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Abstract: <br /> <br /> <br /> <br /> <br /> <br /> <br /> AISI H13 is a kind of hot work tool steel with medium carbon content (0.3% to 0.4%) and chromium content of 4.75 to 5.5%. It is commonly used to make tools <br /> <br /> &l...
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| Format: | Final Project |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/6539 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Abstract: <br />
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AISI H13 is a kind of hot work tool steel with medium carbon content (0.3% to 0.4%) and chromium content of 4.75 to 5.5%. It is commonly used to make tools <br />
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such as die, mould, and cutting tools. AISI H13 is always delivered in annealed condition that make this steel very soft and not suitable to be used in their most applications those need good combination of hardness, wear resistance, and toughness. In order to meet this requirement, microstructure of the steel should be <br />
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modified. One of the most common method is by giving hardening and tempering heat treatment. Hardening and tempering is a cycle of heat treatment where steel is heat treated into austenite phase region and fast cooled to room temperature to produce martensitic microstructure, and then reheated again to recrystallizing temperature (usually 100 oC-700 oC). The purpose is to produce steel with good combination of strength, hardness, and toughness. The most important parameters that affect these microstructural changes and mechanical properties are cooling rate, hardening <br />
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(austenitizing) temperature and time, tempering temperature and time, and number of tempers. <br />
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Parameters used in this study were hardening temperature (1020 oC, 1050 oC, and 1080 oC), tempering temperature (540 oC, 593 oC, dan 620 oC), and number of tempers <br />
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(single and triple tempering). The main results can be summarized as: 1) An increase in hardening temperature resulted in increased hardness until 60% and decreased <br />
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impact toughness of maximally 75%.2) Triple tempering gives an increase in impact <br />
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toughness of up to 80% in compare with single tempering. The decrease in hardness is only about 5 HRC. 3) An increase in tempering temperature will increase impact <br />
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toughness and decrease hardness. 4) H13 tool steels hardened at 1050 oC followed by <br />
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single tempering at 620 oC and triple tempering at 593 oC have the most optimal <br />
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combination of toughness and hardness among all samples. |
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