PENGARUH SUHU TEMPER TERHADAP STRUKTUR MIKRO, KEKERASAN, DAN KETAHANAN AUS BAJA KARBON HQ 709
| Main Author: | Surahman, Surahman |
|---|---|
| Format: | Article info application/pdf eJournal |
| Bahasa: | eng |
| Terbitan: |
Jurnal Nosel
, 2014
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| Online Access: |
http://jurnal.fkip.uns.ac.id/index.php/ptm/article/view/8160 http://jurnal.fkip.uns.ac.id/index.php/ptm/article/view/8160/5924 |
Daftar Isi:
- The use of carbon steel HQ 709 as gears, crank shaft, shaft, and engine components in addition to requiring hardness properties also require wear resistance and toughness properties. To get the properties of carbon steel with a combination of hardness, plasticity, ductility, strength, wear resistance, and stable crystalline structure necessary tempering process. Tempering is an attempt to reduce the residual stress of materials with a decrease hardness material. The purpose of the study were : to investigate how the effect of tempering temperature variations to changes in the carbon steel microstructure HQ 709, to investigate the effect of tempering temperature variation to changes in carbon steel hardness HQ 709, to investigate the effect of tempering temperature variation to changes in wear resistance of carbon steel HQ 709, to investigate the interaction between changes in the microstructure, hardness and wear resistance due to the tempering temperature variations. Research using experimental methods and techniques of data analysis using descriptive analysis is to directly observe and then experimental results and determine the results of the study concluded. Based on the results of the study concluded that: there is the effect of tempered temperature variations on the microstructure of steel HQ 709, there is the effect of tempered temperature variation of the hardness levels steel HQ 709. Based on the results of hardness testing, heat treatment specimens obtained average level of the highest hardness at 870 ° C quenched specimens with holding time is 30 minutes for 560.97 VHN and the lowest average hardness of the specimen tempering 650 ° C with a holding time of 30 min 287.4 VHN, there is the effect of tempered temperature variations on the wear resistance of steel HQ 709. Based on the results of testing the wear resistance, heat treatment specimens obtained an average rate of wear of the highest numbers of specimens tempered at 650 ° C with a holding time 30 min at 0.873 × 10-7 mm2/Kg and the average wear rate lowest in quenching the specimen 870 ° C with a holding time of 30 minutes 0.3 × 10-7 mm2/Kg, there is an interaction between changes in the microstructure, hardness, and wear resistance of steel 709 HQ. Such changes have a certain pattern of interaction or relationship.