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Method for testing creep property of metal

A technology of metal creep and test method, applied in the direction of measuring device, strength characteristics, instrument, etc., can solve the problems of long test time and many samples used for creep performance test, and achieve short test time, simple test process, and metal creep. Variable performance and efficient effects

Pending Publication Date: 2021-04-13
NINGXIA UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the embodiment of the present application is to provide a method for testing the creep performance of metals to solve the problems of using too many samples and long testing time for the creep performance test

Method used

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  • Method for testing creep property of metal
  • Method for testing creep property of metal
  • Method for testing creep property of metal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063]

[0064] (1) Pass the 4mm×4mm×25mm semi-solid cast A365 (SSM-A365-T6) aluminum alloy sample after T6 heat treatment through the fixture, and fix it in the sample chamber of the creep deformation variable testing equipment, and place the temperature sensor in turn Align the upper, middle and lower positions of the sample;

[0065] (2) The height of the creep deformation variable testing equipment is adjusted to 500mm, and a creep variable measurement test rod with a length of 200mm is selected;

[0066] (3) Heat the sample to 25°C;

[0067] (4) Load 5% of the yield stress (360MPa) on the sample, that is, 18MPa, and then increase 18MPa every 1h until the sample breaks;

[0068] During the stress loading process, the load cell is used to transmit the stress values ​​corresponding to different time intervals to the computer; the linear variable differential transformer is used to transmit the strain values ​​under different stresses and at the same time interval to the c...

Embodiment 2

[0072]

[0073] (1) except that the sample to be tested is the A365 (A365-T6) aluminum alloy after T6 heat treatment, all the other are identical with embodiment 1;

[0074] (2)-(3) are identical with embodiment 1;

[0075] (4) except that the yield stress (350MPa) of 5% is loaded to the sample, i.e. 17.5MPa, then, every 1h increases except that 17.5MPa, all the other are identical with embodiment 1;

[0076] (5) Same as Example 1.

[0077] Among them, the obtained creep curve is as figure 2 Shown; minimum creep rate-creep stress logarithmic graph as image 3 shown.

Embodiment 3

[0079]

[0080] (1)-(2) are identical with embodiment 1;

[0081] (3) Heat the sample to 220°C;

[0082] (4) except that the yield stress (290MPa) of 5% is loaded on the sample, i.e. 14.5MPa, then, every 1h increases except that 14.5MPa, all the other are identical with embodiment 1;

[0083] (5) Same as Example 1.

[0084] Among them, the obtained creep curve is as Figure 4 Shown; minimum creep rate-creep stress logarithmic graph as Figure 10 shown.

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Abstract

The invention provides a method for testing the creep property of metal. The method comprises the following steps: after loading initial axial stress to a sample, sequentially increasing the axial stress which is the same as the initial axial stress at the same time interval until the sample is broken; then, collecting stress and strain data in real time through a weighing sensor and a linear variable differential transformer, transmitting the data to a computer, processing the data through software, and drawing a creep curve of the sample; obtaining the minimum creep rate by utilizing the obtained creep curve, and drawing a minimum creep rate creep stress logarithm diagram according to a power law formula to obtain a creep index. According to the test method provided by the invention, the problems of more samples and long test time used for testing the metal creep property can be solved.

Description

technical field [0001] The present application relates to the technical field of metal performance testing, in particular to a method for testing metal creep performance. Background technique [0002] "Creep" refers to the ability of a material to resist deformation or failure under load for prolonged periods of time at relatively high temperatures. In actual production applications, some metal materials need to be used for a long time at room temperature or relatively high temperature, under fixed or no fixed load, and the creep behavior is very important for the long-term stable work of metal materials. Therefore, it is clear that metal materials in different The working life under pressure and temperature can avoid excessive creep or creep failure. [0003] At present, the test of metal creep performance is mainly to measure the creep index of metal under different pressure and temperature. The traditional method needs to use multiple samples to test the creep index, an...

Claims

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Application Information

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IPC IPC(8): G01N3/00
CPCG01N3/00G01N2203/0003G01N2203/0067G01N2203/0071G01N2203/0676
Inventor 史可人姚惠琴康盆伟薛平
Owner NINGXIA UNIVERSITY
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