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Valve is the equipment to control the amount of intake air to the combustion chamber and the emission of exhaust of gas from the combustion chamber in a combustion engine. Valve must fulfill some requirements such as good wear resistance, good fatigue resistance, and good high temperature resistance...
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| Format: | Final Project |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/13157 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Valve is the equipment to control the amount of intake air to the combustion chamber and the emission of exhaust of gas from the combustion chamber in a combustion engine. Valve must fulfill some requirements such as good wear resistance, good fatigue resistance, and good high temperature resistance. After heat treatment in the production line, the hardness of the valve is lower than specification. This is become the main problem during valve production.<p>The objective of this research is to study the effect of tempering process (time and temperature) on the hardness of JIS SUH-3 valve material. The tempering processes are conducted by varying heating temperature (700oC-800oC) and holding time (30, 60, and 90 minutes). The hardness and microstructure afterheat treatment are examined.<p>The maximum hardness of 321 HV0,2 was obtained after tempering at 750oC for 30 minutes produces maximum hardness. When tempering was conducted at 800oC for 60 and 90 minutes, the hardness drops below minimum specification (284 HV0,2).<p>Microstructures of valve materials after tempering consist of ferrite and alloy carbide, mostly chromium carbide. Molybdenum alloy carbide is formed at higher tempering temperature (775oC-800oC). Hardness value depends on the nucleation and growth of carbides during tempering. The microstructure of specimen with the hardness above 284 HV0,2 consists of fine and dispersed carbides. The specimen's hardness decreasing with increasing both carbide particle size and ferrite grain size respectively. <br />
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