Hudha, Miftaqul (2017) Analisa Rekondisi Baja Pegas Daun Bekas SUP 9A Dengan Metode Quench-Temper Pada Temperatur Tempering 480°C Terhadap Kekerasan Dan Kekuatan Tarik. Diploma thesis, Institut Teknologi sepuluh Nopember.
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Abstract
Pada kendaraan mobil, sistem suspensi juga perlu diperhatikan untuk menunjang keamanan dan kenyamanan bagi pengendara. Namun seiring penggunaan dalam jangka waktu yang relatif lama, sifat mekanik pegas juga akan semakin menurun yang menyebabkan kemampuan sistem suspensi pada kendaraan dalam menerima beban dinamis kurang maksimal. Penelitian ini dilakukan dengan merekondisi pegas daun yang telah terpakai (bekas) untuk mengembalikan sifat mekanik pegas daun yang telah terpakai sehingga layak digunakan kembali.
Metodologi pada penelitian ini dilakukan dengan uji laku panas dengan proses pemanasan pada temperatur 8500C dengan holding time 60 menit, dilakukan proses quenching menggunakan media pendinginan air bervolume 20 Liter disertai agitasi, dilakukan proses Tempering pada temperatur 4800C dengan holding time 90 menit dan didinginkan dengan media udara, kemudian dilakukan uji tarik dan uji kekerasan.
Material pegas daun setelah mengalami proses quench-temper pada temperatur 480oC diperoleh kekerasan sebesar 43,01 HRC (400,09 HBN), kekuatan luluh 825,387 MPa, dan kekuatan tarik 1017,146 MPa. Proses rekondisi tidak dapat mengembalikan sifat mekanik seutuhnya.
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In car vehicle, suspension system on the vehicle also needs to be considered in order to support the safety and comfort for the rider. As the use over a relatively long period of time, the mechanical properties of the spring will also decrease which causes the ability of the suspension systems to receive dynamic load are not maximum. This research is with reconditioning leaf spring that has been used (secondhand) to return the of leaf spring that have been used so that feasible to be used again.
Methods in this research begin heat treatment at 850 ᵒC with 60 minutes holding time and quenching cooled using 20 liters of water by means of agitation, then tempering process is done at 480 ᵒC with 90 minutes holding time and cooled by air, lastly hardness and tensile tests.
Test results on steel reconditioned process with quench tempered at temperature 480°C hardness of 43.01 HRC (400,09 HBN), yield strength 825,387 MPa, tensile strength 1017146 MPa,. So the recondition results cannot restore mechanical properties completely.
| Item Type: | Thesis (Diploma) |
|---|---|
| Additional Information: | RSMI Hud a-1 |
| Uncontrolled Keywords: | Rekondisi, Pegas Daun, Quenching, Tempering, Sifat Mekanik. |
| Subjects: | T Technology > TN Mining engineering. Metallurgy > TN752.I5 Steel--Heat treatment T Technology > TS Manufactures > TS156 Quality Control. QFD. Taguchi methods (Quality control) |
| Divisions: | Faculty of Industrial Technology > Mechanical Engineering > 21401-(D3) Diploma 3 |
| Depositing User: | Hudha Miftaqul |
| Date Deposited: | 12 Jan 2018 08:28 |
| Last Modified: | 05 Mar 2019 04:37 |
| URI: | http://repository.its.ac.id/id/eprint/47780 |
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