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Calibration method for measuring retained austenite of steel grade by X-ray diffraction method

A technology of retained austenite and calibration method, applied in the field of non-destructive testing of bearing heat treatment, can solve problems such as equipment and calculation deviation, inability to obtain measurement results, etc., to meet user needs and facilitate technical support.

Active Publication Date: 2021-04-30
LUOYANG LYC BEARING
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0002] According to the principle of X-ray diffraction, the cumulative intensity of X-ray diffraction lines of a certain phase increases with the increase of the relative content of the phase in the sample, by measuring the cumulative intensity of the diffraction lines of the martensite phase and austenite phase of bearing steel Calculate the content of retained austenite in steel, but there are equipment and calculation deviations in the measurement process, generally between 1% and 2%; precision bearings, rolling mill bearings and wind power bearings have lower requirements for the content of retained austenite in steel , the general requirement is not more than 3%, and accurate measurement results cannot be obtained under this deviation. A calibration method is needed to correct the measurement results to accurately obtain the retained austenite content of the sample

Method used

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  • Calibration method for measuring retained austenite of steel grade by X-ray diffraction method

Examples

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Effect test

Embodiment 1

[0018] A calibration method for measuring retained austenite of steel type by X-ray diffraction method, comprising the following specific steps:

[0019] Step 1: Preparation of bearing steel 0# sample with zero residual austenite content; firstly, spheroidizing and annealing the high-carbon chromium bearing steel GCr15 or GCr15SiMn sample, first putting it into a heating furnace for heating, heating temperature: 780°C, Holding time: 6h; then open the furnace cover and quickly cool to 610°C; then heat up to 710°C with the furnace, holding time 2h; finally cool to 590°C out of the furnace;

[0020] Step 2: Obtain the zero position deviation value A of the measuring equipment; use X-ray diffraction equipment to detect the prepared 0# sample with zero retained austenite content, and use the obtained detection value A as the zero position deviation value;

[0021] Step 3: Use the same X-ray diffraction equipment to detect the sample to be tested. The material of the sample to be te...

Embodiment 2

[0023] The difference from Example 1 lies in Step 1:

[0024] Step 1: Preparation of bearing steel 0# sample with zero residual austenite content; spheroidizing and annealing the high-carbon chromium bearing steel GCr15 or GCr15SiMn sample, first put it into a heating furnace for heating, heating temperature: 790 ° C, keep warm Time: 6.5h; then open the furnace cover and quickly cool to 620°C; then heat up to 720°C with the furnace, holding time for 2.5h; finally cool to 600°C and leave the oven.

Embodiment 3

[0026] The difference from Example 1 lies in Step 1:

[0027] Step 1: Preparation of bearing steel 0# sample with zero residual austenite content; spheroidizing and annealing the high-carbon chromium bearing steel GCr15 or GCr15SiMn sample, first put it into a heating furnace for heating, heating temperature: 800 ° C, keep warm Time: 7h; then open the furnace cover and quickly cool to 630°C; then heat up to 730°C with the furnace, holding time for 3h; finally cool to 610°C and leave the oven.

[0028] Retained austenite content determined by X-ray diffraction method %

[0029]

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Abstract

The invention relates to the technical field of bearing heat treatment nondestructive testing, in particular to a calibration method for measuring retained austenite of steel grade through an X-ray diffraction method. The calibration method comprises the following specific steps of 1, preparing a bearing steel 0# sample with the retained austenite content being zero; 2, obtaining a zero deviation value A of the measurement equipment; using X-ray diffraction equipment for detecting the prepared 0# sample with the retained austenite content being zero, and an obtained detection value A serving as a zero deviation value; 3, detecting the to-be-detected sample by using the same X-ray diffraction equipment, wherein the retained austenite content Y of the to-be-detected sample is equal to the actual measured value B-the zero deviation value A. The calibration method can correct the retained austenite content measured by the X-ray diffraction method, so that the measurement result is more accurate.

Description

technical field [0001] The invention relates to the technical field of non-destructive testing of bearing heat treatment, in particular to a calibration method for measuring retained austenite of steel types by X-ray diffraction method. Background technique [0002] According to the principle of X-ray diffraction, the cumulative intensity of X-ray diffraction lines of a certain phase increases with the increase of the relative content of the phase in the sample, by measuring the cumulative intensity of the diffraction lines of the martensite phase and austenite phase of bearing steel Calculate the content of retained austenite in steel, but there are equipment and calculation deviations in the measurement process, generally between 1% and 2%; precision bearings, rolling mill bearings and wind power bearings have lower requirements for the content of retained austenite in steel , generally requires no more than 3%, and accurate measurement results cannot be obtained under thi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/207
CPCG01N23/207G01N2223/056G01N2223/1016G01N2223/303G01N2223/624Y02P10/20
Inventor 尤绍军孙小东王红伟
Owner LUOYANG LYC BEARING