2results about How to "Reduce micro segregation" patented technology

This invention discloses a production process for SUP13Cr stainless steel bars, relating to the field of metal forging technology. The process includes the following steps: electric furnace, AOD (Advanced Oxidation Discharge), LF (Frost-Reduction), VD (Vacuum-Deposition), stacking cooling, grinding, forging, and annealing. The forging process includes a single upsetting and drawing operation, followed by reheating at 1140℃±10℃ for 2-4 hours, a second drawing and rounding operation after removal from the furnace, and finally annealing at 650±10℃ for 30 hours. This invention reduces the tendency for δ-ferrite formation by controlling the nitrogen content of the SUP13Cr ingot while ensuring corrosion resistance. Simultaneously, it employs a small ingot shape with large deformation during forging, ensuring reduced microscopic segregation of Cr, Mo, and other elements while increasing the forging deformation, effectively breaking down the original cast dendritic structure and reducing and refining high-temperature ferrite.

The application provides a high-casting-performance beryllium aluminum alloy and a preparation method thereof, and belongs to the technical field of alloy materials.The preparation method comprises the following steps: preparing materials according to the weight percentages of Be ingots, Al ingots, Ag ingots, Co sheets, Si and La metals; placing the Ag ingots, the Co sheets, the Si and the La metals at the bottom of a crucible, then sequentially placing the Al ingots and the beryllium ingots into the crucible, refining, and obtaining a melt; uniformly stirring the melt, then gradually cooling the melt to a pouring temperature, then pouring the melt into a prefabricated ceramic mold shell, and standing for 3-5 minutes in a furnace and cooling outside the furnace.The beryllium aluminum alloy has a uniform and dense structure, good fluidity, high casting performance, and is easy to be cast into a shape, and has fewer casting defects.