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Tungsten-nickel-iron alloy and high-strength steel diffusion welding method for intermediate layer prepared through material reduction

A tungsten-nickel-iron alloy and diffusion welding technology, which is applied in welding equipment, manufacturing tools, metal processing equipment, etc., can solve the problems of poor adaptability of the middle layer structure, easy formation of brittle intermetallic compounds, and large joint welding thermal stress, etc., to achieve relaxation The effects of welding thermal stress, improving structural adaptability, and ensuring strength

Active Publication Date: 2021-10-22
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] (1) The purpose of the present invention is to overcome the problems such as large joint welding thermal stress, easy formation of brittle intermetallic compounds at the interface, and poor adaptability of the intermediate layer structure in the current diffusion welding of tungsten-nickel-iron alloy and high-strength steel, and propose a material-subtractive preparation method. The diffusion welding method between tungsten-nickel-iron alloy and high-strength steel in the middle layer completely avoids the appearance of brittle intermetallic compounds in the entire joint, which can ensure the strength of the joint to the greatest extent and effectively alleviate the welding thermal stress

Method used

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  • Tungsten-nickel-iron alloy and high-strength steel diffusion welding method for intermediate layer prepared through material reduction
  • Tungsten-nickel-iron alloy and high-strength steel diffusion welding method for intermediate layer prepared through material reduction

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Embodiment 1

[0021] This embodiment is a welding method of tungsten-nickel-iron alloy and high-strength steel. The tungsten-nickel-iron alloy involved is 90WNiFe alloy, cut into Φ36×20mm 3 The high-strength steel involved is 60CrMnMo steel, cut into Φ36×20mm 3 of the cylinder.

[0022] The specific process of this embodiment includes the following steps:

[0023] Step 1: After polishing the surfaces of 90WNiFe alloy and 60CrMnMo high-strength steel with 150-mesh, 400-mesh, 600-mesh, 800-mesh, and 1000-mesh sandpaper in turn, use W0.5 diamond polishing paste for polishing to ensure that the surfaces to be welded are flat and free of oxidation membrane.

[0024] Step 2, put the polished 90WNiFe alloy and 60CrMnMo high-strength steel in alcohol for 15 minutes with ultrasonic cleaning; put the cleaned 90WNiFe alloy and 60CrMnMo high-strength steel into a vacuum drying box, set the drying temperature to 50°C and the drying time For 20min, dry for use.

[0025] Step 3, take an appropriate a...

Embodiment 2

[0031] This embodiment is a welding method of tungsten-nickel-iron alloy and high-strength steel. The tungsten-nickel-iron alloy involved is 93WNiFe alloy, cut into Φ36×20mm 3 The high-strength steel involved is 40Cr, cut into Φ36×20mm 3 of the cylinder.

[0032] The specific process of this embodiment includes the following steps:

[0033] Step 1. After polishing the surfaces of 93WNiFe alloy and 40Cr high-strength steel with 150-mesh, 400-mesh, 600-mesh, 800-mesh, and 1000-mesh sandpaper in turn, use W0.5 diamond polishing paste for polishing to ensure that the surfaces to be welded are flat and free of oxidation membrane.

[0034] Step 2, put the polished 93WNiFe alloy and 40Cr high-strength steel into alcohol and ultrasonically clean for 15 minutes. Put the cleaned 93WNiFe alloy and 40Cr high-strength steel into a vacuum drying oven, set the drying temperature to 50 °C and the drying time to 20 min, and dry for use.

[0035] Step 3, take an appropriate amount of NaOH,...

Embodiment 3

[0041] This embodiment is a welding method of tungsten-nickel-iron alloy and high-strength steel. The tungsten-nickel-iron alloy involved is 95WNiFe alloy, cut into Φ36×20mm 3 The high-strength steel involved is 42CrMoV, cut into Φ36×20mm 3 of the cylinder.

[0042] The specific process of this embodiment includes the following steps:

[0043] Step 1, polish the surfaces of 95WNiFe alloy and 42CrMoV high-strength steel with 150-mesh, 400-mesh, 600-mesh, 800-mesh, and 1000-mesh sandpaper in turn, and then use W0.5 diamond polishing paste for polishing to ensure that the surfaces to be welded are flat and free of oxidation membrane.

[0044] Step 2, put the polished 95WNiFe alloy and 42CrMoV high-strength steel in alcohol for 15 minutes with ultrasonic cleaning; put the cleaned 95WNiFe alloy and 42CrMoV high-strength steel into a vacuum drying box, set the drying temperature to 50°C and the drying time For 20min, dry for use.

[0045] Step 3, take an appropriate amount of N...

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Abstract

The invention discloses a tungsten-nickel-iron alloy and high-strength steel diffusion welding method for an intermediate layer prepared through material reduction, and belongs to the technical field of dissimilar metal material welding. According to the method, tungsten particle phases with a certain thickness on the surface of the tungsten-nickel-iron alloy are removed in situ by adopting an electrolytic erosion process, only NiFeW phases are left, and the porous NiFeW intermediate layer is prepared on the surface of a tungsten-nickel-iron alloy base metal in a manner of in-situ material reduction; and then, the tungsten-nickel-iron alloy is assembled with a high-strength steel base material to be subjected to vacuum diffusion welding, and finally a welding joint of a tungsten-nickel-iron alloy / (NiFeW solid solution and dispersed W particles) composite connecting layer / high-strength steel structure is formed. The method has the advantages that (1) the porous NiFeW intermediate layer prepared on the surface of the tungsten-nickel-iron alloy through electrolytic erosion in-situ material reduction is high in structural adaptability; (2) the welding joint completely avoids the appearance of interface intermetallic compounds; and (3) the linear expansion coefficient of the composite connecting layer of the NiFeW solid solution and the dispersed W particles is between that of the tungsten-nickel-iron alloy and that of the high-strength steel, so that the welding thermal stress is effectively relieved.

Description

technical field [0001] The invention belongs to the technical field of welding of dissimilar metal materials, and in particular provides a welding method suitable for the complex structure of tungsten-nickel-iron alloy / high-strength steel with high melting point difference, large thermal mismatch and high tendency to form brittle intermetallic compounds. Background technique [0002] Tungsten-nickel-iron alloy has a wide range of applications in advanced weapon manufacturing, nuclear industry, aerospace and other fields due to its high melting point, high strength, high density and radiation resistance. However, due to the poor room temperature toughness of tungsten-nickel-iron alloy, the further expansion of its application range is greatly limited. In view of the current situation, researchers have proposed diffusion welding of tungsten-nickel-iron alloy and high-strength steel, combining the high plastic toughness of high-strength steel and the high strength and density o...

Claims

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Application Information

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IPC IPC(8): B23K1/00B23K1/008B23K1/20B23K3/04B23K3/08C22C27/04C25F3/08
CPCB23K1/008B23K1/206B23K1/20B23K3/08B23K1/0008B23K3/04C25F3/08C22C27/04
Inventor 杨健陆超王玥张知航黄继华陈树海叶政
Owner UNIV OF SCI & TECH BEIJING
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