Nickel-molybdenum intermediate alloy preparation method for smelting TA10 cast ingot

Abstract

The invention provides a nickel-molybdenum intermediate alloy preparation method for smelting a TA10 cast ingot. The nickel-molybdenum intermediate alloy preparation method comprises the following steps: respectively turning a pure nickel rod and a molybdenum rod into scrap materials, and heating and drying the scrap materials; adding dried master batch nickel scraps into a crucible of a medium-frequency induction furnace; meanwhile, adding molybdenum scraps into a secondary charging hopper in the medium-frequency induction furnace; vacuumizing the medium-frequency induction furnace to 0.6Pa-0.1Pa and starting to heat and smelt; raising the temperature to 1800-1900 DEG C and keeping the heat for 15-20 minutes; observing that when the smelting rate of the master batch nickel scraps is more than 45%, starting to add the molybdenum scraps; inflating argon to carry out gas protection; continually raising the temperature to guarantee that the temperature reaches 1900 DEG C and keeping the temperature for 20-30 minutes to sufficiently float impurities in smelting liquid up to the surface of a smelting tank; and finally, pouring the smelting liquid into a fixed die and cooling to the room temperature to obtain the product. According to the nickel-molybdenum intermediate alloy preparation method, pure nickel and pure molybdenum are directly prepared into an intermediate alloy; the smelting point of the nickel-molybdenum alloy is reduced and various disadvantages of a traditional manner of adding the intermediate alloy in the process of smelting the TA10 cast ingot are made up.

Description

technical field [0001] The invention belongs to the technical field of master alloys, and in particular relates to a method for preparing a nickel-molybdenum master alloy for melting TA10 ingots. Background technique [0002] As an important additive in the metallurgical industry, the master alloy is used for smelting alloys with very different melting points. The master alloy for pre-preparation should have a lower melting point than pure elements to ensure that the added elements will melt. When traditionally smelting TA10 ingots, Ti-32Mo, pure nickel strips or nickel shavings are generally added to balance the elements. Throughout the entire adding process, there are several disadvantages: 1. Adding pure metal elements will inevitably lead to segregation. Adding nickel strips or nickel shavings, the density of nickel is high, and its fluidity cannot be guaranteed, so it will cause local or microscopic segregation , has strict requirements on the artificial fabric process...

AI Technical Summary

Problems solved by technology

Throughout the entire adding process, there are several disadvantages: 1. Adding pure metal elements will inevitably lead to segregation. Adding nickel strips or nickel shavings, the density of nickel is high, and its fluidity cannot be guaranteed, so it will cause local or microscopic segregation , has strict requirements on the artificial fabric process; 2. Ti-32Mo master alloy is generally prepared by vacuum consumable furnace. Due to the constant temperature rise of the consumable furnace, Mo itself has a high melting point and high density, which is very different from the melting point and density of sponge titanium. Therefore, in the preparation process, the phase solubility is very poor, and the degree of segregation is conceivable, and because of its high Mo content, the subsequent addition of TA10 master alloy is small, so even if the cloth is controlled evenly, it cannot be avoided. Microsegregation

The above method is very difficult in the cloth process. Since it needs to be added twice to meet the requirements of the alloy composition, it puts forward higher requirements for the operator's sense of responsibility and man-machine efficiency. Therefore, it is necessary to improve