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Drawing method of temper brittleness curve

A technology of tempering brittleness and curves, which is applied in the direction of strength characteristics, measuring devices, instruments, etc., can solve the problems of drawing curves such as large randomness, poor accuracy, and difficulty in using them as evaluation indicators, and achieve the effect of improving the drawing speed

Inactive Publication Date: 2011-12-14
中国石油天然气第七建设有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the temper brittleness curve is generally drawn by hand, which has the defects of large randomness, poor accuracy, and difficulty in being used as an evaluation index.

Method used

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  • Drawing method of temper brittleness curve
  • Drawing method of temper brittleness curve
  • Drawing method of temper brittleness curve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The present invention relates to a kind of drawing method of temper brittleness curve, and this method comprises the following steps:

[0023] First, step cooling test data, that is, temper brittle transition temperature test data, is obtained through experiments.

[0024] In order to obtain the step-cooling test data similar to the material in the daily working environment, it is necessary to simulate the daily working environment and some extreme working environments where the test material is located. Therefore, the present invention selects two test panels and tests the two test panels respectively. And record the test data. For the first test panel, first, carry out minimum heat treatment, then, conduct Charpy impact test on the test plate and record the test data; for the second test plate, first, carry out minimum heat treatment, second step, carry out step Cooling test, the third step, after the test plate is air-cooled to room temperature through the step cool...

Embodiment 2

[0035] In this embodiment, when the Charpy impact test is carried out on the material, the test plate is subjected to the Charpy impact test three times under eight different temperature conditions, and the eight different temperatures are respectively -90°C and -70°C , -50°C, -30°C, -10°C, 10°C, 30°C, 50°C, record the test data of the Charpy impact test at eight different temperatures, so as to obtain the step cooling test data.

[0036] The eight temperature values ​​of the Charpy impact test can also be other values, but must include -30 ℃, and the rest of the test temperature should be selected appropriately. When selecting the test temperature, the temperature transition curve generated should clearly show the transition area and the upper platform and the lower platform, and there must be at least two test temperature points for each of the upper and lower platforms, and at least four test temperature points in the middle.

[0037] Others are with embodiment 1.

Embodiment 3

[0039] In this embodiment, when the Charpy impact test is carried out on the material, the test plate is subjected to the Charpy impact test three times under eight different temperature conditions, and the eight different temperatures are -85°C and -75°C respectively. , -55°C, -30°C, -15°C, 5°C, 25°C, 45°C, record the test data of the Charpy impact test at eight different temperatures, so as to obtain the step cooling test data.

[0040] Others are with embodiment 1.

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Abstract

The invention relates to the field of temper brittleness curves, in particular to a drawing method of temper brittleness curves. The method comprises the following steps: (1) obtain step cooling test data, that is, temper brittleness transition temperature test data by test: (2) process step cooling test data: (3) fit the temper brittleness curve: (4) ) to draw the temper brittleness curve. The temper brittleness curve drawn by this method has high precision and is very suitable for evaluation indicators.

Description

technical field [0001] The invention relates to the field of temper brittleness curves, in particular to a drawing method of temper brittleness curves. Background technique [0002] For materials that undergo temper embrittlement, such as iron-based materials, due to the decrease in toughness, the transition temperature under a certain impact energy or the increase in the fracture transition temperature can be used to quantitatively evaluate the degree of temper embrittlement, which requires drawing a temper embrittlement curve . At present, the temper brittleness curve is generally drawn by hand. This method has the defects of large randomness, poor accuracy, and difficulty in being used as an evaluation index. Contents of the invention [0003] The object of the present invention is to propose a method for drawing a temper brittleness curve. The temper brittleness curve drawn by this method has high precision and is very suitable for use as an evaluation index. [0004...

Claims

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Application Information

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IPC IPC(8): G01N3/303
Inventor 李梦贤杨建明孔凡富崔义新代学彦张龙仿任林昌张立东师娟周涛李新宇
Owner 中国石油天然气第七建设有限公司
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