Nickel-based chromium-nickel-cobalt superalloy argon arc welding wire for additive manufacturing and preparation method thereof

Abstract

The invention discloses a chromium-nickel-cobalt superalloy argon arc welding wire for additive manufacturing and a preparation method thereof. The chromium-nickel-cobalt superalloy argon arc welding wire is characterized by comprising the following components in percentage by weight: 0.045-0.065% of C, 24.0-26.0% of Cr, 19.0-21.0% of Co, 1.2-1.4% of Al, 1.0-1.5% of Ti, 1.0-1.6% of Nb+Ta, less than or equal to 1.0% of Fe, less than or equal to 1% of Mn, less than or equal to 0.50% of Mo, less than or equal to 1% of Si, less than or equal to 0.5% of Cu, less than or equal to 0.020% of P, less than or equal to 0.010% of S, 0.0006-0.0060% of B and the balance Ni. The preparation method comprises the following steps: A, burdening, and forming of a steel ingot through pouring; B, steel ingot hot forging cogging; C, hot rolling annealing; D, acid pickling and coping; E, drawing step by step; and F, hydrogen annealing treatment. The performance of the chromium-nickel-cobalt superalloy argon arc welding wire ensures that the equipment operates safely and reliably under high-temperature and high-pressure corrosion working conditions.

Description

technical field [0001] The invention relates to an additive manufacturing technology, which is mainly applied to the additive manufacturing of the helium inlet side and the steam outlet side area (high temperature section of 650°C to 800°C) of the heat exchanger of the high temperature gas-cooled reactor steam generator. Specifically, it is a nickel-based chromium-nickel-cobalt superalloy argon arc welding wire for additive manufacturing and a preparation method thereof. The temperature of the material can be as high as about 850°C. Background technique [0002] The nuclear power steam generator is the heat exchange equipment that generates the steam required by the steam turbine, and it is also one of the most critical main equipment of the nuclear power plant. The steam generator is connected with the reactor pressure vessel, which not only directly affects the power and efficiency of the power plant, but also when exchanging heat, It also plays a role in blocking radioact...

AI Technical Summary

Problems solved by technology

[0005] Although the structure of the DC counter-flow channel heat exchanger is very good, it is almost impossible to realize the traditional manufacturing process. Therefore, people have proposed a technical solution to prepare a new heat exchanger structure by using additive manufacturing technology. Additive manufacturing (3D printing ) molding method, because the high-temperature resistant nickel-based alloy material is very expensive, in order to reduce the overall manufacturing cost, the entire heat exchanger is divided into three sections according to the temperature range, namely the high temperature section of 650℃~800℃, the high temperature section of 500℃~650℃ For the middle temperature section and the low temperature section below 500°C, different alloy compositions are used in different temperature sections, which can not only meet the requirements of service conditions, but also greatly reduce the manufacturing cost; because the composition of different alloys is very different, their performance is also very different. In order to avoid the performance discontinuity caused by the composition discontinuity, it is necessary to increase the transition metal zone between the two different alloys to smooth the performance change caused by the dissimilar metals. Therefore, a total of 5 kinds of argon arc welding wires for additive manufacturing are required. to apply to actual working conditions