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Preparation method of 40CrNiMoA steel grain size sample

A technology of grain size and steel material, which is applied in the field of aerospace material testing, can solve the problems of sample preparation failure and inability to accurately display grain size, etc.

Inactive Publication Date: 2019-01-01
SHAANXI AIRCRAFT CORPORATION
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Problems solved by technology

[0004] The present invention overcomes that when the existing common oxidation method is used for crystal grain appearance, only a small grinding surface with an appropriate inclination can be ground. And even if the properly inclined sample is successfully prepared, the grain size defects cannot be accurately displayed in the subsequent grain size rating

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  • Preparation method of 40CrNiMoA steel grain size sample

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Embodiment Construction

[0020] Below in conjunction with accompanying drawing and specific implementation method, the present invention is described in detail:

[0021] Provide a kind of preparation method of 40CrNiMoA steel grain size sample, comprise the steps:

[0022] Step 1. Pretreatment of steel samples

[0023] Cut the sample of grain size on 40CrNiMoA steel material, heat treat the sample of grain size, the heating temperature is 860°C±10°C, the heating time is 1 hour, and then water-cooled;

[0024] Step 2. Metallographic sample grinding and polishing:

[0025] The sample is coarsely ground, using 180# water-grinding paper for coarse grinding, and then finely grinding with 400#, 600#, 800#, 1000# water-grinding paper. Grind in the direction of the sandpaper, and every time the sandpaper is replaced, the sample must be cleaned, and the normal direction of the grinding surface is used as the rotation center, and the sample is rotated 45° to 90°, so that the previous sandpaper wear marks are ...

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Abstract

The invention relates to a preparation method of a 40CrNiMoA steel grain size sample. The method comprises the following steps of pretreatment of the sample, preparation, grinding and polishing of a metallographic sample, and corrosion and drying of the sample. By reasonably matching hydrochloric acid, copper sulfate and an additive and selecting a corrosive mode properly, the grain boundary of 40CrNiMoA steel can be clearly shown to obtain complete sizes and distribution information of grains, and an important basis can be provided for inferring the use performance thereof and optimizing thermal treatment process.

Description

technical field [0001] The invention belongs to the field of aviation material testing and relates to a method for preparing a 40CrNiMoA steel grain size sample. Background technique [0002] As we all know, the grain size and uniformity of steel have a great influence on various performance indicators of steel, which is of great significance in actual production. For quenched and tempered 40CrNiMoA steel, too large grains will not only cause poor performance of 40CrNiMoA steel, but also seriously restrict the service life of 40CrNiMoA steel. Therefore, whether the grain boundaries of 40CrNiMoA steel can be clearly displayed and the complete grain size and distribution information can be obtained becomes the key to the final accurate and reliable evaluation results. Contents of the invention [0003] purpose of the invention [0004] The present invention overcomes that when the existing common oxidation method is used for crystal grain appearance, only a small grinding ...

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Application Information

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IPC IPC(8): G01N1/28G01N1/32
CPCG01N1/28G01N1/286G01N1/32G01N2001/2866
Inventor 贾智宇邬建新王宇魁李慧王娟赵燕张媛媛王景海刘跃邢建伟
Owner SHAANXI AIRCRAFT CORPORATION
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