| 摘要 |
A process for the annealing of hypoeutectoid steels wherein a steel is rapidly heated e.g. by electrical resistance means, to a temperature above the upper tranformation temperature of the steel to convert the steel to austenite and carbides, followed by cooling of the steel. The rate of heating of the steel is such as to cause dissolution of most of the carbides in the austenite thus formed, thereby leaving small particles of undissolved carbide in an amount sufficient to serve as nuclei for the precipitation of upper transformation products on cooling. Steels processed in accordance with the process of this invention are characterized by improved ductility and toughness as well as good machinability characteristics. <IMAGE> |
