Charpy impact test

목차

1. Introduction
2. Theoretical background
3. Test procedure
4. Result
5. Conclusion

본문내용

1. Introduction
The Charpy V-notch test continues to be the most utilized and accepted impact test in use in the industry. It is written into many specifications and easily adaptable as an acceptability standard on whether or not parts are apt to behave in a brittle manner in the temperature range in which they are likely to be used.
At this time, the specimens are handled by annealing and quenching. Then, conduct Charpy V-notch test with 0.3 wt% C steel specimens. After the test, obtain the breaking energy by the tester. Also, calculate the impact strength by dividing breaking energy into cross-sectional area. After that, observe the fractography by SEM to compare brittle and ductile characteristics when the specimen is fractured [1].

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3. Test procedure
3.1 Heat treatment
In 0.3 wt% C steel, as can be seen at table 1, specimen #1 is maintained for 2 hours at 845 ˚C and then be cooled in the furnace. Specimen #2 is quenched in cold water after maintained for 2 hours at 925 ˚C in the furnace [4].

참고 자료

ASM, 2000, “Mechanical Testing and Evaluation”, Vol. 8, pp. 1355-1359.
ASTM, 2012, “Standard Test Methods for Notched Bar Impact Testing of Metallic Materials”, E23-12C, pp. 2-5, 10, 14.
Young-Ha Yeom, 1992, “The method of materials experiment”, Donmyungsa, pp. 162, 163, 176-178.
ASM, 2000, “Heat treating”, Vol. 4, pp 102, 111, 160.
ASM, 1987, “Fractography”, Vol. 12, pp. 9, 35, 41, 312.
Eds. H. Bethge and J. Heydenreich. Elsevier, 1987, "Electron Microscopy in Solid State Physics", pp. 368~371.