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Corrosive agent and display method of original austenite grain boundary of ultra-high strength alloy structural steel

A technology of alloy structural steel and austenite grain boundary, applied in the field of metallographic structure observation, can solve the problem of difficulty in displaying original austenite grain boundary of D6AE steel

Active Publication Date: 2017-07-07
成都积微物联集团股份有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention provides a method for clearly displaying the original austenite grain boundary of ultra-high-strength alloy structural steel D6AE steel and the corrosive agent used in the method for the above-mentioned defects; thereby solving the problem of difficulty in displaying the original austenite grain boundary of D6AE steel

Method used

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  • Corrosive agent and display method of original austenite grain boundary of ultra-high strength alloy structural steel
  • Corrosive agent and display method of original austenite grain boundary of ultra-high strength alloy structural steel

Examples

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Embodiment 1

[0033] Example 1: Determination of the prior austenite grain size of a certain D6AE forging

[0034] The technological process and steps of the present embodiment are as follows:

[0035] 1. Heat treatment: Process the D6AE forging into a test sample of 10mm×15mm×20mm, place it in a box-type resistance furnace heated to 575°C, keep it warm for 120 minutes, and then cool it to 450°C before taking it out of the furnace and air cooling to room temperature;

[0036] 2. Grinding and polishing: Take the tempered test sample to the grinder for preliminary grinding. After the rough ground test sample is rinsed with clean water, put the grinding surface in turn on each gold plate from coarse to fine. Finely polish on the same sandpaper; each time the next finer sandpaper is changed, the test sample should be rotated 90° for grinding; finally, the ground test sample should be washed and polished on a polishing machine to make the test sample The observation surface achieves a mirror ef...

Embodiment 2

[0044] Example 2: Determination of the grain size of prior austenite in a certain D6AE steel pipe

[0045] The technological process and steps of the present embodiment are as follows:

[0046] 1. Heat treatment: Process the D6AE steel pipe into a test sample of 10mm×10mm×20mm, place it in a box-type resistance furnace heated to 585°C, keep it warm for 600 minutes, and then cool it to 200°C before taking it out of the furnace and air cooling to room temperature;

[0047] 2. Grinding and polishing: Take the tempered test sample to the grinder for preliminary grinding. After the rough ground test sample is rinsed with clean water, put the grinding surface on the metallographic scale from coarse to fine. Carry out fine grinding on the sandpaper; each time the next finer sandpaper is changed, the test sample should be rotated 90° for grinding; finally, the ground test sample should be washed and polished on a polishing machine, so that the test sample can be observed The surface ...

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Abstract

The invention belongs to the technical field of metallographic structure observation, and in particular relates to a method for displaying the original austenite grain boundary of ultra-high-strength alloy structural steel D6AE steel. A corrosion agent for the original austenite grain boundary of ultra-high-strength alloy structural steel, which is composed of the following components in the weight ratio: picric acid: 4.5-5.5 parts by weight, fatty alcohol polyoxyethylene ether: 7.5-8.5 parts by weight, chlorine Cuproammonium: 1.8-2.8 parts by weight, water: 100 parts by weight, hydrogen peroxide: 6.6-8.1 parts by weight. The corrosive agent of the invention can clearly display the original austenite grains of the ultra-high-strength alloy structural steel D6AE steel, thereby solving the problem of difficulty in displaying the original austenite grain boundaries of the D6AE steel.

Description

technical field [0001] The invention belongs to the technical field of metallographic structure observation, and in particular relates to a method for displaying the original austenite grain boundary of ultra-high-strength alloy structural steel D6AE steel. Background technique [0002] Ultra-high-strength alloy structural steel D6AE is a low-alloy ultra-high-strength steel for aerospace. It is widely used in the manufacture of missile engine shells and aircraft structural parts. It belongs to medium-carbon chromium-nickel-manganese steel. Due to its extremely high requirements on strength, impact toughness, fracture toughness and stress corrosion resistance, it is generally smelted by double vacuum method of vacuum induction + vacuum arc remelting or electroslag remelting method. Sulfur, phosphorus, The content of impurity elements such as arsenic, selenium, and lead is very low, and the impurity elements that diffuse and segregate from the inside of the grain to the edge o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F1/28G01N1/32
CPCC23F1/28
Inventor 陈雨杨其光谢勇张先华
Owner 成都积微物联集团股份有限公司
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