CN-121992238-A - Corrosion-abrasion-resistant IN 625-based composite high-entropy alloy and preparation method thereof

Abstract

The invention discloses an IN 625-based composite high-entropy alloy resistant to corrosion and abrasion and a preparation method thereof, which belong to the technical field of the high-entropy alloy resistant to corrosion and abrasion, wherein CoCrFeNiMo high-entropy alloy components are introduced into an Inconel 625 matrix by adopting a wire-arc additive manufacturing process, and the IN 625-based composite high-entropy alloy resistant to corrosion and abrasion is prepared. According to the invention, through controlling the addition amount of CoCrFeNiMo high-entropy alloy components, the electrochemical uniformity of the alloy surface is optimized, and the formation of a more stable compact passivation film is promoted. By reducing component fluctuation between the matrix and the precipitated phase, the micro-couple corrosion driving force between phases can be obviously inhibited, so that the material shows more excellent thermodynamic stability and chemical protective performance in a chlorine-containing corrosive medium.

Inventors

• ZHONG WENDI
• XIAO CHEN
• PENG HUAIYU
• SU CHUANCHU
• LI XIANSHUN
• LEI YI
• WANG RUIQI
• DENG YUMING

Assignees

• 西南交通大学

Dates

Publication Date

20260508

Application Date

20260304

Claims (10)

1. 1. The preparation method of the IN 625-based composite high-entropy alloy resistant to corrosion and abrasion is characterized IN that a linear arc additive manufacturing process is adopted to introduce CoCrFeNiMo high-entropy alloy components into an Inconel 625 matrix, and the IN 625-based composite high-entropy alloy resistant to corrosion and abrasion is prepared.
2. 2. The method for preparing the IN 625-based composite high-entropy alloy resistant to corrosion and abrasion, which is characterized by comprising the following steps of installing an Inconel 625 welding wire and CoCrFeNiMo high-entropy alloy components IN a wire arc additive manufacturing system, setting welding parameters, introducing protective gas, introducing the CoCrFeNiMo high-entropy alloy components into a molten pool, forming a composite material component through a layer-by-layer build-up welding process, cooling the composite material component, and then carrying out post-treatment and machining to obtain the IN 625-based composite high-entropy alloy resistant to corrosion and abrasion.
3. 3. The method for preparing the corrosion-wear-resistant IN 625-based composite high-entropy alloy according to claim 2, wherein the total number of atoms IN the CoCrFeNiMo high-entropy alloy component is 25% -66.67% of the total number of atoms of the corrosion-wear-resistant IN 625-based composite high-entropy alloy.
4. 4. The method for preparing the corrosion and abrasion resistant IN 625-based composite high-entropy alloy according to claim 2, wherein the atomic percentages of elements IN the Inconel 625 welding wire are 25.23at% Cr, 2.85at% Fe, 64.1at% Ni, 5.84at% Mo and 1.98at% Nb.
5. 5. The method for preparing the IN 625-based composite high-entropy alloy with corrosion and wear resistance according to claim 2, wherein the CoCrFeNiMo high-entropy alloy component comprises 19.82at% of Co, 19.79at% of Cr, 21.58at% of Fe, 18.52at% of Ni and 20.29at% of Mo.
6. 6. The method for preparing the IN625 based composite high-entropy alloy with corrosion and abrasion resistance according to claim 2, wherein the welding parameters are that the welding current is 100-250A, the voltage is 15-30V, and the welding speed is 3-8mm/s.
7. 7. The method for preparing the IN 625-based composite high-entropy alloy with corrosion and abrasion resistance according to claim 2, wherein the shielding gas is argon, and the flow rate of the argon is 10-20L/min.
8. 8. The method for preparing the IN 625-based composite high-entropy alloy with corrosion and wear resistance according to claim 2, wherein the mode of introducing CoCrFeNiMo high-entropy alloy components into a molten pool is selected from a synchronous wire feeding mode or a preset alloy powder mode.
9. 9. The method for preparing the corrosion and wear resistant IN625 base composite high-entropy alloy according to claim 2, wherein the layer-by-layer build-up welding process comprises the following steps: s1, after pre-introducing protective gas, synchronously feeding the Inconel 625 welding wire and CoCrFeNiMo high-entropy alloy components, and starting first layer deposition; s2, naturally cooling in a protective gas atmosphere after the first deposition is finished, and starting to deposit the next layer when the interlayer temperature is reduced to 100-250 ℃; And repeating the steps S1 and S2 until all build-up welding forming is completed, and cooling to below 80 ℃ in a protective gas atmosphere after deposition is finished.
10. 10. An IN 625-based composite high-entropy alloy resistant to corrosive wear, prepared by the preparation method according to any one of claims 1 to 9, wherein the IN 625-based composite high-entropy alloy resistant to corrosive wear comprises a continuous network sigma phase induced by the CoCrFeNiMo high-entropy alloy components.

Description

Corrosion-abrasion-resistant IN 625-based composite high-entropy alloy and preparation method thereof Technical Field The invention belongs to the technical field of wear-resistant corrosion-resistant high-entropy alloy, and particularly relates to an IN 625-based composite high-entropy alloy with corrosion resistance and wear resistance and a preparation method thereof. Background Inconel 625 (IN 625) is an austenitic nickel-based superalloy that is solution strengthened by the addition of elements such as chromium, molybdenum, and niobium to nickel as a matrix. Because of excellent corrosion resistance in oxidation and reduction environments, good welding processability and high-temperature strength, the alloy is widely applied to extremely severe environments such as aerospace, ocean engineering, chemical equipment, nuclear industry and the like. The High-entropy alloy (High-Entropy Alloys, HEAs) is used as a novel metal material breaking through the traditional single principal component design concept, the solid solution structure is stabilized by five or more elements according to near-equiatomic ratio, and the High-entropy alloy is stable by virtue of the characteristic hysteresis diffusion, severe lattice distortion and cocktail effect, and has excellent thermal stability and toughness, and meanwhile, the High-entropy alloy has obvious potential in corrosion resistance and abrasion resistance under extremely severe environment, so that the field is in a key stage of crossing from basic theoretical exploration to High-performance metal-based modification and engineering application, and a brand-new design paradigm is provided for breaking through the traditional alloy performance bottleneck. The cocktail effect is that through scientific proportioning and synergistic effect of multiple main components, the alloy generates comprehensive synergistic enhancement effect exceeding that of a single component on the basis of retaining excellent characteristics of each element, and theoretical support is provided for realizing high hardness, high toughness and excellent corrosion and wear resistance of the material. For IN625 alloys, with the development of industrial technology, the relevant operating environment is becoming more complex, and the components tend to simultaneously withstand the combined action of the attack of the highly corrosive medium and the mechanical frictional movement, i.e. the corrosive wear. Although the conventional IN625 alloy has better corrosion resistance, the hardness is relatively low and the abrasion resistance is limited. Under the coupling action of corrosion and abrasion, the passivation film on the surface of the material is easily and repeatedly damaged by mechanical force, so that the corrosion rate is greatly increased, and serious material loss and equipment failure are caused. For the high-entropy alloy, coCrFeNiMo high-entropy alloy has excellent physical and chemical properties, but the prior art still faces the bottlenecks of high raw material cost, tissue embrittlement caused by sigma hard and brittle phase precipitation, difficult processing and forming of large-size complex components and the like, and meanwhile, when a simple high-entropy alloy system is used for coping with extreme corrosive wear working conditions, the self-repairing rate of a passivation film and the toughness of a matrix are difficult to balance. For example, the OCP of a single CoCrFeNiMo high-entropy alloy in a corrosive wear environment continuously decreases in the whole course (as shown in fig. 6), and it can be seen that the OCP of a CoCrFeNiMo high-entropy alloy in a corrosive wear environment continuously decreases in the whole course, which means that when a pure high-entropy alloy system is used for coping with extreme corrosive wear conditions, the balance between the self-repairing rate of a passivation film and the toughness of a substrate is often difficult to be considered, and the lack of research of deep fusion of the passivation film as a functional component with a traditional nickel-based superalloy currently causes the technical blank in the realization of "toughness-corrosion resistance-economy" collaborative optimization. Disclosure of Invention Aiming at the problems, the invention provides an IN 625-based composite high-entropy alloy with corrosion and abrasion resistance and a preparation method thereof. According to the invention, coCrFeNiMo high-entropy alloy components with specific proportions are introduced into an IN625 matrix (such as A1 and A2 series), and the special distribution rule of Mo, cr and other elements IN the high-entropy alloy under a multi-principal element environment is utilized, so that the solid solution strengthening effect of the matrix is enhanced, and more importantly, a composite passivation film with better protection is formed on the surface of the material. The design can effectively inhibit stress corrosion and abrasive wear ca