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A method for observing the metallographic structure of copper-nickel/steel surfacing interface

A technology of metallographic structure and copper-nickel, which is applied in the observation field of copper-nickel/steel surfacing interface metallographic structure, can solve the problems such as difficult to obtain the interface structure, achieve the interface metallographic structure to be clearly visible, avoid serious erosion effects, and easily The effect of the operation

Active Publication Date: 2015-12-30
西安汉唐分析检测有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a method that can effectively solve the problem that the existing copper-nickel / steel surfacing interface metallographic samples are difficult to obtain a clear interface structure, so that the copper-nickel / steel surfacing Observation method of copper-nickel / steel surfacing interface metallographic structure with clearly visible metallographic structure of welding interface

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  • A method for observing the metallographic structure of copper-nickel/steel surfacing interface
  • A method for observing the metallographic structure of copper-nickel/steel surfacing interface

Examples

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Embodiment 1

[0020] Observation of interface metallographic structure of copper-nickel with thickness 16mm Q235 steel plate surfacing welding thickness 8mm:

[0021] Step 1: Machining a metallographic observation plane at the copper-nickel / steel surfacing interface, and then using the machined metallographic observation plane on a metallographic grinding machine with 150 # and 700 # The metallographic water sandpaper is ground step by step, and the grinding direction is rotated 90° every time the grain size sandpaper is changed to ensure that the last grinding trace is completely eliminated, and the sand grains on the metallographic observation plane are washed away after grinding;

[0022] Step 2. Place the metallographic observation plane where the sand grains have been washed out in step 1 on the polishing machine, and use Cr 2 o 3 Solution and diamond powder with a particle size of 2.5 μm are mechanically polished until there are no scratches and drags on the surface of the metallogr...

Embodiment 2

[0027] Observation of the interface metallographic structure of 16MnR steel plate with a thickness of 10mm and copper-nickel with a thickness of 8mm:

[0028] Step 1: Machining a metallographic observation plane at the copper-nickel / steel surfacing interface, and then using the machined metallographic observation plane on a metallographic grinding machine with 150 # and 700 # The metallographic water sandpaper is ground step by step, and the grinding direction is rotated 90° every time the grain size sandpaper is changed to ensure that the last grinding trace is completely eliminated, and the sand on the metallographic observation plane is washed away after grinding;

[0029] Step 2. Place the metallographic observation plane where the sand grains have been washed out in step 1 on the polishing machine, and use Cr 2 o 3 Solution and diamond powder with a particle size of 2.5 μm are mechanically polished until there are no scratches and drags on the surface of the metallograp...

Embodiment 3

[0034] Observation of the interface metallographic structure of 16MnR steel plate with a thickness of 10mm and copper-nickel with a thickness of 8mm:

[0035] Step 1: Machining the metallographic observation plane at the copper-nickel / steel surfacing interface, and then using the metallographic observation plane on the metallographic grinding machine successively with 150 # and 700 # The metallographic water sandpaper is ground step by step, and the grinding direction is rotated 90° every time the grain size sandpaper is changed to ensure that the last grinding trace is completely eliminated, and the sand on the metallographic observation plane is washed away after grinding;

[0036] Step 2. Place the metallographic observation plane where the sand grains have been washed out in step 1 on the polishing machine, and use Cr 2 o 3 Solution and diamond powder with a particle size of 2.5 μm are mechanically polished until there are no scratches and drags on the surface of the met...

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Abstract

The invention discloses a copper nickel / copper overlaying interface metallographic structure observation method which comprises the steps that first, a metallographic observation plane is machined on a copper nickel / copper overlaying interface in a mechanical mode, grinding is carried out , sand is flushed; second, mechanical polishing is carried out; third, an erosion solution is heated, the heated erosion solution is used for wiping the interface of the metallographic observation plane for erosion after mechanical polishing; fourth, observation under a microscope is carried out. According to the method, the erosion solution formed by mixing HCl, HNO3 and CuCl2 saturated solutions is used for wiping the copper nickel / copper overlaying interface for erosion, severe erosion influence on steel of erosion agents is avoided, and meanwhile the organization structure layers of a copper nickel overlaying layer and a steel side can be obtained clearly. The method is easy to operate, no special equipment is needed, and the metallographic structure of the copper nickel / copper overlaying interface can be observed clearly.

Description

technical field [0001] The invention belongs to the technical field of material surface structure measurement, and in particular relates to a method for observing the metallographic structure of the copper-nickel / steel surfacing interface. Background technique [0002] The connection of dissimilar materials not only realizes special functions, but also saves manufacturing costs. It is widely used in various fields of industrial production. Surfacing welding has become an important way of connecting dissimilar materials. Surfacing copper-nickel alloys on steel substrates, that is, Copper-nickel alloy has good corrosion resistance (especially seawater corrosion resistance and biological fouling precipitation), and has good weldability, formability, elongation, and thermal conductivity of steel, and is used in petrochemical, metallurgy, and salt production Soda making, hydraulic industry. In order to study the distribution of Fe elements in the copper-nickel / steel surfacing la...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/84G01N1/32
Inventor 马红征杜小平惠晓原
Owner 西安汉唐分析检测有限公司
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