Pearlite steel wire rod austenitic grain size measuring method

A technology of austenite grain size and measurement method, which is applied in the field of determination of austenite grain size of pearlite wire rods, can solve the problems of not considering the original metallographic structure, and not forming the effective range of grain size. , to achieve the effect of simple sample preparation and quantitative reproducibility

Inactive Publication Date: 2015-12-23
武汉钢铁有限公司
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Problems solved by technology

This method statistically analyzes the effective grain size threshold by analyzing the grain boundary misorientation curve. The obtained "effective grain size" is a statistical result, and does not consider the original metallographic structure of the material. The comparison of this "effective grain size" is meaningless; it is feasible to compare in the same type of organization, but there is still no certain standard to regulate this "effective grain size", and there is no " The range of advantages and disadvantages of "effective grain size"

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  • Pearlite steel wire rod austenitic grain size measuring method

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Embodiment Construction

[0029] The present invention will be further described in detail below through specific examples.

[0030] according to figure 1 In the middle position, use wire cutting to cut a small piece from the pearlitic wire rod 1 to be tested as the sample 2, and the interception position is the area near the vertical line of the radius of the cross section of the wire rod 1 (the cross section is about 1 / 4 along the diameter) , the size of sample 2 is 10mm×5mm×2mm (cuboid). After grinding all samples 2 step by step with 240#, 360#, 400#, 800#, 1000#, 1200#, 1500#, 2000# metallographic sandpaper, choose diamonds with a particle size of 5 μm, 2.5 μm and 0.5 μm The polishing agent performs mechanical polishing on sample 2 in turn. Then electrolytic polishing is performed, the electrolyte is 8% perchloric acid ethanol solution, the parameters of electrolytic polishing are: voltage 24V, current 0.35A, polishing time 12s. The preparation requirements of the EBSD sample are: the surface of...

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Abstract

The invention discloses a pearlite steel wire rod austenitic grain size measuring method. The method comprises the following steps that 1, a small block is cut out from a pearlite steel wire rod to serve as a sample, and the sample is ground, mechanically polished and electrochemically polished; 2, one face of the sample is used as an observation area, and an EBSD system is used for carrying out face scanning on the sample to obtain an orientation imaging figure; 3, a certain deflection angle difference is set, orientation analysis software of the EBSD system is used for carrying out statistics on the grain size, an average grain diameter is obtained, and the pearlite steel wire rod austenitic grain size is calculated according to the average grain diameter. According to the method, the pearlite steel wire rod austenitic grain size is rapidly and accurately measured through the EBSD technology, sample preparation is easy, the result can be quantitative, and the reproducibility is good.

Description

technical field [0001] The invention relates to a method for analyzing iron and steel materials, in particular to a method for measuring the austenite grain size of pearlite-like wire rods. Background technique [0002] Austenite grain size is an important indicator of steel materials, which has an important impact on the plasticity and toughness of materials. According to the quality and technical requirements of steel, high-quality carbon structural steel, alloy structural steel, spring steel, carburized bearing steel and high-speed steel must be tested and rated for austenite grain size, usually requiring grade 5 or above. There are many test methods for the austenite grain size of steel. The national standard GB6394-86 "Determination of Average Metal Grain Size" stipulates that carburizing method, oxidation method, reticulated ferrite method, reticulated pearlite method, reticulated pearlite method, and reticulated pearlite method can be used. Cementite method and grain...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/02G01N1/32
Inventor 鲁修宇蒋跃东吴杰夏艳花仇东丽孙宜强黄静刘婳
Owner 武汉钢铁有限公司
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