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Wuhan Xinhuafeng Mechanical Manufacturing Co., Ltd.

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Test report of Huazhong University of Science and Technology [Dec 02,2013]
Test report of Huazhong University of Science and Technology

Test unit: Foundry Laboratory, Material College, Huazhong University of Science and Technology

Test report
1Test content
One sample of floating seal ring with the inner diameter of 366mm is subject to  test for the hardness and the microstructure of its section.

2 Test sample preparation
Cut two pieces off from the sample and prepare them by resin mounting; and then test the microhardness and Rockwell hardness after preliminary grinding, accurate grinding and polishing; observe the microstructure after corroding the samples by 5% nitric acid alcohol. The durometer is the Digital Vickers Hardness Tester of American Buehler Company, with 100gf of loading force.

3 Hardness test result
The location of test point is shown as Figure 1
Test result is shown in Table 1.
Table 1 Sample Hardness Distribution
 

Test point
Location description
Rockwell hardness (HRC)
Vickers hardness (HV)

1About 35.1μm away from the upper surface, and about 14.9μm from the right surface
65.4
840.9
 
2Relative to test point 1, 1mm shift to the left
61.5
733.5

3Relative to test point 2, 1mm shift to the left
62
747.5

4Relative to test point 3, 1mm shift to the left
59.1
677.0