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Method for observing metallographic structure on Monel alloy/steel surfacing interface

A technology of metallographic structure and Monel, which is applied in the field of observation of metallographic structure of Monel alloy/steel surfacing welding interface, can solve the problems of difficult to obtain, clear interface structure, etc., achieve easy operation, avoid serious corrosion effects, interface gold Clearly visible effect of phase structure

Active Publication Date: 2014-07-02
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 Monel 400 alloy / steel overlay welding interface metallographic sample is difficult to obtain a clear interface structure, so that Monel 400 Observation method of metallographic structure of Monel alloy / steel surfacing interface with clearly visible metallographic structure of alloy / steel surfacing interface

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  • Method for observing metallographic structure on Monel alloy/steel surfacing interface
  • Method for observing metallographic structure on Monel alloy/steel surfacing interface

Examples

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Effect test

Embodiment 1

[0018] Observation of interface metallographic structure of 10mm thick 16MnR steel plate surfacing welding thickness 6mm Monel 400 alloy:

[0019] Step 1: Machining a metallographic observation plane at the Monel 400 alloy / 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 grains on the metallographic observation plane are washed away after grinding;

[0020] 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 metallo...

Embodiment 2

[0025] Observation of interface metallographic structure of Monel 400 alloy with thickness 16mm Q235 steel plate surfacing welding thickness 3mm:

[0026] Step 1: Machining a metallographic observation plane at the Monel 400 alloy / 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 grains on the metallographic observation plane are washed away after grinding;

[0027] 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...

Embodiment 3

[0032] Observation of interface metallographic structure of Monel 400 alloy with thickness 10mm Q235 steel plate surfacing welding thickness 2mm:

[0033]Step 1: Machining a metallographic observation plane at the Monel 400 alloy / 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 grains on the metallographic observation plane are washed away after grinding;

[0034] 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 ...

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Abstract

The invention discloses a method for observing a metallographic structure on a Monel alloy / steel surfacing interface. The method comprises the following steps of: 1, machining a metallographic observation plane on the Monel-400 alloy / steel surfacing interface, grinding, and washing off sand particles; 2, mechanically polishing; 3, eroding a Monel-400 alloy part in the mechanically polished metallographic observation plane by adopting an erosion solution, and cleaning a steel part in the metallographic observation plane by adopting a nitric acid alcohol solution; and 4, observing the metallographic structure under a microscope. By the method, the Monel-400 alloy part of the Monel-400 alloy / steel surfacing interface is eroded with the erosion solution which is a mixture of an HCl saturated solution, an H2SO4 saturated solution, an HNO3 saturated solution and a CuSO4 saturated solution, so that severe erosion influence of an erodent on steel is avoided, and the structural hierarchy of a Monel-400 alloy surfacing layer is clear. The method is easy to operate; no special equipment is required; and the metallographic structure on the Monel-400 alloy / steel surfacing interface can be clearly observed.

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 Monel alloy / 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 welding Monel alloy on the steel substrate is a It is the most economical dissimilar alloy application method, and has been widely used in marine heat exchangers, seawater desalination equipment, salt production equipment, marine and chemical processing equipment, propeller shafts and water pumps, gasoline and water tanks, etc. Monel 400 alloy is a corrosion-resistant alloy with the largest amount, the widest application and excellent comprehensive pe...

Claims

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Application Information

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IPC IPC(8): G01N1/32
Inventor 马红征李进军李平仓何伟
Owner 西安汉唐分析检测有限公司
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