Rapid metallographic determination method for grain size of GCr15 steel bearing assembly

A technology of bearing components and measurement methods, which is applied in the field of rapid metallographic determination of grain size of GCr15 bearing components, can solve the problem of the difficulty in clearly displaying the grain boundary outline of GCr15 bearing components, the inability to measure the grain size of GCr15 bearing components, and the time consumption of the corrosion process Long and other problems, to achieve the effect of efficient and accurate determination of grain size, clear outline of grain boundary, and low cost

Inactive Publication Date: 2013-10-09
WUHAN UNIV OF TECH
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Problems solved by technology

However, for GCr15 bearing components at present, the existing chemical etching method is difficult to accurately control the proportion of corrosion solution, the corrosion process takes a long time, and it is usually difficult to clearly display the grain boundary outline of GCr15 bearing components, which brings great difficulties to the determination of grain size. Very difficult, resulting in many bearing manufacturers unable to accurately and effectively measure the grain size of the GCr15 bearing components produced

Method used

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  • Rapid metallographic determination method for grain size of GCr15 steel bearing assembly
  • Rapid metallographic determination method for grain size of GCr15 steel bearing assembly

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Embodiment 1

[0020] Cut a GCr15 bearing ring into a sample of 8mm×10mm10×4mm, after inlaying, carry out rough grinding, fine grinding and polishing, and clean and dry. Its grain size metallographic determination is realized according to the following steps:

[0021] 1) Preparation of corrosion solution:

[0022] ①. Take 80ml of distilled water, heat at a heating rate of 8°C / min, add 3.5g of picric acid evenly during the heating process, and keep stirring;

[0023] ②. When the picric acid solution is heated to a boiling state and is supersaturated, add 0.2 g of sodium dodecylbenzenesulfonate and stir evenly;

[0024] ③. Control the temperature of the solution at 90±5°C to keep the solution in a slight boiling state to obtain a corrosion solution;

[0025] 2) Corrosion of bearing assembly samples:

[0026] ①. Immerse the GCr15 bearing ring sample that has been roughly ground, finely ground, polished, cleaned and dried in the corrosion solution, keep the corroded surface in full and unifor...

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Abstract

The invention belongs to the technical field of bearing detection. The invention relates to a rapid metallographic determination method for of grain size of a GCr15 steel bearing assembly. The rapid metallographic determination method comprises the following steps of 1), preparing an etching solution; 2), etching a sample of the bearing assembly; 3), determining the grain size: shooting a metallograph of a grain boundary profile by using an optical microscope, then determining the grain size of the metallograph by using image analysis software and in reference to steel size determination standards of an average grain size of the steel by an intercept method. The clear grain boundary profile can be obtained by using a rapid and easily operational chemical etching method; and efficient and accurate determination for the GCr15 steel bearing assembly can be realized by combining the metallographic determination method for the grain size.

Description

technical field [0001] The invention belongs to the technical field of bearing detection, and in particular relates to a rapid metallographic determination method for the grain size of a GCr15 bearing component. Background technique [0002] GCr15 steel is currently the most widely used steel for bearing manufacturing, and is widely used in the processing and manufacturing of two important components of bearings, bearing rings and rolling elements. Since bearing rings and rolling elements have an important impact on bearing life, their organizational state has always been the focus of attention in the bearing manufacturing process. Among them, the grain size is considered to be an important indicator for judging the quality of the structure of bearing components because it reflects the grain size and distribution density. Therefore, the determination of grain size has always been an important test content in the production of bearing components. The determination of grain s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/02G01N1/32
Inventor 毛华杰华林钱东升尹飞
Owner WUHAN UNIV OF TECH
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