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A method for measuring the magnetic field intensity of martensitic transformation induced in steel at constant temperature

A technology of martensitic phase transformation and magnetic field strength, applied in the direction of the size/direction of the magnetic field, magnetic performance measurement, etc., can solve the problem that the constant temperature is difficult to control accurately

Inactive Publication Date: 2015-08-19
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The highest magnetic field that a traditional electromagnet can generate is less than 3 T (Tesla), and the maximum applicable magnetic field can only reach about 1 T due to the need to add a test sample fixture, that is, a sample rod, etc. during actual measurement; ( 2) It is difficult to accurately control the constant temperature during measurement

Method used

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  • A method for measuring the magnetic field intensity of martensitic transformation induced in steel at constant temperature
  • A method for measuring the magnetic field intensity of martensitic transformation induced in steel at constant temperature
  • A method for measuring the magnetic field intensity of martensitic transformation induced in steel at constant temperature

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Experimental program
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Embodiment 1

[0027] This embodiment includes the following steps:

[0028] (1) Pretreatment of steel

[0029] 15.5Cr-4.8Mo-8.2Co-3.1Ni low carbon steel was selected, and after vacuum melting treatment in the early stage, it was cast into a 100 kg material ingot, and high temperature forged into a bar with a diameter of about 22 mm. Cut the bar stock into cylindrical samples with a diameter of 20mm and a length of 15mm. The quenching temperature of the cylindrical sample was 1 080 ℃, and the holding time was 40 min. The quenched low-carbon steel cylinder sample was cut into block samples with a diameter of 3 mm and a length of 3 mm by electric discharge method.

[0030] (2) Magnetic test

[0031] Install the vibrating sample magnetometer on the comprehensive physical property measurement system, and conduct a magnetic test on the above-mentioned samples. The form of the magnetic test is constant temperature M-H curve (hysteresis loop).

[0032] Test conditions: constant temperature (30...

Embodiment 2

[0040] (1) Pretreatment of steel

[0041] Select 15.5Cr-4.8Mo-8.2Co-3.1Ni low carbon steel, after the vacuum melting treatment in the early stage, cast it into 100 kg material ingot, and forge it into a bar with a diameter of about 22 mm at high temperature. Cut the bar into a cylindrical sample with a diameter of 20mm and a length of about 15mm. The quenching temperature of the cylindrical sample was 1060 °C, and the holding time was 40 min. The quenched low-carbon steel cylinder sample was cut into block samples with a diameter of 3 mm and a length of 3 mm by electric discharge method.

[0042] (2) Magnetic test

[0043] Install the vibrating sample magnetometer on the comprehensive physical property measurement system, and conduct a magnetic test on the sample. The form of the magnetic test is constant temperature M-H curve (magnetization curve).

[0044] Test conditions: constant temperature (300K); maximum external magnetic field strength: 50 000 Oe; changing field ra...

Embodiment 3

[0049] (1) Pretreatment of steel

[0050] 15.5Cr-4.8Mo-8.2Co-3.1Ni low carbon steel was selected, and after vacuum melting treatment in the early stage, it was cast into a 100 kg material ingot, and high temperature forged into a bar with a diameter of about 22 mm. Cut the bar into a cylindrical sample with a diameter of 20mm and a length of about 15mm. The quenching temperature of the cylindrical sample was 1040 °C, and the holding time was 40 min. The quenched low-carbon steel cylinder sample was cut into block samples with a diameter of 3 mm and a length of 3 mm by electric discharge method.

[0051] (2) Magnetic test

[0052] Install the vibrating sample magnetometer on the comprehensive physical property measurement system, and conduct a magnetic test on the sample. The form of the magnetic test is constant temperature M-H curve (magnetization curve).

[0053] Test conditions: constant temperature (300K); maximum external magnetic field strength: 50 000 Oe; changing f...

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Abstract

The invention relates to a measuring method for intensity of a magnetic field for inducing martensite phase transformation in steel under constant temperature. The measuring method comprises the steps of performing magnetism testing on a sample on a vibrating sample magnetometer of a comprehensive physical property measurement system after cutting the quenched steel sample into suitable sizes, drawing a hysteresis loop or magnetization curve of the sample under the constant temperature, observing and analyzing the measured hysteresis loop or magnetization curve, and determining intensity values of the magnetic field for inducing the martensite phase transformation under different testing conditions. The measuring method has direct guiding significance for determining a magnetic field processing process of quenched steel or using conditions under the magnetic field and can help accurately control structure forming and performance of the steel, and application potential of the steel is excavated.

Description

technical field [0001] The invention relates to a method for measuring the magnetic field parameters required for the phase transformation induced by the magnetic field of the unstable phase in iron and steel materials at a constant temperature, in particular to a method for measuring the magnetic field intensity of the martensitic phase transformation induced by the magnetic field of the residual austenite in the steel at a constant temperature method. Background technique [0002] After the quenching treatment of iron and steel materials, in addition to martensite, the structure often contains a certain amount of retained austenite. If it is subjected to an external strong magnetic field or treated with a strong magnetic field at a specified temperature, the retained austenite will Martensite is transformed into martensite. Retained austenite is an unstable phase. Its stability has an important influence on the internal structure and macroscopic shape of the steel. Therefo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R33/02G01R33/12
Inventor 孙世清
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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