Pengaruh Nitridasi Berulang Terhadap White layer, Kekerasan dan Ketebalan Lapisan Pada Material DHA1

SAEFUL ANWAR, Radhian Krisnaputra, S.T.,M.Eng

2018 | Tugas Akhir | D3 TEKNIK MESIN

INTISARI Pada pembuatan komponen kendaraan metode die casting, proses nitridisasi memegang peranan penting dalam peningkatan umur pakai dies. Proses nitridisasi yang dilakukan pada dies sebelum digunakan untuk proses casting bertujuan untuk meningkatkan umur pakai dies. Inovasi dengan melakukan pengulangan proses nitridisasi dies yang sudah dipakai berguna untuk lebih meningkatkan umur pakai dan kapasitas produksinya, sehingga akan mengurangi cost. Proses nitridisasi dilakukan 3 tahap pengulangan, dimana sampel ada 6 buah. Sampel nomer 1 dan 2 dilakukan nitridisasi tiga kali, sampel nomer 3 dan 4 dilakukan nitridisasi dua kali, sampel nomer 5 dan 6 dilakukan nitridisasi satu kali. Pada sampel nomor 1 dan 4 temperatur proses dinaikan 20oC pada proses nitridasi yang kedua. Lapisan yang terbentuk pada setiap tahap pengulangan proses nitridisasi dilakukan karakterisasi berupa pengujian distribusi kekerasan mikro, pengukuran ketebalan lapisan nitriding dan pengukuran ketebalan lapisan white layer. Hasil dari karakterisasi sampel yang mengalami proses nitridisasi berulang menunjukan : Ketebalan lapisan nitriding yang semakin tebal, meningkatnya distribusi kekerasan mikro, bertambahnya tebal compound layer atau white layer yang terbentuk pada permukaan material.

ABSTRACT In the manufacturing process of vehicle components for the die casting method, nitriding process plays an important role in increasing the life of dies. The nitriding process is carried out on dies before being used for the casting process, which aims to increase the life of dies. Innovation is done by the process of repeating nitriding dies that has been used is useful to further increase the service life and production capacity, thereby reducing costs. The nitriding process was carried out in three stages of repetition, in which there were six samples. In samples number 1 and 2, nitriding was carried out three times, samples number 3 and 4 were nitrided twice, samples number 5 and 6 were carried out one-time nitriding. In samples number 1 and 4 the process temperature is increased by 20oC in the second nitriding. The layers formed at each stage of nitriding repetition were characterized in the form of micro hardness distribution testing, nitriding layer thickness measurement and white layer layer thickness measurement. The results of the characterization of samples undergoing repeated nitriding processes show : Thickening of the nitriding layer thickness, increasing the distribution of micro hardness, increasing the thickness of the compound layer or white layer formed on the surface of the material.

Kata Kunci : Gas Nitriding, White Layer, Hardness