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Ferrous Metals
Material and Processes
| Question | Answer |
|---|---|
| Any alloy metal with iron as its chief ingredient is considered | Ferrous |
| Steel is iron with | carbon added |
| SAE classifies steel with a four digit number: 1st = primary alloying agent, 2nd = percent of alloying agent and the last two are? | the percent in hundreths of carbon |
| What does normalizing do? | Relieves inner stresses |
| What should be done after welding a piece of steel? | Normalizing to relieve inner stresses |
| Normalizing is applicable to | only ferrous metal |
| What is hardening? | Heated to critical temperature and cooled quickly |
| Waht are three types of quenching mediums? | water, oil, or brine |
| Which is the fastest quenching medium? | brine |
| What is tempering? | Reduces the brittleness imparted by hardening |
| Tempering always follows what? | Hardening |
| Name the two methods of casehardening. | Carburizing and Nitriding |
| What produces a hard wear-resistant surface, or case, over a strong, tough core? | Casehardening |
| Forms a thin layer of high-carbon steel on low carbon steel | Carburizing |
| Placed in a 1000*F furnace with ammonia gas. The hydrogen burns up and the nitrogen is absorbed into the metal. | Nitriding |
| Name the three methods of carburizing. | Pack, Gas, and Liquid carburizing |
| Packed in a container with charcoal or some other mineral rich in carbon | Pack carburizing |
| Burning oil, wood or other material in the furnace area and carbon monoxide is introduced | Gas carburizing |
| Placed in molten salt bath that contains the chemical required to produce a carbon reaction | Liquid carburizing |
| Differs from carburizing in that a part is first hardened, tempered, and then ground to its finished dimensions before it is casehardened. | Nitriding |
| Surrounded by ammonia gas | Nitriding |
| What aircraft engine parts are commonly nitrided for increased wear resistance? | Crankshaft and cylinder walls |
| Brinell Hardness Test | Test for hardness of metal |
| Why is steel tempered after being hardened? | To relieve its internal stresses and reduce its brittleness |
| What is descriptive of the annealing process of steel during and after it has been annealed? | Slow cooling; Low strength |
Created by:
bruteybrat@aol.com
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