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Definition
*study
*extraction and purification of metals from their ores |
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Definition
*study
*effect of stress
*time,temp., rate of heating and cooling
*effects of environment |
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Definition
*study
*effect of material microstructure on the properties of metals |
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Definition
*ferrous (iron and steel)
*non-ferrous |
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Definition
*heat treating process
*causes the outer surface of a material to become very hard and wear resistant
*while maintaining a softer and more ductile inner core |
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Definition
*stress-relieving method
*metal is heated to a temperature below the lower transformation temp.
*then slowly cooled to room temp. |
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Definition
*process
*reheating metal immediately after quenching for the purpose of increasing ductility or relieving stress |
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Definition
| *used to harden and strengthen the blade |
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Term
| atoms with an unequal # of protons and electrons |
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Definition
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| a pure substance composed of a single material |
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Definition
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| 2 or more metals dissolved together in a solid solution |
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| In which hardness testing method is the hardness based on the diameter of an indenture? |
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| In which hardness testing method does the impression look like a diamond, with one axis seven times as long than the other? |
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| What hardness testing method is the most widely used of all methods? |
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Definition
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| In which hardness testing method is the hardness value dependent on the height of the bounce? |
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Definition
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Term
| In which 2 hardness testing methods is the hardness depedndent on the depth of penetration rather than the width of penetration |
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Definition
| rockwell, rockwell superficial |
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Term
| In which hardness testing method is a diamond-tipped magnetostrictive rod used? |
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Definition
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Term
| In which hardness testing methods is a minor load applied first to get through the outher surface of the metal before making the hardness test |
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Definition
| rockwell, rockwell superficial |
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Term
| In most hardness testing methods,the surface should be as horizontal and as flat and smooth as possible. In which hardness testing method is this the most critical |
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Definition
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Term
| In which hardness testing method is the hardness dependent on the width of a square, diamond-shaped impression |
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Definition
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Term
| In which hardness testing method is a very small impression made by a diamond penetrator using a load so small it is measured in grams instead of kilograms |
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Definition
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Term
| What hardness testing method employs either a C,AE,G or K scale |
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Definition
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| List the hardness testing method that measure hardness in units of BHN |
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Definition
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Term
| microhardness tester is another name for which hardness testing methods |
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Definition
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Term
| what hardness testing method uses a 10mm diamter ball and a 3000 kg force |
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Definition
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| the 30T scale refers to which hardness testing method |
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Definition
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Term
| name the hardness testing method that measures in units of DPH |
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Definition
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Term
| name the hardness testing method that involves scratching a surface with 10 stones |
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Definition
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Term
| name a hardness testing method that uses either a diamon-point penetrator or a ball penetrator, with loads of 15 kg, 30 kg, 45kg |
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Definition
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Term
| which hardness testing method is the fastest to use, but does not give accurate numerical results |
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Definition
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Term
| in the 45T scale, what does the 45 stand for |
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Definition
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Term
| what is the greatest hardness value, in rockwell units, that steel can attain |
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Definition
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Term
| which rockwell hardness scale is most commonly used for hard materials |
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Definition
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Term
| in the rockwell hardness test, what scales use the diamond- point penetrator |
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Definition
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Definition
*measure of resistance to deformation
*measure of resistance to penetration
*resistance to damage by denting, scratching, wearing, etc. due to any force or pressure |
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Term
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Definition
1.strength
2.brittleness
3.ductility
4.machinability
5.formability
6.toughness
7.cracking |
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Term
*accurate/precise
*dependable
*expensive
*complex
*time consuming |
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Definition
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*fast
*inexpensive
*easy/simple
*crude
*inaccurate |
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Definition
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Term
| what are the scratch hardness tests? |
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Definition
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Term
| units that hardness is measured in |
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Definition
*BHN
*DPH
*Shore units
*Knoop units
*Rc
*15N |
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Term
| 1st precise quantitative hardness test for metals? |
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Definition
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Term
Step 1-the sample is placed on the anvile
step 2-the penetrator contacts & indents the sample
step 3-the penetrator is release
step 4-a microscope w/ a calibrated lens is used to measure the diameter of the dent |
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Definition
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Term
| hardness value of brinell hardness test? |
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Definition
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Term
| which hardness testing method is restricted to softer steels or other softer metals |
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Definition
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Definition
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Term
| penetrator of Brinell test |
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Definition
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Definition
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Definition
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Term
| what testing use smaller loads and sharply pointed penetrators to make very small indentions? |
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Definition
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Term
| what are the 2 types of microhardness testing? |
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Definition
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Term
| what test can be used on harder materials bc the pointed penetrator can probe into a hard surface more easily than a ball penetrator can? |
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Definition
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Definition
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Term
| has a diamond cross section known as "elongated pyramid" |
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Definition
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Term
| which testing method does no damage to the specimen |
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Definition
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Term
| which testing method can be sued on very thin materials |
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Definition
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Term
| which testing method can be used on very small surface areas |
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Definition
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Definition
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Definition
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Step 1- sample is placed on the anvil.
Step 2-sample is raised to penetrator after placement and minor load is applied.
Step3-major load is applied and scale is read
Step 4-sample is lowered |
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Definition
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Term
| Eliminates the effects of small surface imperfections by applying a preliminary load to the sample before the hardness test is taken |
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Definition
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Term
| which testing method is very accurate |
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Definition
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Term
| minor load greatly reduces or eliminates the effect of surface imperfections |
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Definition
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Term
| which testing method has human error reduced bc the hardness value can be read directly from a scale |
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Definition
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Term
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Definition
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Term
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Definition
*diamond point
*diamond
*1/16" ball
1/8" ball |
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Term
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Definition
*Diamond point-60 kg
*Diamond-150 kg
*1/16" ball-100 kg
*1/8" ball-60 kg |
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Definition
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Term
| Tests the hardness closer to the outside surface of the metal |
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Definition
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Term
| thin materials can be tested |
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Definition
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Term
| hardness near the surface can be tested |
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Definition
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Term
| case-hardened surfaces can be tested |
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Definition
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Term
| Rockwell superficial basis |
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Definition
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Term
| Rockwell superficial penetrator |
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Definition
*diamond point
*1/16" ball
1/8" ball |
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Term
| Rockwell superficial load |
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Definition
*diamond point- 15kg, 30kg
*1/16" ball- 15kg, 30 kg
*1/8"ball- 30kg, 45kg |
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Term
| Rockwell superficial scale |
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Definition
Diamond point- 15N,30N
1/16" ball- 15T,30T
1/8" ball- 30W,45W |
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Term
| the surface is not penetrated by a diamond-point or ball penetrator |
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Definition
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Term
| hammer ball is dropped onto the sample |
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Definition
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Term
| the hardness is proportional to the bounce of the object |
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Definition
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Term
| the impression made is negligible, bc nothing actually penetrates the surface |
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Definition
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Term
| machine is small and portable |
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Definition
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Definition
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| shore scleroscope penetrator |
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Definition
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Definition
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Definition
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| based on the way hardness affects the natural resonant frequency of a piece of metal |
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| places minerals in a hardness range based on the ability of harder minerals to scratch softer ones |
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