CHSC LAB 7 - Mike Borton CHSC 2205 SET 2A Partners Garret...

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Mike Borton CHSC 2205 SET 2A Partners: Garret Jan 22/07 ENGINEERING MATERIALS LAB NO.7 CASE HARDENING
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Objective: Prepare, examine, sketch and interpret the microstructures of a case- hardened steel. Measure the superficial hardness of case-hardened steel samples. Theory: Case hardening is done by exposing an article to a high carbon environment at a high temperature. This is done to components that require very hard surfaces for wear resistance and soft, tough inner cores that resist impact fracture. Some examples include gears, sprockets and some bearings. The articles that are to be carburized are placed into a molten salt bath heated to 1550-1750F. At high temperatures, the excess carbon diffuses into the steel surface. This forms a carbon layer at the surface of a low-carbon steel article with a thickness of 0.20-0.25 inches. The article can be quenched to form martensite at the surface and then tempered. The core steel remains at it’s original low carbon content and therefore cannot form martensite even after heating and quenching.
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This note was uploaded on 04/30/2008 for the course CHSC 1489 taught by Professor Straff during the Spring '08 term at British Columbia Institute of Technology.

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CHSC LAB 7 - Mike Borton CHSC 2205 SET 2A Partners Garret...

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