WIJAYA, ALAMIN JAYA (2025) ANALISIS PERBANDINGAN SIFAT MEKANIS DAN MIKROSTRUKTUR BLOK MESIN SEPEDA MOTOR LOKAL DAN IMPOR. S1 thesis, Universitas Mercu Buana Jakarta.
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Abstract
Motorcycle engine blocks are critical components that significantly influence engine performance and durability. This study aims to analyze the differences in the mechanical properties and microstructure of local and imported motorcycle engine blocks. The research involved hardness testing to assess mechanical properties and microstructure analysis using a metallurgical microscope. The tested samples consisted of local and imported engine blocks with comparable engine capacities. The results indicated that imported engine blocks had an average hardness of 15.6 HRC, which was higher than the 9.5 HRC observed in local engine blocks. The microstructure of the imported materials showed a more homogeneous distribution of pearlite, while the local materials were predominantly ferrite. The higher hardness of the imported engine blocks contributed to superior resistance against friction and wear, crucial for operations under demanding conditions. This study offers valuable insights for enhancing the competitiveness of local engine block materials in the global market. Recommendations include improving material quality through innovations in manufacturing processes and heat treatment. Keywords: Mechanical properties, microstructure, motorcycle engine block. Blok mesin sepeda motor merupakan komponen vital yang memengaruhi kinerja dan daya tahan mesin. Penelitian bertujuan untuk menganalisis perbedaan sifat mekanis dan mikrostruktur blok mesin sepeda motor lokal dan impor. Penelitian dilakukan dengan uji kekerasan untuk mengukur sifat mekanis, serta uji mikrostruktur menggunakan mikroskop metalurgi. Sampel yang diuji meliputi blok mesin lokal dan impor dengan kapasitas mesin serupa. Hasil pengujian menunjukkan bahwa blok mesin impor memiliki nilai kekerasan rata-rata 15,6 HRC, lebih tinggi dibandingkan blok mesin lokal yang hanya 9,5 HRC. Mikrostruktur material impor menunjukkan distribusi perlit yang lebih homogen, sedangkan material lokal didominasi oleh ferit. Kekerasan yang lebih tinggi pada blok mesin impor berkontribusi pada daya tahan yang lebih baik terhadap gesekan dan keausan, yang sangat penting dalam kondisi operasional berat. Kesimpulan penelitian memberikan wawasan penting bagi pengembangan material blok mesin agar lebih kompetitif dalam pasar global. Rekomendasi meliputi peningkatan kualitas material melalui inovasi proses manufaktur dan perlakuan panas. Kata Kunci: Sifat mekanis, mikrostruktur, blok mesin sepeda motor
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