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Method for observing metallographic structure of Hastelloy/steel overlaying welding interface

A technology of Hastelloy and metallographic structure, applied in the field of observation of metallographic structure of Hastelloy/steel surfacing interface, can solve the problems of difficult to obtain, clear interface structure, etc., to achieve easy operation, avoid serious erosion effects, interface Clearly visible effect of metallographic structure

Active Publication Date: 2014-01-29
西安汉唐分析检测有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 C-276 Hastelloy / steel overlay welding interface metallographic sample is difficult to obtain a clear interface structure for the above-mentioned deficiencies in the prior art, so that C -276 Hastelloy / Steel Surfacing Interface Metallographic Structure Observation Method for Hastelloy / Steel Surfacing Interface Metallographic Structure Clearly Visible

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  • Method for observing metallographic structure of Hastelloy/steel overlaying welding interface

Examples

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Effect test

Embodiment 1

[0015] Observation of the interface metallographic structure of C-276 Hastelloy alloy with a thickness of 35mm Q235 steel plate with a thickness of 5mm:

[0016] Step 1: Machining the metallographic observation plane at the C-276 Hastelloy / 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;

[0017] 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 surfa...

Embodiment 2

[0022] Observation of interface metallographic structure of C-276 Hastelloy alloy with a thickness of 40mm Q235 steel plate surfacing welding thickness 6mm:

[0023] Step 1: Machining the metallographic observation plane at the C-276 Hastelloy / 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;

[0024] 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 s...

Embodiment 3

[0029] Observation of the interface metallographic structure of C-276 Hastelloy alloy with a thickness of 30mm Q235 steel plate with a thickness of 5mm:

[0030] Step 1: Machining the metallographic observation plane at the C-276 Hastelloy / 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;

[0031] 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 surfa...

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Abstract

The invention discloses a method for observing a metallographic structure of a Hastelloy / steel overlaying welding interface. The method comprises the following steps of: (1) machining a metallographic observation plane at the C-276 Hastelloy / steel overlaying welding interface, grinding, and rinsing off sand grains; (2) mechanically polishing; (3) taking a stainless steel plate as a cathode, taking a sulfuric acid solution as an electrolytic solution, carrying out electrolysis on the metallographic observation plane, and then, wiping the steel part by using nital; and (4) observing under a microscope. According to the method for observing the metallographic structure of the Hastelloy / steel overlaying welding interface, the sulfuric acid solution is adopted to electrolyze the metallographic observation plane at the C-276 Hastelloy / steel overlaying welding interface, so that the influence of serious etching on steel caused by an etching agent is avoided, and the organization structure of a C-276 Hastelloy overlaying welding layer can be clear in layer. The method has the advantages that the operation is easy, any special equipment is not required, the metallographic structure of the C-276 Hastelloy / steel overlaying welding interface can be clearly observed, and the boundary lines and metallurgical structure of the overlaying welding interface are clearly visible.

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 Hastelloy / 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. Using surfacing technology to surfacing C-276 on the surface of the workpiece Hastelloy, which enables ordinary metal materials to obtain special properties of corrosion resistance. C-276 Hastelloy belongs to nickel-molybdenum-chromium-iron-tungsten nickel-based alloy, which is the most corrosion-resistant of modern metal materials. It is mainly resistant to chlorine, various oxidizing chlorides, chloride salt solutions, sulfuric acid and oxidizing salts, and has go...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/28G01N1/32
Inventor 马红征李进军汪洋王虎年惠晓原
Owner 西安汉唐分析检测有限公司
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