EMAE 160 FINAL Questions - Lecture 4
(Material Properties, Powdered
Metallurgy, and Non-Traditional
Machining Methods) Q&A
10. 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-laser beam cutting or water jet cutting
12. What are the three basic steps in the conventional powdered metallurgy
process? - ANSWER-1. blending
2. compaction
3. sintering
13. Ductility vs. malleability? - ANSWER-ductile: stretch without damage, stretched
into wires
malleable: deform under compression, rolled or hammered into sheets
14. What is work hardening for metal that is ductile and malleable? - ANSWER-
strengthening of a metal by plastic deformation
15. Describe metal injection molding? (PM) - ANSWER-fine metal powder is mixed
with binder material to make "feedstock" which is then shaped and solidified using
injection molding
16. _______________fluid is used in ECM for metal removal. - ANSWER-conductive
fluid/electrolyte
17. _______________fluid is used in EDM for metal removal. - ANSWER-dielectric
fluid (deionized water, kerosene based oil)
1. What are the two systems used for measuring the hardness of heat-treated
steels? - ANSWER-1. brinell hardness no
2. rockwell c scale
Explain the difference between liquid-phase sintering and solid-phase sintering when
describing
the powdered metallurgy process. - ANSWER-liquid: needs additive in powder that
melts before matrix phase
solid: heat treatment of powder compacts at elevated temperatures
(Material Properties, Powdered
Metallurgy, and Non-Traditional
Machining Methods) Q&A
10. 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-laser beam cutting or water jet cutting
12. What are the three basic steps in the conventional powdered metallurgy
process? - ANSWER-1. blending
2. compaction
3. sintering
13. Ductility vs. malleability? - ANSWER-ductile: stretch without damage, stretched
into wires
malleable: deform under compression, rolled or hammered into sheets
14. What is work hardening for metal that is ductile and malleable? - ANSWER-
strengthening of a metal by plastic deformation
15. Describe metal injection molding? (PM) - ANSWER-fine metal powder is mixed
with binder material to make "feedstock" which is then shaped and solidified using
injection molding
16. _______________fluid is used in ECM for metal removal. - ANSWER-conductive
fluid/electrolyte
17. _______________fluid is used in EDM for metal removal. - ANSWER-dielectric
fluid (deionized water, kerosene based oil)
1. What are the two systems used for measuring the hardness of heat-treated
steels? - ANSWER-1. brinell hardness no
2. rockwell c scale
Explain the difference between liquid-phase sintering and solid-phase sintering when
describing
the powdered metallurgy process. - ANSWER-liquid: needs additive in powder that
melts before matrix phase
solid: heat treatment of powder compacts at elevated temperatures
