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Electrochemical rapid hydrogen diffusion method for large forgings

A large-scale forging, electrochemical technology, applied in the field of rapid hydrogen removal, can solve the problems of asynchrony in the transformation of the internal structure of temperature difference, unable to completely eliminate white spot defects, waste of energy and production equipment, etc., to avoid white spot defects and shorten expansion. Hydrogen time, energy saving effect

Inactive Publication Date: 2018-11-06
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In production, the thermal hydrogen expansion annealing process carried out according to traditional methods and experience needs to consume a lot of energy and time
At the same time, the heating and cooling time of large forgings is longer, which causes a huge temperature difference between the surface and the core of the forging and the internal structure transformation is not synchronized. The internal stress generated will hinder the transformation of its internal structure, and even lead to cracks, resulting in large forgings Overall fracture scrap
Therefore, the traditional hydrogen expansion annealing process is complicated to operate and needs to be carried out at high temperature, which causes a huge waste of energy and production equipment, and cannot completely eliminate white spot defects

Method used

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  • Electrochemical rapid hydrogen diffusion method for large forgings
  • Electrochemical rapid hydrogen diffusion method for large forgings
  • Electrochemical rapid hydrogen diffusion method for large forgings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 40Cr was cut and processed into a square thin plate forging with a side length of 3 cm and a thickness of 1 mm. The surface of the forging was polished to a mirror surface, rinsed with clean water, wiped with cotton gauze dipped in ethanol, and dried in a ventilated place for experimental use.

[0027] The forging as the anode is placed in the electrolytic cell of the electrochemical hydrogen expansion device, the electrolytic cell is filled with the prepared electrolyte, and the electrolyte is submerged in the forging; the electrolyte is 1L with a concentration of 0.2mol / L Sodium hydroxide solution, 0.8g of sodium sulfide is added to the electrolyte as an activator, and the temperature of the electrolyte is 25°C.

[0028] Turn on the power supply, apply constant potential polarization to the forging, and apply a polarization constant potential of 0.15V (relative to the reference electrode) to the forging provided by the potentiometer, observe and record the change of th...

Embodiment 2

[0030] The 65Mn specimen was cut and processed into a square thin plate specimen with a side length of 3 cm and a thickness of 1 mm. The surface of the specimen was polished to a mirror surface, rinsed with clean water, wiped with cotton gauze dipped in ethanol, and dried in a ventilated place for the experiment use. Adopt the method as embodiment 1, wherein electrolytic solution is the sodium hydroxide solution that 1L concentration is 0.15mol / L, adds 1.2g sodium sulfide as activator in electrolytic solution, applies 0.15V (relative to reference electrode) to forging Polarization constant potential, when the current density is less than 0.5μA / cm 2 , it can be considered that the hydrogen in the forging has dropped below the limit hydrogen content without white spots, and the experiment is ended.

Embodiment 3

[0032]The hydrogen pumped test piece and the untreated test piece in Example 1 and Example 2 were prepared into tensile samples by wire cutting. The hydraulic material universal testing machine was used to carry out the tensile test, and the stress-strain curves were recorded respectively, and the experimental results were compared.

[0033] Experiments show that the plasticity of the hydrogen pumped specimen is better than that of the untreated specimen, and its tensile strength is increased by about 1-5 percentage points.

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Abstract

The invention discloses an electrochemical rapid hydrogen diffusion method for large forgings. A forging as an anode is arranged in an electrolytic cell of an electrochemical hydrogen expansion device, an electrolyte is stored in the electrolytic cell and submerges the forging, the electrolyte is a sodium hydroxide solution having a concentration of 0.05 to 0.4 mol / L, the electrolyte has a temperature of 0-100 DEG C, a power supply is started and applies polarization constant potential of 0.1-5V / dm<2> to the forging so that the forging is polarized, in the experiment, a reference electrode isused as a zero potential point, the voltage is the potential difference relative to the zero potential point, the current change of the anode is observed and recorded and when the current density is less than a certain value of 0.5 micro-A / cm<2>, the reaction is finished. The method has the advantages of simple processes, convenient operation, easy control, energy saving, short aging time, low temperature and low energy consumption.

Description

technical field [0001] The invention relates to a hot processing method in the forming and manufacturing of large forgings, especially a rapid hydrogen removal method. Background technique [0002] Large-scale forgings are key components in the machinery manufacturing industry, especially for heavy equipment such as nuclear power, thermal power generator rotors, wide and thick plate rolling rolls, large ship crankshafts, etc. Hot forming is the key process link. It has the characteristics of high manufacturing difficulty, high cost and long cycle. Due to the huge size and weight of large parts, the segregation, shrinkage cavity and porosity defects inside the forging seriously affect the forging quality. In particular, equipment damage caused by hydrogen damage is difficult to predict and evaluate. Although vacuum smelting and heat treatment hydrogen expansion technologies were adopted in the project, the problem of hydrogen hazard cannot be completely eradicated. Therefo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D3/06
CPCC21D3/06
Inventor 杜凤山李凌霄许志强
Owner YANSHAN UNIV
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