A method of instantaneous liquid phase diffusion bonding for reliable joints of rafm steel

A diffusion connection, instantaneous liquid phase technology, applied in welding/welding/cutting items, welding equipment, manufacturing tools, etc., can solve the problems of large residual stress of joints, workpiece deformation, and high surface roughness of the workpiece connection surface, and achieve the connection time. Short, small deformation of workpiece, low pressure effect

Active Publication Date: 2022-04-29
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the pressure required to connect workpieces using solid phase diffusion bonding technology is very high, resulting in deformation of the workpieces, large residual stress in the joints, and solid phase diffusion bonding has high requirements for the surface roughness of the workpiece connection surface.

Method used

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  • A method of instantaneous liquid phase diffusion bonding for reliable joints of rafm steel
  • A method of instantaneous liquid phase diffusion bonding for reliable joints of rafm steel
  • A method of instantaneous liquid phase diffusion bonding for reliable joints of rafm steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Step 1: Cut RAFM steel into The cylinder, and then use a grinder to grind the end face of the cylinder flat and fine.

[0022] Step 2: Cut the Fe-Si-B alloy foil into For the disc, use sandpaper to polish both sides of the foil to 1500#. Step 3: Before connecting, ultrasonically clean the sample and alloy foil in acetone for 20 minutes, dry them, and then ultrasonically clean them in alcohol for 30 minutes, and dry them. Then the surface of the sample was washed with a pickling solution (volume percentage 20% HNO 3 +5%HF+75%H 2 O) wash 3min.

[0023] Step 4: sandwich the Fe-Si-B alloy foil between the surfaces to be connected of two RAFM steel samples. Place the assembled sample in a vacuum furnace and draw a vacuum. When the vacuum reaches 5×10 -3 Start heating at Pa, raise the temperature to 850°C at a heating rate of 5°C / min, hold for 30 minutes, then raise the temperature to 1215°C at a heating rate of 5°C / min, apply a pressure of 1MPa and hold for 3 minute...

Embodiment 2

[0028] Step 1: Cut RAFM steel into The cylinder, and then use a grinder to grind the end face of the cylinder flat and fine.

[0029] Step 2: Cut the Fe-Si-B alloy foil into For the disc, use sandpaper to polish both sides of the foil to 1500#. Step 3: Before connecting, ultrasonically clean the sample and alloy foil in acetone for 20 minutes, dry them, and then ultrasonically clean them in alcohol for 30 minutes, and dry them. Then the surface of the sample was washed with pickling solution (20% HNO 3 +5%HF+75%H 2 O) wash 5min. Step 4: sandwich the Fe-Si-B alloy foil between the surfaces to be connected of two RAFM steel samples. Place the assembled sample in a vacuum furnace and draw a vacuum. When the vacuum reaches 5×10 -3 Start heating at Pa, raise the temperature to 900°C at a heating rate of 10°C / min, keep it for 20 minutes, then raise the temperature to 1200°C at a heating rate of 10°C / min, apply a pressure of 0.8MPa and keep it for 30 minutes, then cool to ro...

Embodiment 3

[0034] Step 1: Cut RAFM steel into The cylinder, and then use a grinder to grind the end face of the cylinder flat and fine.

[0035] Step 2: Cut the Fe-Si-B alloy foil into For the disc, use sandpaper to polish both sides of the foil to 1500#. Step 3: Before connecting, ultrasonically clean the sample and amorphous foil in acetone for 30 minutes, dry them, and then ultrasonically clean them in alcohol for 20 minutes, and dry them. Then the surface of the sample was washed with pickling solution (20% HNO 3 +5%HF+75%H 2 O) wash 3min. Step 4: sandwich the Fe-Si-B alloy foil between the surfaces to be connected of two RAFM steel samples. Place the assembled sample in a vacuum furnace and draw a vacuum. When the vacuum reaches 5×10 -3 Start heating at Pa, raise the temperature to 850°C at a heating rate of 5°C / min, keep it for 30 minutes, then raise the temperature to 1200°C at a heating rate of 5°C / min, apply a pressure of 0.2MPa and keep it for 60 minutes, then cool to ...

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Abstract

The invention discloses a method for obtaining instantaneous liquid-phase diffusion connection of reliable joints of RAFM steel, using iron-based alloy foil Fe-Si-B to perform instantaneous liquid-phase diffusion connection of RAFM steel samples, with a temperature rise of 5-20°C / min Raise the temperature to 800‑900°C, keep it warm for 20‑40min, then raise the temperature to 1185‑1215°C at a rate of 5‑20°C / min, apply a pressure of 0.2‑2MPa in the direction perpendicular to the surface to be connected, and keep it warm for 1‑ 60min, and finally lowered to room temperature 20-25°C at a cooling rate of 5-30°C / min. The invention utilizes the middle layer of the alloy foil and designs a thermal cycle process for instantaneous liquid phase diffusion connection, thereby obtaining a reliable joint of RAFM steel with uniform structure and good mechanical properties.

Description

technical field [0001] The invention belongs to a metal material welding technology, and more specifically relates to a method for obtaining instant liquid phase diffusion connection of reliable joints of RAFM steel. Background technique [0002] With the rapid development of economy and society, human energy consumption is increasing day by day. The traditional non-renewable energy is gradually exhausted, so the development and utilization of renewable energy is imminent. As a kind of clean energy, nuclear energy has the advantages of good environmental compatibility, zero carbon emission, and cost-effectiveness. It is the trend of future energy development. Therefore, the continuous development of clean nuclear energy puts forward higher requirements for the safe, reliable and efficient operation of nuclear reactors. Due to the special environment in nuclear reactors, reactor structural materials need to withstand higher radiation doses, more complex corrosion environmen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K20/00B23K20/24C22C38/02C22C38/04C22C38/22C22C38/24C22C38/26B23K103/04
CPCB23K20/001B23K20/24C22C38/26C22C38/24C22C38/22C22C38/04C22C38/02B23K2103/04
Inventor 刘晨曦李文超刘永长王祖敏余黎明李会军
Owner TIANJIN UNIV
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