1, using wire cutting to cut out a Mo-Si-B alloy sample with a size of 5mm×5mm×3mm (length×width×height) on the Mo-Si-B alloy substrate prepared by the laser remelting method;

[0043] Step 2. Use 200 mesh, 500 mesh, 800 mesh, 1200 mesh and 2000 mesh silicon carbide sandpaper in sequence to mechanically polish the Mo-Si-B alloy sample cut in step 1 to a depth of 0.3mm, and then perform electrolytic polishing , followed by ultrasonic cleaning and drying with a hair dryer; the electrolytic polishing process is carried out at 20°C to 35°C, the electrolytic cell used is a 250mL glass beaker, and the mechanically polished Mo-Si The whole of the -B alloy sample is the anode, and the stainless steel sheet is used as the cathode. The DC voltage is controlled and the voltage is 30V. The electrolytic polishing solution used is a sulfuric acid ethanol solution with a sulfuric acid volume fraction of 5%. During the process, slightly shake the anode stainless steel tweezers to ...

Embodiment 3

[0051] The difference between this embodiment and Example 2 is that the voltage used for electropolishing in step two is 25V, the electropolishing solution used is a sulfuric acid ethanol solution with a sulfuric acid volume fraction of 8%, and the electropolishing time is 20s; step three 502 glue is used for pasting.

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Abstract

The invention discloses a nano-hardness measurement method suitable for multi-phase molybdenum alloys. The method comprises the following steps: 1. cutting a multi-phase molybdenum alloy sample; ; 3. Fix the multiphase molybdenum alloy sample after cleaning and drying on the sample stage of the nanoindenter; 4. Calibrate the nanoindenter after fixing the multiphase molybdenum alloy sample and determine the multiphase molybdenum alloy sample Then obtain the three-dimensional topography distribution of the multi-phase molybdenum alloy sample surface and locate the positions of different phases, and then select points for nano-hardness measurement. The present invention uses the difference in electrolytic corrosion rate of different phases in the multiphase molybdenum alloy sample during the electrolytic polishing process to directly distinguish the positions of different phases in the three-dimensional shape distribution of the surface of the multiphase molybdenum alloy sample, and realizes the nanohardness of the multiphase molybdenum alloy. Accurate measurement solves the problems caused by the excessive hardness of multi-phase molybdenum alloy samples in the prior art, which is difficult to polish and difficult to distinguish between different phases.

Description

technical field [0001] The invention belongs to the technical field of hardness measurement of molybdenum alloys, and in particular relates to a nanometer hardness measurement method suitable for multiphase molybdenum alloys. Background technique [0002] Molybdenum (Mo) alloys are considered to be the most attractive candidates for high-temperature applications in the aerospace, nuclear, and metallurgical industries due to their high melting point, low thermal expansion coefficient, high creep resistance, and high-temperature tensile strength. However, molybdenum alloys generally have poor oxidation resistance, and will quickly form MoO in an oxidizing atmosphere at high temperature (above 600 °C). 3 Oxide, due to MoO 3 It is volatile and directly leads to catastrophic degradation of molybdenum alloys. In addition, the brittleness problem and insufficient strength of molybdenum alloys also severely limit their application in industry. Therefore, improving the high-temper...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/28G01N1/32G01N3/06G01N3/42G01Q30/20G01Q60/00
CPCG01N1/286G01N1/32G01N3/06G01N3/068G01N3/42G01N2001/2866G01N2001/2873G01Q30/20G01Q60/00
Inventor 李尧张勇张凤英陈永楠
Owner CHANGAN UNIV
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