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Method for improving liquid metal corrosion resistance of martensitic heat-resistant steel

A liquid metal and heat-resistant steel technology, applied in the field of laser cladding treatment and coating metal surface, can solve the problems of complex aluminum compounds, deterioration of metal mechanical properties, and high aluminum activity, to improve corrosion resistance, increase Liquid metal corrosion resistance and improved adhesion

Active Publication Date: 2014-09-17
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the high activity of aluminum, if more than 5% Al is directly added to the matrix, it is easy to form complex aluminum compounds and deteriorate the mechanical properties of the metal.

Method used

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  • Method for improving liquid metal corrosion resistance of martensitic heat-resistant steel
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  • Method for improving liquid metal corrosion resistance of martensitic heat-resistant steel

Examples

Experimental program
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Effect test

Embodiment 1

[0025] (1) Pretreatment of the metal surface: the metal sample with a size of 15mm×10mm×2mm was polished step by step to No. 800 with metallographic sandpaper, and all the edges and corners were rounded, and the surface was wetted with 200 mesh glass pellets. Sand blasting, cleaning with metal detergent, ultrasonic cleaning in deionized water, and drying.

[0026] (2) The aluminum layer is preset on the metal surface by arc ion plating, and the purity of the aluminum target is above 99%. The process conditions of arc ion plating: the vacuum degree of the vacuum chamber is 9.5×10 -3 Pa, the protective gas pressure is kept at 2Pa, the furnace chamber temperature is 130°C, the bias voltage is -800V, the arc current is 55A, the pre-sputter cleaning is 3min, and other parameters are kept unchanged, the bias voltage is adjusted to -225V, on the metal substrate Depositing an aluminum layer with a thickness of 8 μm;

[0027] (3) Laser cladding process: use the energy of the laser bea...

Embodiment 2

[0032] The chemical composition of 9-12% Cr martensitic heat-resistant steel is: C: 0.1wt.%, Cr: 9.04wt.%, Si: 0.26wt.%, Mn: 0.46wt.%, Mo: 0.92wt.%. , Ni: 0.17wt.%, V: 0.2wt.%, Nb: 0.04wt.%, and the balance is iron. The surface treatment process of the metal is the same as in Example 1. After corroding in the liquid lead-bismuth eutectic at 600°C for 500 hours, the cross-sectional morphology is not much different from that of Example 1, and its mechanical properties are basically unchanged.

Embodiment 3

[0034] The chemical composition of 9-12% Cr martensitic heat-resistant steel is: C: 0.22wt.%, Cr: 10.73wt.%, Si: 1.56wt.%, Mn: 0.67wt.%, W: 1.41wt.%. , Ta: 0.19wt.%, V: 0.21wt.%, Nb: 0.01wt.%, and the balance is iron. The surface treatment process of the metal is the same as in Example 1. After corroding in the liquid lead-bismuth eutectic at 600°C for 500 hours, the cross-sectional morphology is not much different from that of Example 1, and its mechanical properties are basically unchanged.

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Abstract

The invention aims to provide a method for carrying out liquid metal corrosion treatment on the surface of martensitic heat-resistant steel. The method comprises the following steps: after prearranging a layer of aluminum on a metal surface by virtue of electric arc ion plating, processing by using a laser cladding process, and controlling the surface aluminum activity to form compact and stable aluminum oxide. Therefore, the liquid metal corrosion resistance of metal is effectively improved, and the service life of the metal material is prolonged.

Description

technical field [0001] The invention belongs to the technical field of metal surface treatment, and in particular provides a process method for coating and laser cladding treatment on the metal surface. Background technique [0002] With the increasingly prominent environmental and safety issues, and the gradual depletion of traditional energy sources, the development of new energy sources is imminent. The ADS transmutation system (Accelerator Driven Transmutation System) is one of the ideal choices to deal with the above challenges. With its efficient use of nuclear waste and high system security, the ADS transmutation system has solved the nuclear waste disposal problem that has always restricted the sustainable development of nuclear power. It is one of the most promising new energy systems at present. Due to their good thermophysical and chemical properties, liquid lead and liquid lead-bismuth eutectic are considered as the materials of choice for spallation targets and...

Claims

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Application Information

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IPC IPC(8): C23C14/58C23C14/32C23C14/16
Inventor 严伟石全强杨振国单以银王威杨柯
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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