The cooling rate for normalizing is faster than that of annealing. A: 正确 B: 错误

Annealing and normalizing present a significant difference on the ductility of low carbon steels.​

中国大学MOOC: Annealing and normalizing present a significant difference on the ductility of low carbon steels.

Annealing and normalizing present a significant difference on the ductility of low carbon steels. A: 正确 B: 错误

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

The normalizing temperature of subeutectoid steel is generally ( ). A: Acl+30-50°C B: Accm+30-50°C C: Ac3+30-50°C D: Ar3+30-50℃

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

For<br/>1080 steel, normalizing is a heat treatment obtained by austenitizing<br/>and ____ cooling. A: air B: furnace C: water D: oil

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

In the as-quenched state, martensite is very hard and so brittle that a heat treatment known as_________must be accomplished sequently. A: normalizing B: annealing C: tempering D: austempering