Wear-resistant 450 steel austenite grain size detection method

A technology of austenite grains and detection methods, applied in grain size analysis, measuring device, particle and sedimentation analysis, etc., can solve the problems of blurred grain boundaries, erosion of matrix structure, affecting the observation of austenite grain size, etc. , to achieve the effect of solving blurred grain boundaries, simple method and process, and promoting clarity

Inactive Publication Date: 2014-11-26
武钢集团有限公司
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AI Technical Summary

Problems solved by technology

[0003] Due to the finer structure of wear-resistant steel and the finer structure of high-strength wear-resistant 450 steel, about grade 11, it is difficult to clearly display the austenite grain size by existing methods, and the grain boundaries are prone to be blurred, or The phenomenon that the matrix structure is eroded out affects the observation of the original austenite grain size, which brings difficulties to the evaluation of the grain size, and even cannot be evaluated. It is impossible to accurately judge the performance of the wear-resistant steel obtained, and thus cannot effectively guide the wear-resistant steel production process

Method used

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  • Wear-resistant 450 steel austenite grain size detection method
  • Wear-resistant 450 steel austenite grain size detection method
  • Wear-resistant 450 steel austenite grain size detection method

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Embodiment 1

[0029] The chemical composition and weight content of wear-resistant 450 steel are: C: 0.23%, Si: 0.42%, Mn: 1.53%, Cr: 0.52%, Mo: 0.32%, B: 0.002%, Ti: 0.05%, S: 0.005%, P: 0.007%, the rest is Fe and unavoidable impurities.

[0030] The method for detecting austenite grain size of wear-resistant 450 steel is carried out as follows:

[0031] 1) Take the 20mm wear-resistant 450 steel plate produced in large-scale production and cut the steel plate into small cubes with side lengths of 18-22mm, preferably processed and cut into 20×20×20mm squares to be tested. ;

[0032] 2) Quenching treatment: Put the samples into the heat treatment furnace in batches, so that the samples are in the middle of the furnace space, to ensure that the temperature near the samples is the same as the temperature detected by the thermocouple, and the samples are heated to 800 ℃~1000℃, preferably 850℃~900℃, holding time: 20-60 minutes, preferably 30-50 minutes, the quenching temperature of the 4 samples to b...

Embodiment 2

[0037] The chemical composition and weight content of wear-resistant 450 steel are: C: 0.26%, Si: 0.63%, Mn: 1.63%, Cr: 0.31%, Mo: 0.41%, B: 0.0015%, Ti: 0.06%, S: 0.004%, P: 0.008%, the rest is Fe and unavoidable impurities.

[0038] The method for detecting austenite grain size of wear-resistant 450 steel is carried out as follows:

[0039] 1) Take the 20mm wear-resistant 450 steel plate produced in large-scale production and process it into 4 pieces to be tested in a square shape of 20×20×20mm;

[0040] 2) Quenching treatment: Put the samples into the heat treatment furnace in batches, the quenching temperature is 900℃, and the holding time is 20min, 40min, 60min and 80min respectively. Observe the change of austenite grain size at different quenching temperatures. After that, use a clamp to pick up the sample and quickly take it out of the furnace. The sample is immediately quenched into the flowing water, and the test sample is taken out after it is completely cold. The cross-s...

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Abstract

The invention discloses a wear-resistant 450 steel austenite grain size detection method which comprises the following steps: 1) preparation of a sample; 2) quenching treatment: heating the sample to 800 DEG C-1000 DEG C, carrying out heat preservation for 20-60 minutes, and then quickly quenching the heated sample into water; 3) erosion: fully mixing a saturated picric acid solution and a washing liquid according to a volume ratio of 1:2-4 to obtain an erosion agent; and putting the to-be-tested sample after quenching treatment into the erosion agent, eroding for 3-6 minutes at the temperature of 20-50 DEG C, then taking out, washing cleanly with water, and blow-drying; and 4) grain grading: carrying out metallographic observation on the sample after blow-drying, taking pictures on austenite grains, contrasting with standard atlas by a comparative method, and grading. The saturated picric acid solution and the washing liquid are mixed to obtain the erosion agent, the erosion agent is adopted for eroding the high-strength wear-resistant steel 450, the purpose that only original austenite grain boundaries are clearly displayed and a matrix structure is not displayed is reached, and thus a condition is created for accurate evaluation of the original austenite grain boundaries.

Description

Technical field [0001] The invention relates to metallurgical analysis technology, in particular to a method for detecting austenite grain size of wear-resistant 450 steel. Background technique [0002] As a wear-resistant material for abrasive wear conditions, wear-resistant steel is widely used in metallurgy, mining, building materials, electric power, railways, and military fields. It is currently one of the most important steel types in my country's construction machinery industry. According to statistics, in industrially developed countries, the economic losses caused by the wear of mechanical equipment and parts account for about 4% of the total national economic output; my country consumes about 2 million tons of steel due to abrasive wear every year, causing economic losses of about 40 billion yuan. RMB. Therefore, strengthening the development and application of high-strength wear-resistant steel is of great significance to the development of the national economy. Due t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/02G01N1/32G01N1/34
Inventor 周千学官计生黄海娥严翔尹云洋朱丛茂杨治争何亚元杨志婷
Owner 武钢集团有限公司
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