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Method for carrying out in-situ measurement on precipitation amount of Fe3C in low-carbon alloy steel

A low-carbon alloy steel, in-situ measurement technology, used in measurement devices, analytical materials, material thermal analysis and other directions, can solve problems such as strength reduction, and achieve the effects of strong applicability, wide application prospects, and high test accuracy

Active Publication Date: 2018-09-14
CHANGZHOU DONGFANG SPECIAL STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the intensity of the SKK peak increases with the Fe 3 C precipitation increases and decreases

Method used

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  • Method for carrying out in-situ measurement on precipitation amount of Fe3C in low-carbon alloy steel
  • Method for carrying out in-situ measurement on precipitation amount of Fe3C in low-carbon alloy steel
  • Method for carrying out in-situ measurement on precipitation amount of Fe3C in low-carbon alloy steel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1: concrete steps are as follows:

[0031] (1) The low-carbon alloy steel sample to be tested is processed into a cuboid with a specification of 80×10×5mm, which is subjected to a high-temperature solution treatment at 910°C, kept for 120 minutes and then quenched in water, and the steel sample after the high-temperature solution treatment is processed into a 2-3 internal friction test samples with a specification of 1.5×2.5×65mm, the surface is polished with 100#—200#—400#—600#—800# sandpaper in sequence, and then polished to make the surface smooth.

[0032] (2) Install one of the above-mentioned internal friction test samples on the MFP-1000 internal friction tester. After pumping a high vacuum, the temperature is rapidly raised from room temperature to 350°C at a heating rate of 30°C / min. After reaching 350°C, the temperature is lowered immediately, and the temperature is lowered during the test. For the SKK peak in the process, the cooling rate is 2°C / mi...

Embodiment 2

[0037] Embodiment 2: concrete steps are as follows:

[0038] (1) The low-carbon alloy steel sample to be tested is processed into a cuboid with a specification of 80×10×5mm, which is subjected to a high-temperature solution treatment at 910°C, kept for 120 minutes and then water-quenched. All the C atoms in the steel sample are solid-solved Exists in the form of Fe-free 3 C precipitation; the steel sample after high temperature solution treatment is processed into 2-3 internal friction test samples with a specification of 1.5×2.5×65mm, and the surface is polished with 100#—200#—400#—600#—800# sandpaper , and then polished to make the surface smooth.

[0039] (2) Install one of the above-mentioned internal friction test samples on the MFP-1000 internal friction instrument. After pumping a high vacuum, the temperature is rapidly raised from room temperature to 350°C, and the heating rate is 30°C / min. After reaching 350°C, the temperature is immediately lowered, and the temperat...

Embodiment 3

[0043] Embodiment 3: concrete steps are as follows:

[0044] (1) The low-carbon alloy steel sample to be tested is processed into a cuboid with a specification of 80×10×5mm, subjected to high-temperature solution treatment at 930°C, and water quenched after 120 minutes of heat preservation. The C atoms in the steel sample are all in solid solution Exists in the form of Fe-free 3 C precipitation, the steel sample after high temperature solid solution treatment is processed into 2-3 internal friction test samples with a specification of 1.5×2.5×65mm, and the surface is polished with 100#—200#—400#—600#—800# sandpaper , and then polished to make the surface smooth.

[0045] (2) Install one of the above-mentioned internal friction test samples on the MFP-1000 internal friction instrument. After pumping a high vacuum, the temperature is rapidly raised from room temperature to 350°C, and the heating rate is 30°C / min. After reaching 350°C, the temperature is immediately lowered, and...

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Abstract

The invention provides a method for carrying out in-situ measurement on precipitation amount of Fe3C in low-carbon alloy steel, belonging to the technical field of metal material testing. The method comprises the steps of firstly, processing a solid solution-treated low-carbon alloy steel sample to be tested into a steel internal friction test sample, and then installing the internal friction testsample in internal friction test equipment; rapidly heating up to 350 DEG C from room temperature and then immediately cooling down, and measuring an SKK peak in the process of cooling to room temperature; in the third step, measuring the SKK peak, subjected to the heat treatment, of the solid solution-treated steel internal test sample; after that, cooling the internal friction test sample, which is obtained in the third step and is subjected to heat treatment, to the room temperature and then rapidly heating up to a target temperature T0, carrying out heat preservation for a period of timet2, and measuring the SKK peak in the process of cooling to the room temperature from 350 DEG C; treating the internal friction curves, obtained from the measurement at different temperature preservation time, of the sample by repeating the process of step 4, determining the precipitation amount of the Fe3C according to the strength of the SKK peak so as to obtain the dynamic characteristic of theprecipitation of the carbide Fe3C. The method provided by the invention is simple to operate, easy in sample preparation, high in measurement accuracy and rapid in speed.

Description

Technical field: [0001] The invention belongs to the technical field of metal material testing, in particular to an in-situ measurement of Fe in low-carbon alloy steel 3 C precipitation method. Background technique: [0002] Carbon (C) element is one of the most important alloying elements in steel. C atoms are easy to form cementite Fe in steel 3 C, the carbide is one of the most important constituent phases in the steel structure, and its quantity, shape and distribution have a direct impact on the properties of the steel material. Therefore, whether C atoms can be fully analyzed when formulating the tempering process for steel materials is also a problem that needs to be considered first. Accurately measure Fe in steel 3 The amount of C precipitation is the theoretical basis for formulating a reasonable heat treatment process. [0003] In current technology, Fe in steel 3 The methods used to detect the amount of C precipitation generally include metallographic method...

Claims

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Application Information

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IPC IPC(8): G01N25/00
CPCG01N25/00
Inventor 周红伟唐明星李家琪叶昕周佩剑司聪郭忠亮何宜柱
Owner CHANGZHOU DONGFANG SPECIAL STEEL
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