ch14 - Chapter 14 Synthesis Fabrication and Processing of...

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Chapter 14 Synthesis, Fabrication, and Processing of Materials Concept Check 14.1 Question: (a) Cite two advantages of powder metallurgy over casting. (b) Cite two disadvantages. Answer: (a) Advantages of powder metallurgy over casting are as follows: 1) It is used for alloys having high melting temperatures. 2) Better dimensional tolerances result. 3) Porosity may be introduced, the degree of which may be controlled (which is desirable in some applications such as self-lubricating bearings). (b) The disadvantages of powder metallurgy over casting are as follows: 1) Production of the powder is expensive. 2) Heat treatment after compaction is necessary.
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Concept Check 14.2 Question: What are the principal differences between welding, brazing, and soldering? You may need to consult another reference. Answer: For welding, there is melting of the pieces to be joined in the vicinity of the bond; a filler material may or may not be used. For brazing, a filler material is used which has a melting temperature in excess of about 425 ° C (800 ° F); the filler material is melted, whereas the pieces to be joined are not melted. For soldering, a filler material is used which has a melting temperature less than about 425 ° C (800 ° F); the filler material is melted, whereas the pieces to be joined are not.
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Concept Check 14.3 Question: Name the three factors that influence the degree to which martensite is formed throughout the cross section of a steel specimen. For each, tell how the extent of martensite formation may be increased. Answer:
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ch14 - Chapter 14 Synthesis Fabrication and Processing of...

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