EMAE 160 FINAL REVIEW CWRU -
MATERIAL PROPERTIES, POWDERED
METALLURGY, AND NON-
TRADITIONAL MACHINING METHODS
QUESTIONS WITH COMPLETE
ANSWERS
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.
What machining process is appropriate for creating a square blind hole in a piece of
steel? - ANSWER-Ram EDM
What machining process is appropriate for creating a narrow slot (0.015" wide) in a 2
inch thick plate of hardened tool steel? - ANSWER-Wire EDM, laser beam cutting,
water jet
What are the three basic steps in the conventional powdered metallurgy process? -
ANSWER-Blending, compacting, sintering
What is the difference between ductility and malleability? - ANSWER-Ductility-
stretch without damage. Malleability- The ability to be hit into sheets.
What is work hardening for metal that is ductile and malleable? - ANSWER-It is to
strengthen the metal by plastic deformation. This is mostly for ductile metals.
Describe metal injection molding. - ANSWER-Powdered metal put into dies then
corroded and sintered down in size.
MATERIAL PROPERTIES, POWDERED
METALLURGY, AND NON-
TRADITIONAL MACHINING METHODS
QUESTIONS WITH COMPLETE
ANSWERS
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.
What machining process is appropriate for creating a square blind hole in a piece of
steel? - ANSWER-Ram EDM
What machining process is appropriate for creating a narrow slot (0.015" wide) in a 2
inch thick plate of hardened tool steel? - ANSWER-Wire EDM, laser beam cutting,
water jet
What are the three basic steps in the conventional powdered metallurgy process? -
ANSWER-Blending, compacting, sintering
What is the difference between ductility and malleability? - ANSWER-Ductility-
stretch without damage. Malleability- The ability to be hit into sheets.
What is work hardening for metal that is ductile and malleable? - ANSWER-It is to
strengthen the metal by plastic deformation. This is mostly for ductile metals.
Describe metal injection molding. - ANSWER-Powdered metal put into dies then
corroded and sintered down in size.
