The Influence Of Gas Elements And Non-metallic Inclusions Removal Process On Microstructure And Performance Of Ni-based Alloys

With the rapid development of aviation,aerospace,and electronic industrial technology, the requirements for Ni-based alloys are stricter,especially for thin wires.Not only chemical constitution and service performance are limited,but also inner and surface qualities are required.During the process of quality test of Ni-based alloy wires by one alloy company,it is found that non-metal inclusions are the main cause of crack and break in products.In this paper,the technology of argon bottom bubbling in tundish and foam ceramic filter are used in the production process of nickel-based alloys Cr20Ni35 and 4J43.The total amount of gas elements and non-metallic inclusions is stuyied by using analytical instruments, the microstructure and performance of alloy are also discussed.For the argon bottom bubbling technology,first use the similar principle to the production of water model in laboratory simulation model to determine the argon flow and other key parameters on the impact of technology,then identified the argon flow range of Cr20Ni35 and 4J43 alloy in argon bottom bubbling process.Industrial application results showed that:at the right flow of argon,the process can get a better control of element O and non-metallic inclusions in alloys.Compared with unbubbling,during the argon bottom bubbling technology of Cr20Ni35 alloy production,when the argon flow is 3L/min,the element O contents dopped 36%and 23%,the total amount of non-metallic inclusions reduced 24% and18%.During the argon bottom bubbling technology of 4J43 alloy,when the argon flow is 5L/min,the element O content dopped 51%,the total amount of non-metallic inclusions reduced 46%.The mechanical properties at room temperature of alloys are also improved after argon bottom bubbling technology.The application process results of foam ceramic filter for 4J43 alloy show that:filtering technology can remove inclusions effectively and improve mechanical properties at room temperature.Compared with non-filter,the total amount of non-metallic inclusions dopped 48%,the tensile strength of alloy increased 11MPa,and elongation increased 10%.With the results of these two kinds of processes,use the combination of argon bottom bubbling and filtering process to improve the production processes,then use the improved technology to produce 4J43 alloy.The industrial application results show that:the improved technology can remove gas elements and non-metallic inclusions stability and effectively and improve the alloy performance.Compared the original ESR process,the improved technology have the advantages of control easily,stability and low cost.From the perspective of industrial applications,the improved technology can not only removal the elements O and the non-metallic inclusions stablely but also save a lot of economic cost.The combination of argon bottom bubbling and filtering process is a more satisfactory process for the production of alloys.