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8 Cards in this Set

  • Front
  • Back

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


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

(a) aluminum alloys

(b) brass

(c) copper alloys

(d) 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


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


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


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

(a) boronizing

(b) carbonitriding

(c) carburizing

(d) chromizing

(e) nitriding


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