SAINS, KHISNI (2017) STUDI EKSPERIMENTAL PENGARUH VARIASI TEMPERATUR DAN WAKTU PENAHANAN PARTITIONING PADA PROSESQUENCHING -PARTITIONING BAJA JIS S45C DI BAWAH TEMPERATUR MARTENSITE START. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Proses perlakuan panas quenching-partitioning merupakan proses perlakuan panas yang baru beberapa tahun ini dikembangkan. Proses ini mempunyai tahapan yang sama dengan proses perlakuan panas quenching-tempering. Bila pada proses quenching-tempering didapatkan fase akhir 100% tempered martensite, maka pada proses quenching-partitioning didapatkan fase akhir berupa tempered martensite dan retained autenite sehimgga dihasilkan baja yang tangguh dan ulet.
Proses perlakuan panas quenching-partitioning dilakukan pada baja JIS S45C dengan pemanasan dalam dapur sampai temperatur austenisasi 900°C dengan waktu tahan 4 jam. Proses dilanjutkan dengan quenching ke dalam air selama 10 detik hingga mencapai temperatur 230°C lalu di-partition dalam furnace berisi campuran NaN03, KNO3, dan NaNO2, pada temperatur partitioning yang divariasikan 275°C, 300°C, 325°C, dan 350°C dengan variasi waktu penahanan 10 detik, 100 detik, dan 1000 detik kemudian di-quench kembali ke dalam air. Sifat mekanik dan struktur mikro dari material hasil proses perlakuan panas diuji dengan pengujian tarik, pengujian kekerasan, dan pengamatan menggunakan mikroskop optik.
Hasil yang didapatkan dari penelitian ini adalah peningkatan temperatur dan waktu penahanan partitioning akan meningkatkan persentase pertambahan panjang (elongation), persentase penyusutan area (reduction area), dan ketangguhan baja JIS S45C, namun yield strength, kekuatan UTS, dan kekerasan menurun.
Kata kunci: quenching-partitioning, baja JIS S45C, sifat mekanik
=========================================================================================== Quenching-partitioning process is a novel steel heat treatment. This process involves the same steps with quenching-tempering process. Quenching-partitioning process produces 100% tempered martensite while quenching-partitioning process produces tempered martensite and retained austenite. Obtaining tough and ductile steel.
The experiment begins by heating the steel (JIS S45C Steel) up to 900°C for 4 hours. The very steel then quenched in water as the media for 10 seconds. Followed by reheating process in salt bath to various temperature from 275°C, 300°C, 325°C, and 350°C, and various partitioning time from 10 seconds, 100 seconds, and 1000 seconds. The post-partitioning cooling media is water. The next step is to test the treated specimen to see the changes in mechanical properties and microstructure. The tests are tensile test, hardness test, and metallography test.
The results indicates that there are improvements in elongation, reduction area and toughness along with increasing partitioning’s time and temperature. While the yield strength, UTS, and hardness are decreasing.
Keywords: quenching-partitioning, JIS S45C, mechanical properties
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Uncontrolled Keywords: | quenching-partitioning,baja JIS S45C, sifat mekanik |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) > TA418.9 Composite materials. Laminated materials. T Technology > TJ Mechanical engineering and machinery |
| Divisions: | Faculty of Industrial Technology > Mechanical Engineering > 21201-(S1) Undergraduate Thesis |
| Depositing User: | - KHISNI SAINS |
| Date Deposited: | 25 Jan 2017 09:11 |
| Last Modified: | 25 Jan 2017 09:11 |
| URI: | http://repository.its.ac.id/id/eprint/3361 |
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