EMAE 160 Final Review CWRU -
Material Properties, Powdered
Metallurgy, and Non-Traditional
Machining Methods Complete Answers
Describe metal injection molding. - ANSWER-Powdered metal put into dies then
corroded and sintered down in size.
What kind of fluid is used in ECM for metal removal? - ANSWER-Conductive
fluid/electrolyte
What kind of fluid is used in EDM for metal removal? - ANSWER-Dielectric fluid
(deionized water, oil)
What are two systems used for measuring the hardness of heat-treated steels? -
ANSWER-Rockwell C-scale, Brinell
Explain the difference between liquid-phase sintering and solid-phase sintering when
describing the powdered metallurgy process. - ANSWER-Solid-phase: Below the
melting temperature. Liquid-phase: Solid grains with a wetting liquid.
Of the following processes, which would provide the highest material rate?
a) Wire EDM
b) Ultrasonic machining
c) Plasma arc cutting - ANSWER-c) plasma arc cutting
What is a property that allows metals to be permanently deformed beyond yield
without failure by rupture or splitting? - ANSWER-Plasticity
Name the three types of stress to which materials are subjected. - ANSWER-Shear,
tensile, compressive
What is ultrasonic machining and can it be used for both metallic and non-metallic
materials? - ANSWER-Yes. It uses vibrations and abrasive fluid.
Are applications of electron beam machining limited to metallic materials. Why or
why not? - ANSWER-No. The heat developed can melt through ceramics and many
other materials.
What type of indenter does a Rockwell hardness tester (C scale) use to measure the
hardness of heat treated high-carbon steel? - ANSWER-120° diamond cone
In terms of the powdered metallurgy process, what is impregnation? - ANSWER-
Using a lower melting temperature metal to seal cracks during sintering.
Material Properties, Powdered
Metallurgy, and Non-Traditional
Machining Methods Complete Answers
Describe metal injection molding. - ANSWER-Powdered metal put into dies then
corroded and sintered down in size.
What kind of fluid is used in ECM for metal removal? - ANSWER-Conductive
fluid/electrolyte
What kind of fluid is used in EDM for metal removal? - ANSWER-Dielectric fluid
(deionized water, oil)
What are two systems used for measuring the hardness of heat-treated steels? -
ANSWER-Rockwell C-scale, Brinell
Explain the difference between liquid-phase sintering and solid-phase sintering when
describing the powdered metallurgy process. - ANSWER-Solid-phase: Below the
melting temperature. Liquid-phase: Solid grains with a wetting liquid.
Of the following processes, which would provide the highest material rate?
a) Wire EDM
b) Ultrasonic machining
c) Plasma arc cutting - ANSWER-c) plasma arc cutting
What is a property that allows metals to be permanently deformed beyond yield
without failure by rupture or splitting? - ANSWER-Plasticity
Name the three types of stress to which materials are subjected. - ANSWER-Shear,
tensile, compressive
What is ultrasonic machining and can it be used for both metallic and non-metallic
materials? - ANSWER-Yes. It uses vibrations and abrasive fluid.
Are applications of electron beam machining limited to metallic materials. Why or
why not? - ANSWER-No. The heat developed can melt through ceramics and many
other materials.
What type of indenter does a Rockwell hardness tester (C scale) use to measure the
hardness of heat treated high-carbon steel? - ANSWER-120° diamond cone
In terms of the powdered metallurgy process, what is impregnation? - ANSWER-
Using a lower melting temperature metal to seal cracks during sintering.
