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8 Cards in this Set

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Which of the following are the usual objectives of heat treatment? (3)




(a) increase hardness


(b) increase melting temperature


(c) increase re-crystallization temperature


(d) reduce brittleness


(e) reduce density


(f) relieve stresses

increase hardness, reduce brittleness. relieve stresses

Of the following quenching media, which one produces the most rapid cooling rate?




(a) air


(b) brine


(c) oil


(d) pure water

brine

On which one of the following metals is the treatment called austenitizing be performed?




(a) aluminum alloys


(b) brass


(c) copper alloys


(d) steel

steel

The treatment in which the brittleness of martensite is reduced is called which one of the following?




(a) aging


(b) annealing


(c) austenitizing


(d) normalizing


(e) quenching


(f) tempering

tempering

The Jominy end-quench test is designed to indicate which one of the following?




(a) cooling rate


(b) ductility


(c) hardenability


(d) hardness


(e) stength

hardenability

In precipitation hardening, the hardening and strengthening of the metal occurs in which one of the following steps?




(a) aging


(b) quenching


(c) solution treatment

aging

Which one of the following surface-hardening treatments is the most common?




(a) boronizing


(b) carbonitriding


(c) carburizing


(d) chromizing


(e) nitriding

carburizing

Which of the following are selective surface hardening methods? (3)




(a) austenitizing


(b) electron beam heating


(c) fluidized bed furnaces


(d) induction heating


(e) laser beam heating


(f) vaccum furnaces

electron beam heating, induction heating, laser beam heating