This preview shows page 1. Sign up to view the full content.
Unformatted text preview: 4 ) to be carburized (hardened). The carburization conditions keep the carbon surface concentration constant at 0.8% C (assume that only one surface of the plate is exposed). A minimum hardness of R C = 60 is desired for a 2 mm depth from the surface. Describe a procedure that will produce this surface hardening (processing time, cooling procedure, etc.) and state any concerns that you might have. 5. A thick plate of plain carbon steel (composition 0.6 wt%C) is heated to 1000 o C in a dry hydrogen atmosphere to be decarburized. The hydrogen reacts with the carbon to reduce the carbon content at one surface to zero (assume that only one surface of the plate is exposed to hydrogen). After 5 hours the plate is cooled slowly to room temperature and the microstructure is examined. At what depth would one expect to find a microstructure of 35% pearlite and 65% pro-eutectoid (or primary) ferrite?...
View Full Document
- Fall '10
- Mechanical Engineering