Preparation method of yttrium-based heavy-rare-earth copper-nickel alloy

A rare earth intermediate alloy and rare earth copper technology, which is applied in the field of high corrosion resistance CuNi alloys to achieve the effect of improving grain size, excellent corrosion resistance and high stability

Active Publication Date: 2018-11-27
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is no relevant patent report on using heavy rare earth Y to improve the corrosion performance of cupronickel alloys

Method used

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  • Preparation method of yttrium-based heavy-rare-earth copper-nickel alloy
  • Preparation method of yttrium-based heavy-rare-earth copper-nickel alloy
  • Preparation method of yttrium-based heavy-rare-earth copper-nickel alloy

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Experimental program
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Effect test

Embodiment 1

[0029] A high corrosion-resistant copper-nickel alloy, its specific chemical composition, by mass percentage Ni: 10.48%, Fe: 1.61%, Mn: 0.99%, P: 0.0054%, S: 0.0047%, C: 0.0074%, Y: 0.021 %, the balance is Cu ingredients. Among them, Yttrium-iron alloy is used as raw material for Yttrium-iron alloy; Yttrium-iron alloy (according to mass percentage) Y should be controlled at 60% to 70%; Y accounts for 65%, Fe accounts for 35%; the performance of the alloy is the best.

[0030] The preparation process is as follows:

[0031](1) Melting and casting is carried out according to the composition in Table 1. The melting is carried out in an intermediate frequency induction furnace, and nitrogen protection is used throughout the casting. The cast slab is heated to 950°C for 1 hour, and hot rolled on a two-roller hot rolling mill. The hot rolling start temperature is 930°C, the final rolling temperature is 780°C, and the deformation is 55%. After the hot rolling is completed, it is wat...

Embodiment 2

[0037] The difference with Example 1 is that by mass percentage Ni: 10.09%, Fe: 1.64%, Mn: 0.89%, P: 0.0074%, S: 0.0057%, C: 0.0064%, Y: 0.008%, the balance Ingredients for Cu.

Embodiment 3

[0039] The difference with Example 1 is that by mass percentage Ni: 9.95%, Fe: 1.66%, Mn: 0.82%, P: 0.0054%, S: 0.0052%, C: 0.0074%, Y: 0.017%, the balance Ingredients for Cu.

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Abstract

The invention relates to the field of copper-nickel (CuNi) alloy corrosion resistance improvement using rare-earth modification and grain boundary engineering, in particular to a preparation method ofyttrium-based heavy-rare-earth copper-nickel alloy. The yttrium-based heavy-rare-earth copper-nickel alloy comprises, by mass percentage, 9-12% of Ni, 1.0-2.0% of Fe, 0.5-1.5% of Mn, less than 0.01%of S, less than 0.01% of P, less than 0.01% of C, 50-300ppm of Y, less than 0.1% of other impurities and the balance copper. The alloy is prepared by smelting the raw materials into casting blanks under vacuum gas protection and subjecting the casting blanks to forging, hot rolling, primary cold rolling, intermediate annealing, secondary cold rolling and finished-product annealing. The high-corrosion-resistant CuNi alloy structurally comprises an alpha-Cu matrix and yttrium-based rare-earth compound inclusion, the grain size (not considering twin crystals) of the matrix is 40-60 micrometers, the low-energy coincidence site lattice grain boundary proportion of the matrix is larger than 75%, and the ratio of maximum free grain boundary length to free grain boundary total length is smaller than 0.3. The CuNi alloy is low in preparation cost, applicable to board and band products, excellent in corrosion resistance and especially applicable to service environments high in seawater corrosionresistance requirements, and the preparation method of the CuNi alloy is simple in process and easy to operate.

Description

technical field [0001] The invention relates to the field of a high-corrosion-resistant CuNi alloy, specifically through the addition of yttrium-based heavy rare earth and process design, and the optimization of grain boundary characteristics to improve its corrosion resistance. Background technique [0002] Copper-nickel alloys (B10, B30, etc.) are copper-based alloys with nickel as the main additive element. They are widely used in marine engineering equipment due to their excellent electrical conductivity, thermal conductivity, good processing performance and excellent corrosion resistance. , power plant equipment and shipbuilding equipment. In recent years, many researchers have carried out a lot of work to improve the corrosion resistance of copper-nickel alloys. In 1952, Bailey et al first proposed that the addition of iron (Fe) and manganese (Mn) on the basis of copper-nickel alloys could significantly improve the corrosion resistance of white copper alloys. Thereby...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C9/06C22F1/08C22C1/03
CPCC22C1/03C22C9/06C22F1/08
Inventor 汪志刚张迎晖宋春梅汪航杨斌
Owner JIANGXI UNIV OF SCI & TECH
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