The heat treatment of spring steel is treated by ( ). A: quenching and low tempering B: quenching and tempering C: quenching and middle tempering D: quenching and high tempering

The heat treatment process after carburization is () A: Quenching + high temperature tempering B: Quenching + medium temperature tempering C: Quenching + low temperature tempering D: normalizing

The common heat treatment on steels such as 65Mn and 60Si2Mn is . A: quenching + low temperature tempering B: quenching + medium temperature tempering C: quenching + high temperature tempering D: normalizing

For tool steel, the heat treatment is usually: () A: spheroidizing followed by quenching and low temperature tempering B: carburizing followed by quenching and low temperature tempering C: Quenching and high temperature tempering D: normalizing

Quenching<br/>is the heat treatment by which austenite transforms to ____. A: bainite B: pearlite C: martensite D: ferrite

During heat treatment of steel, austenite transforms into martensite by A: annealing B: austenitizing C: quenching D: normalizing

To improve the machinability of low carbon steel, the heat treatment process usually used is ( ) . A: quenching B: tempering C: annealing D: normalizing

In which heat treatment process, the specimen should be cooled in water or oil A: Tempering B: Annealing C: Quenching D: Case hardening

____<br/>is the isothermal heat treatment by which austenite transforms to<br/>bainite. A: Isothermal<br/>annealing B: Quenching C: Austempering D: Marquenching

The cutting force of 45 steel after normalizing is ( ) that of 45 steel after quenching and tempering. A: smaller than B: larger than C: equal to D: uncertain