| 摘要 |
<p>A method of post-solidification processing to minimize the content of extremely coarse grain-refining precipitates that may form during solidification in low-alloy and alloy high-strength steels containing approximately 0.09-0.17 % by weight C so as to provide improved toughness in a wrought and heat-treated product. The method entails cooling an as-cast steel at a reduced rate in a furnace held at a temperature in excess of the equilibrium solution temperature for AlN in austenite. The steel is maintained at this temperature for a sufficient amount of time to effect the dissolution of coarse AlN precipitates in the microstructure, and the so-treated steel is then cooled at any desired rate to room temperature or to a hot-rolling temperature.</p> |
