SM20C의 금속현미경 실험

소개글

열처리된 SM20C의 표면을 현미경으로 관찰하고 어떤 열처리가 돼있는지 추측하였다.

목차

1. Abstract
2. Introduction
3. Methods
4. Results
5. Discussion
6. Conclusion
7. Reference
8. Appendices

본문내용

Introduction
In this test, we implement metallurgical test for two SM20C specimens. SM20C is carbon steel whose mechanical properties are influenced by carbon contents and refined structure made by various heat treatments. Size of specimens is 3cmX3cmX1cm. One is non-heat treated and another is heat treated one. Then compare their structure using an optical microscope.
There are many types of heat-treatment. Typical Types are as follows;
Annealing(풀림) is operation of heating material to the proper constant temperature and hold temperature for a while before cooling it down slowly. Purpose of this treatment is lowering hardness and strength, increasing formability of material. Also we can get homogeneous structure and remove internal stress. It makes grain size larger.
Normalizing(불림) is heating material to proper temperature and then cooling it in the air. Heating to the temperature that is 40~60℃ above A, A3 to make homogeneous austenitic phase then cooling it in the air.

참고 자료

Metallography Specimen Preparation and Examination, 1st ed. Materials of Engineering, LSU, 2016.
"재료이야기 #06. 재료공학의 레시피, Phase Diagram(상평형도) (2)", STEMentor. [Online]. Available: http://stementor.tistory.com/entry/%EC%9E%AC%EB%A3%8C%EC%9D%B4%EC%95%BC%EA%B8%B0-06-%EC%9E%AC%EB%A3%8C%EA%B3%B5%ED%95%99%EC%9D%98-%EB%A0%88%EC%8B%9C%ED%94%BC-Phase-Diagram%EC%83%81%ED%8F%89%ED%98%95%EB%8F%84-2. [Accessed: 26- Nov- 2016].
Soild Material Test Manual, 1st ed. .
대. 정, 준. 장, 범. 전 and 경. 임, SM45C 탄소강 열처리에 대한 연구, 1st ed. .
"Metallurgy Of Carbon Steel", Gowelding.com. [Online]. Available: http://www.gowelding.com/met/carbon.htm. [Accessed: 26- Nov- 2016].