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System display method of original austenite grain boundary of high-carbon high-alloy die steel

A technology of alloy die steel and austenite grain boundary, which is applied in the preparation of test samples, testing of moving fluid/granular solid, etc., can solve problems such as corrosion resistance and grain boundary difficulties, and achieve corrosion resistance and benefit Evaluation of grain size, beneficial effect of measurement

Inactive Publication Date: 2017-09-01
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using the first metallographic etchant or the second metallographic etchant to corrode high-carbon and high-alloy die steel can make the original austenite grain boundary of high-carbon and high-alloy die steel show clearly and continuously, and overcome the corrosion resistance and grain boundary of high-carbon and high-alloy steel. Difficult problems appearing in the world

Method used

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  • System display method of original austenite grain boundary of high-carbon high-alloy die steel
  • System display method of original austenite grain boundary of high-carbon high-alloy die steel
  • System display method of original austenite grain boundary of high-carbon high-alloy die steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] In the heat treatment process of high-carbon and high-alloy mold steel samples, the heating temperature is lower than 1100°C, and the holding time is within 400s, and the first metallographic etchant is selected;

[0028] The specific steps of the prior austenite grain boundary display method are as follows:

[0029] 1. Prepare the sample: Cut the sample into the required shape by wire cutting machine. If the sample is too small and not easy to clamp, it can be inlaid; the sample is polished with metallographic sandpaper of different particle sizes as abrasives, from coarse to fine , before changing the small-grained sandpaper each time, make the scratch direction on the polished surface of the sample consistent, and rotate it 90 degrees after the replacement. When the minimum particle size is 1000-1200 mesh, it can be polished by a polishing machine. The sample preparation is successful when the surface is smooth and without scratches;

[0030] 2. Preparation of the f...

Embodiment 2

[0034] During the heat treatment process of high-carbon and high-alloy mold steel samples, the heating temperature exceeds 1100°C, the holding time exceeds 400s, and the second metallographic etchant is used;

[0035] The specific steps of the prior austenite grain boundary display method are as follows:

[0036] 1. Prepare the sample: Cut the sample into the required shape by wire cutting machine. If the sample is too small and not easy to clamp, it can be inlaid; the sample is polished with metallographic sandpaper of different particle sizes as abrasives, from coarse to fine , before changing the small-grained sandpaper each time, make the scratch direction on the polished surface of the sample consistent, and rotate it 90 degrees after the replacement. When the minimum particle size is 1000-1200 mesh, it can be polished by a polishing machine. The sample preparation is successful when the surface is smooth and without scratches;

[0037] 2. Preparation of the second metal...

Embodiment 3

[0042] In the heat treatment process of high-carbon and high-alloy mold steel samples, the heating temperature is lower than 1100°C, and the holding time is within 400s, if the second metallographic etchant is used;

[0043] The specific steps of the prior austenite grain boundary display method are as follows:

[0044] 1. Prepare the sample: Cut the sample into the required shape by wire cutting machine. If the sample is too small and not easy to clamp, it can be inlaid; the sample is polished with metallographic sandpaper of different particle sizes as abrasives, from coarse to fine , before changing the small-grained sandpaper each time, make the scratch direction on the polished surface of the sample consistent, and rotate it 90 degrees after the replacement. When the minimum particle size is 1000-1200 mesh, it can be polished by a polishing machine. The sample preparation is successful when the surface is smooth and without scratches;

[0045] 2. Preparation of the secon...

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Abstract

The invention discloses a system display method of an original austenite grain boundary of high-carbon high-alloy die steel. In the method, different corrosive agents are selected according to the heat treatment process of a sample; when the heating temperature exceeds 1100 DEG C, and the heat preservation time exceeds 400 s, a second metallographic etchant is selected and used; on the contrary, when the heating temperature is equal to or lower than 1100 DEG C, and the heat preservation time is within 400 s, a first metallographic etchant is selected and used; the treatment steps are as follows: sample preparation, corrosive agent preparation, sample corrosion and image acquisition. By applying the system display method disclosed by the invention, the grain boundary of the high-carbon high-alloy die steel sample under different heat treatment conditions can be systematically displayed, the original austenite grain size of the high-carbon high-alloy die steel can be clearly distinguished, the technical problem of difficult corrosion resistance and grain boundary display of the high-carbon high-alloy die steel is solved, and the measurement of the grain size and the evaluation of the grain size are greatly facilitated.

Description

technical field [0001] The invention belongs to the technical field of metallographic preparation, in particular to a method for systematically displaying the original austenite grain boundary of high-carbon and high-alloy mold steel. Background technique [0002] The austenite grain size of steel is one of the main indicators affecting the performance of steel. The study of austenite grain size is of great significance to the production process of steel and the quality control of steel products. High-carbon high-alloy die steel has high hardness and certain hardening depth, and is widely used in machinery manufacturing, radio instruments, motors, electrical appliances and other industries. Due to the large amount of chromium, manganese, molybdenum and other alloying elements, high-carbon high-alloy die steel has strong oxidation resistance and corrosion resistance, which brings inconvenience to the staff engaged in metallographic observation. [0003] The grain size of iro...

Claims

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Application Information

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IPC IPC(8): G01N1/32G01N1/44G01N21/85
CPCG01N1/32G01N1/44G01N21/85
Inventor 刘利刚张超凡于辉翟建伟王三众宫跃鸣邹海贝刘入杰
Owner YANSHAN UNIV
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