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Why are metals coated?
What is calorizing?
What is the difference between diffusion and ion implantation?
What is meant by the term mass finishing?
In addition to surface cleaning, what is the main function performed by shot peening?
Name some of the important chemical cleaning methods.
What are the basic types of contaminants that must be cleaned from metallic surfaces in
\r\nmanufacturing?
Mechanical surface treatments are often performed for reasons other than or in addition to cleaning.
\r\nWhat are the reasons?
What are some of the important reasons why manufactured parts must be cleaned?
\r\n
There are 12 correct answers in the following multiple choice questions (some questions have multiple
\r\nanswers that are correct). To attain a perfect score on the quiz, all correct answers must be given. Each
\r\ncorrect answer is worth 1 point. Each omitted answer or wrong answer reduces the score by 1 point, and
\r\neach additional answer beyond the correct number of answers reduces the score by 1 point. Percentage score
\r\non the quiz is based on the total number of correct answers.
\r\n27.1 Which of the following are the usual objectives of heat treatment (three best answers): (a) increase
\r\nhardness, (b) increase melting temperature, (c) increase recrystallization temperature, (d) reduce
\r\nbrittleness, (e) reduce density, and (f) relieve stresses?
\r\n27.2 Of the following quenching media, which one produces the most rapid cooling rate: (a) air, (b)
\r\nbrine, (c) oil, or (d) pure water?
\r\n27.3 On which one of the following metals is the treatment called austenitizing be performed: (a)
\r\naluminum alloys, (b) brass, (c) copper alloys, or (d) steel?
\r\n27.4 The treatment in which the brittleness of martensite is reduced is called which one of the following:
\r\n(a) aging, (b) annealing, (c) austenitizing, (d) normalizing, (e) quenching, or (f) tempering?
\r\n27.5 The Jominy end-quench test is designed to indicate which one of the following: (a) cooling rate, (b)
\r\nductility, (c) hardenability, (d) hardness, or (e) strength?
\r\n27.6 In precipitation hardening, the hardening and strengthening of the metal occurs in which one of the
\r\nfollowing steps: (a) aging, (b) quenching, or (c) solution treatment?
\r\n27.7 Which one of the following surface-hardening treatments is the most common: (a) boronizing, (b)
\r\ncarbonitriding, (c) carburizing, (d) chromizing, or (e) nitriding?
\r\n27.8 Which of the following are selective surface-hardening methods (three correct answers): (a)
\r\naustenitizing, (b) electron beam heating, (c) fluidized bed furnaces, (d) induction heating, (e) laser
\r\nbeam heating, and (f) vacuum furnaces?
How does austenite differ from ferrite?
\r\n
List three properties of ferrite at room temperature.
\r\n
Identify the selective surface-hardening methods.
\r\n
How does carburizing work?
Define precipitation hardening.
Indicate how the hardenability alloying elements in steel affect the TTT curve.
\r\n
Name some of the elements that have the greatest effect on the hardenability of steel.
Define hardenability.
What function is served by tempering?
\r\n
What information is conveyed by the TTT curve?
What is the mechanism by which carbon strengthens steel during heat treatment?
What is the most important heat treatment for hardening steels?
\r\n
Identify the important reasons why metals are annealed.
Why are metals heat treated?
In a chemical blanking operation, stock thickness of the aluminum sheet is 0.015 in. The pattern to
\r\nbe cut out of the sheet is a hole pattern, consisting of a matrix of 0.100 in diameter holes. If
\r\nphotochemical machining is used to cut these holes, and contact printing is used to make the resist
\r\n(maskant) pattern, determine the diameter of the holes that should be used in the pattern.
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