NiAl-Cr(Mo) biphase eutectic crystal intermetallic compound modified by W

An intermetallic compound and eutectic metal technology, which is applied in the field of W-modified NiAl-Cr(Mo) dual-phase eutectic intermetallic compounds, can solve the problems of little improvement in high temperature strength and inability to meet the requirements for use, and achieve good Comprehensive performance, improve room temperature plasticity, improve high temperature strength effect

Inactive Publication Date: 2008-03-26
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high-temperature strength of NiAl-Cr(Mo) dual-phase eutectic intermetallic compounds has not been greatly improved, and it still cannot meet the requirements of the new generation of gas turbine engines at 1150 °C. An effective approach to the comprehensive properties of NiAl intermetallic compounds

Method used

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  • NiAl-Cr(Mo) biphase eutectic crystal intermetallic compound modified by W
  • NiAl-Cr(Mo) biphase eutectic crystal intermetallic compound modified by W
  • NiAl-Cr(Mo) biphase eutectic crystal intermetallic compound modified by W

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1:Preparation of 33Ni-23Al-30Cr-4Mo-10W intermetallic compound

[0031] The ingredients are formulated according to the composition of 33Ni-23Al-30Cr-4Mo-10W (atomic percentage), and the purity of the raw materials is 99.999%.

[0032] Melting 33Ni-23Al-30Cr-4Mo-10W alloy ingots in a non-consumable vacuum electric arc furnace with a vacuum degree of 5×10 -3 Pa, smelting temperature 3500°C, smelting 6 times, the raw materials are smelted evenly.

[0033] The obtained intermetallic compound rod was kept at 1200° C. for 12 hours in a high-temperature heat treatment furnace, and then cooled to room temperature with the furnace.

[0034] A cylindrical sample with a diameter of 6mm and a height of 9mm and a square cylinder with a diameter of 6mm×6mm×30mm were cut from the heat-treated 33Ni-23Al-30Cr-4Mo-10W ingot by wire cutting method for mechanical performance testing.

[0035] Accurate to 10 with Model 1111 -4 The mass M of the sample is measured by an electron...

Embodiment 2

[0037] Example 2: Preparation of 33Ni-30Al-30Cr-4Mo-3W intermetallic compound

[0038] The ingredients are formulated according to the composition of 33Ni-30Al-30Cr-4Mo-3W (atomic percentage), and the purity of the raw materials is 99.999%.

[0039] Melting 33Ni-30Al-30Cr-4Mo-3W alloy ingots in a non-consumable vacuum electric arc furnace with a vacuum degree of 4×10 -3 Pa, smelting temperature 3700°C, smelting 4 times, the raw materials are smelted evenly.

[0040] The obtained intermetallic compound rod was kept at 1200° C. for 12 hours in a high-temperature heat treatment furnace, and then cooled to room temperature with the furnace.

[0041] The mechanical property testing conditions of 33Ni-30Al-30Cr-4Mo-3W intermetallic compound are the same as in Example 1, and its density is 7.02g / cm 3 See Figure 2. In the figure, the yield strength at 25°C is 1300MPa, and the compressive plasticity is greater than 15%; the yield strength at 800°C is 280MPa, and the compressive pla...

Embodiment 3

[0042] Example 3: Preparation of 33Ni-28Al-30Cr-4Mo-5W intermetallic compound

[0043] The ingredients are Ni-28Al-30Cr-4Mo-5W (atomic percentage), and the purity of the raw materials is 99.999%.

[0044] Melting 33Ni-28Al-30Cr-4Mo-5W alloy ingots in a non-consumable vacuum electric arc furnace with a vacuum degree of 3×10 -3 Pa, smelting temperature 3800°C, smelting 4 times, the raw materials are smelted evenly.

[0045] The obtained intermetallic compound rod was kept at 1200° C. for 12 hours in a high-temperature heat treatment furnace, and then cooled to room temperature with the furnace.

[0046] A cylinder sample with a diameter of 6 mm and a height of 9 mm and a square cylinder with a diameter of 6 mm × 6 mm × 30 mm were cut from the heat-treated 33Ni-28Al-30Cr-4Mo-5W ingot by wire cutting method for mechanical property testing.

[0047] The mechanical property testing conditions of 33Ni-28Al-30Cr-4Mo-5W intermetallic compound are the same as in Example 1, and its d...

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Abstract

The present invention discloses one kind of W modified two-phase eutectic intermetallic NiAl-Cr(Mo) compound comprising Ni in 33 at.%, Cr in 30 at.%, Mo in 4 at.%, W in 1-15 at.% and Al for the rest. By means of lowering Al content in the two-phase eutectic intermetallic NiAl-Cr(Mo) alloy, and adding W element to modify and form one pseudo binary eutectic phase with NiAl, the W modified two-phase eutectic intermetallic NiAl-Cr(Mo) compound has high room temperature toughness and plasticity and further raised high temperature strength. The W modified two-phase eutectic intermetallic NiAl-Cr(Mo) compound has yield strength at 1150 deg.c of 110-200 MPa and density of 6.8-7.8 g / cu cm.

Description

technical field [0001] The invention relates to a novel W-modified NiAl-Cr(Mo) dual-phase eutectic structure intermetallic compound, wherein NiAl phase, Cr(Mo) phase and W phase exist in the intermetallic compound. Background technique [0002] At present, in the industrial fields of power, petrochemical, transportation, especially aviation and aerospace, the metal structural materials used above 600 °C are usually nickel-based, iron-based and cobalt-based superalloys. These materials have a higher density (generally at 8.0g / cm 3 Above), the components and equipment made are heavy. In order to reduce structural weight, improve efficiency, and reduce energy consumption, it is necessary to develop new high-temperature alloys with low density and high specific strength to meet the needs of future development in related industrial fields. What is more urgent is that currently the superalloys represented by Ni base and Co base are close to the limit temperature of their use due ...

Claims

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Application Information

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IPC IPC(8): C22C30/00C22C1/02
Inventor 宫声凯汤林志张志刚刘先斌徐惠彬
Owner BEIHANG UNIV
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