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Cr-V-Co-Ni alloy and preparation method thereof

A cr-v-co-ni, alloy technology, applied in the field of Cr-V-Co-Ni alloy and its preparation, can solve the problems of poor thermal stability, low solution temperature, etc., and achieve the effect of good hot working and cold working performance

Active Publication Date: 2020-08-25
CENT FOR HIGH PRESSURE SCI & TECH ADVANCED RES +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First, compared with nickel-based superalloys, L1 in these high-entropy alloys 2 The solid solution temperatures of the phases are lower; secondly, these L1 2 The thermal stability of the phase is poor, with the increase of temperature, accompanied by L2 1 Phase, Ni 2 AlTi, B2, the formation of Cu-rich fcc; third, the addition of Ti to the high-entropy alloy, Al elements form L1 2 The lattice mismatch between the phase and the FCC matrix phase is small, and as a result, the weak elastic interaction between the dislocations and the second phase during deformation can only provide limited coherent strengthening effect
More importantly, due to thermal effects, many strengthening and toughening mechanisms that dominate at room temperature and low temperature are no longer applicable at high temperature

Method used

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Experimental program
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preparation example Construction

[0030] The preparation method of above-mentioned Cr-V-Co-Ni alloy comprises the following steps:

[0031] Step A, using bulk or granular single-phase V, Cr, Co and Ni pure metals as raw materials, according to Cr 0.25 V 0.75 CoNi, Cr 0.75 V0 .25 CoNi or Cr 0.5 V 0.5 Nominal ingredients of CoNi were dosed and mixed homogeneously. The purity of V, Cr, Co and Ni is not less than 99.9%.

[0032]During specific implementation, the diameter of the furnace body of the magnetic levitation melting furnace used in this step is 115mm (other diameters are also possible). After complete melting, the melt is stirred by the electromagnetic field and is in a suspended stirring state, which ensures the uniform distribution of the alloy components in space. In addition, due to the electromagnetic stir, the melt is also subjected to centrifugal force, which further drives away the inclusions with lower density. To the surface of the ingot, after the subsequent peeling treatment, the poten...

Embodiment 1

[0039] Example 1: The nominal composition of the alloy is Cr 0.5 V 0.5 CoNi, the alloy ingot size is about ɸ115 x 110mm when it is smelted into ingot by electromagnetic levitation melting and stratification technology 3 , The ingot is annealed at 1100°C-1150°C for 1 hour and then hot forged into a 10mm thick slab, and the slab is 85% cold rolled into a 1.5mm thick sheet.

[0040] As shown in Fig. 2(a) and Fig. 2(b), the annealed alloy sheet has fully recrystallized ultrafine grains with randomly oriented grains. A thin plate with a thickness of 1.5mm is annealed at 775°C for 1 hour to obtain ultra-fine-grained Cr with an average grain size of 576 ± 282nm 0.5 V 0.5 Alloy sheets of CoNi.

[0041] Cr 0.5 V 0.5 The mechanical properties of CoNi alloy samples annealed at 775°C for 1h in the temperature range of 77-1273K are shown in the table below.

[0042]

[0043] As shown in Fig. 1(a), the size of the prepared alloy ingot is about ɸ115 x 110mm 3 , much larger than th...

Embodiment 2

[0054] Example 2: The nominal composition of the alloy is Cr 0.25 V 0.75 CoNi, the alloy ingot size is about ɸ115 x 110mm when it is smelted into ingot by electromagnetic levitation melting and stratification technology 3 , The ingot was annealed at 1150°C for 1 hour and then hot forged into a 10mm thick slab, and the slab was 85% cold rolled into a 1.5mm thick sheet.

[0055] Cr 0.25 V 0.75 The mechanical properties of CoNi alloy samples annealed at 775°C for 1h in the temperature range of 77-1273K are shown in the table below.

[0056]

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Abstract

The invention discloses a Cr-V-Co-Ni alloy, and belongs to the technical field of alloy materials. The component of the Cr-V-Co-Ni alloy is Cr0.5V0.5CoNi, Cr0.25V0.75CoNi or Cr0.75V0.25CoNi. The Cr-V-Co-Ni alloy has a completely recrystallized ultrafine-grained gamma and sigma dual-phase structure, and a sigma phase precipitates in a face-centered cubic matrix and presents binary size distribution. The invention also discloses a preparation method of the Cr-V-Co-Ni alloy. The Cr-V-Co-Ni alloy and the preparation method have the beneficial technical effects that the Cr-V-Co-Ni alloy has a dualphase of gamma and sigma; after annealing, the dense sigma phase precipitates in the face-centered cubic matrix and presents the binary size distribution from tens of nanometers to microns, so that dispersion strengthening is formed; at a low temperature and a high temperature (especially 77k, 573k and 873k), the performance is far superior to the performance of other high temperature alloys, suchas nickel-based superalloys, face-centered cubic intermetallic compounds and titanium alloys; and the Cr-V-Co-Ni alloy has good hot working and cold working properties.

Description

technical field [0001] The invention belongs to the technical field of alloy materials, and in particular relates to a Cr-V-Co-Ni alloy and a preparation method thereof. Background technique [0002] Since the design strategy of high-entropy alloys was proposed by Cantor and Yeh et al. in 2004, due to its broad compositional design range and excellent material properties, it has attracted extensive research by material scientists. Initially, this new type of alloy was defined as being composed of at least five equiatomic ratios or close to equiatomic ratios (each element composition: 5-35 at%) elements. [0003] According to the classical thermodynamic formula G=H-TS (G-Gibbs free energy, H-enthalpy, S-entropy), the alloy phase with higher entropy has lower Gibbs free energy; further, by the formula S =-R∑x i ln(x i ) It can be seen that the closer the element content of the alloy is, the greater the entropy is, where x i is the content of the i-th element, and R is the ...

Claims

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Application Information

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IPC IPC(8): C22C30/00C22C1/02C22F1/10
CPCC22C1/02C22C30/00C22F1/10
Inventor 缑慧阳王玉辉陈真
Owner CENT FOR HIGH PRESSURE SCI & TECH ADVANCED RES