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Test method for maximum dimensions of non-metallic inclusions in steel-iron material

A technology for non-metallic inclusions and steel materials, applied in the field of testing the largest non-metallic inclusion size, can solve the problems of destroying non-metallic inclusions, affecting the accuracy and reliability of test results, and achieving accurate test results and fast test speed. , the effect of improving accuracy and reliability

Active Publication Date: 2014-08-27
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

The problem is that the acidic electrolytic aqueous solution will destroy many non-metallic inclusions in steel, thus affecting the accuracy and reliability of its detection results

Method used

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  • Test method for maximum dimensions of non-metallic inclusions in steel-iron material
  • Test method for maximum dimensions of non-metallic inclusions in steel-iron material

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Embodiment 1

[0024] A specific embodiment of the present invention is a method for testing the size of the largest non-metallic inclusions in iron and steel materials, the specific method of which is:

[0025] a. Cut the sample blank: cut the sample blank from the steel structure to be tested;

[0026] b. Heat treatment: Quenching and tempering the sample blank, so that the hardness of the sample blank is 45-50HRC;

[0027] c. Making the sample: According to the composition of the sample blank, process the sample blank into an hourglass-shaped sample; and the size of the sample makes the natural frequency of the sample equal to the working frequency of the ultrasonic fatigue testing machine;

[0028] d. Surface strengthening treatment: The surface of the sample obtained in step c is subjected to shot blasting treatment, so that the depth of the hardened layer on the surface of the sample reaches 0.2mm;

[0029] e. Ultrasonic test: carry out the fatigue test on the sample on the ultrasonic...

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Abstract

The invention discloses a test method for the maximum dimensions of non-metallic inclusions in a steel-iron material. The test method comprises the following steps: a, cutting a specimen blank, namely cutting the specimen blank from the steel-iron material needing to be tested; b, carrying out heat treatment, namely carrying out quenching and tempering treatment on the specimen blank to enable the hardness of the specimen blank to be 45-50 HRC; c, producing a specimen, namely processing and producing the specimen blank into the specimen with a hourglass shape according to the ingredients of the specimen blank, wherein the inherent frequency of the specimen is equal to the working frequency of an ultrasonic fatigue testing machine due to the dimensions of the specimen; d, carrying out surface reinforcing treatment, namely carrying out shot-blasting treatment on the surface of the specimen obtained in the step c to enable the hardened-layer depth of the surface layer of the specimen to achieve 0.2mm; e, carrying out an ultrasonic test, namely carrying out a fatigue test on the specimen on an ultrasonic fatigue tester; and f, measuring the dimensions of inclusions, namely observing the fracture of the specimen after the ultrasonic test, and measuring the dimensions of the non-metallic inclusions on the fracture of the specimen. The maximum dimensions of the non-metallic inclusions, which are measured by adopting the method, are relatively accurate and reliable.

Description

technical field [0001] The invention relates to a method for testing the maximum size of non-metallic inclusions in iron and steel materials. Background technique [0002] With the development of high-speed, high-efficiency and light-weight mechanical equipment, high-strength materials are required. Materials such as high-strength steel, surface-treated steel, and cast iron with high strength (including fatigue strength) are widely used in mechanical structures. At present, railway axles and wheel rails, marine structures, bridges, engine parts, bearings of mechanical equipment, etc., are required to withstand 10 9 ~10 10 alternate loads without failure. However, during the smelting process of these high-strength iron and steel materials, slag, refractory materials and reaction products in smelting will all enter the molten steel and form non-metallic inclusions. Due to the existence of non-metallic inclusions, high-strength steel materials can withstand alternating load...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/20G01N29/04G01N1/28
Inventor 张继旺鲁连涛宋青鹏张宁曾东方张远彬
Owner SOUTHWEST JIAOTONG UNIV
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