YUSUF, MUHAMAD (2025) ANALISIS VARIASI TEMPERATUR TEMPERING PADA PROSES HEAT TREATMENT MATERIAL HIGH SPEED STEEL ROD TERHADAP KEKUATAN TARIK. S1 thesis, Universitas Mercu Buana Jakarta.
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Abstract
High Speed Steel (HSS) M35 is widely used in cutting tool industries due to its wear resistance and strength at high temperatures; however, its brittleness requires optimization through heat treatment. This study aims to analyze the effect of tempering temperature variations (560°C, 580°C, 600°C, 620°C) and cooling media (vegetable oil and 5% brine solution) on the tensile strength, toughness, and microstructure of HSS M35. ASTM E8M standard specimens were austenitized at 900°C for 30 minutes, quenched, and tempered according to the specified variations. The results show that vegetable oil cooling at 580°C achieved the highest ultimate tensile strength of 851 MPa with 54% elongation, while the highest approximate toughness of 152,176.80 MPa was obtained at 560°C with oil cooling. Brine cooling produced high strength at certain temperatures (up to 800 MPa at 620°C) but with lower elongation compared to oil. Microstructural analysis revealed that the 580°C oil combination formed tempered martensite with fine, evenly distributed carbides, providing an optimal balance between hardness and ductility. These findings recommend the 580°C oil treatment for applications requiring high tensile strength and wear resistance, and the 560°C oil treatment for applications subjected to high impact loads, confirming that tempering temperature and cooling media significantly affect the mechanical properties and microstructure of HSS M35. Keywords: High Speed Steel M35, heat treatment, tempering, cooling media, tensile strength, approximate toughness, microstructure. Baja High Speed Steel (HSS) M35 banyak digunakan dalam industri alat potong karena ketahanan aus dan kekuatannya pada suhu tinggi, namun sifat getasnya memerlukan optimasi melalui perlakuan panas. Penelitian ini bertujuan menganalisis pengaruh variasi suhu tempering (560°C, 580°C, 600°C, 620°C) dan media pendinginan (minyak sayur dan larutan air garam 5%) terhadap kekuatan tarik, ketangguhan, dan struktur mikro HSS M35. Spesimen standar ASTM E8M diaustenitisasi pada 900°C selama 30 menit, kemudian diquench dan ditempering sesuai variasi yang ditentukan. Hasil pengujian menunjukkan media pendingin minyak pada suhu 580°C menghasilkan kekuatan tarik maksimum tertinggi sebesar 851 MPa dengan regangan 54%, sedangkan nilai approximate toughness tertinggi sebesar 152.176,80 MPa dicapai pada suhu 560°C dengan pendinginan minyak. Pendinginan air garam memberikan kekuatan tinggi pada suhu tertentu (hingga 800 MPa di 620°C) namun dengan regangan lebih rendah dibandingkan minyak. Analisis mikrostruktur menunjukkan kombinasi 580°C minyak membentuk martensit temper dengan distribusi karbida halus yang merata, menghasilkan keseimbangan optimal antara kekerasan dan keuletan. Temuan ini merekomendasikan perlakuan 580°C minyak untuk aplikasi yang memerlukan kekuatan tarik dan ketahanan aus tinggi, serta 560°C minyak untuk aplikasi dengan beban kejut tinggi, sehingga variasi suhu tempering dan media pendinginan terbukti berpengaruh signifikan terhadap sifat mekanik dan struktur mikro HSS M35. Kata kunci: High Speed Steel M35, heat treatment, tempering, media pendinginan, kekuatan tarik, approximate toughness, struktur mikro.
| Item Type: | Thesis (S1) |
|---|---|
| Call Number CD: | FT/MSN. 25 074 |
| NIM/NIDN Creators: | 41320010047 |
| Uncontrolled Keywords: | High Speed Steel M35, heat treatment, tempering, media pendinginan, kekuatan tarik, approximate toughness, struktur mikro |
| Subjects: | 500 Natural Science and Mathematics/Ilmu-ilmu Alam dan Matematika > 530 Physics/Fisika > 536 Heat/Panas 500 Natural Science and Mathematics/Ilmu-ilmu Alam dan Matematika > 530 Physics/Fisika > 536 Heat/Panas > 536.5 Temperature/Temperatur, Suhu 600 Technology/Teknologi > 620 Engineering and Applied Operations/Ilmu Teknik dan operasi Terapan > 621 Applied Physics/Fisika terapan > 621.8 Machine Engineering, Machinery/Teknik Mesin |
| Divisions: | Fakultas Teknik > Teknik Mesin |
| Depositing User: | khalimah |
| Date Deposited: | 28 Aug 2025 08:15 |
| Last Modified: | 28 Aug 2025 08:15 |
| URI: | http://repository.mercubuana.ac.id/id/eprint/97207 |
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