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Obtaining method of austenite stainless steel constitutive curve considering room temperature creeping

A technology of austenitic stainless steel and obtaining method, which is applied in the direction of applying stable tension/pressure to test the strength of materials, measuring devices, instruments, etc., which can solve the problems of not considering the effect of room temperature creep and the calculation results not including room temperature creep and other problems , to achieve the effect of improving prediction accuracy and accurate prediction results

Active Publication Date: 2018-02-23
ZHEJIANG UNIV
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Problems solved by technology

However, the constitutive curves currently used for these predictions do not take into account the effect of room temperature creep, so the calculation results do not include room temperature creep

Method used

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  • Obtaining method of austenite stainless steel constitutive curve considering room temperature creeping
  • Obtaining method of austenite stainless steel constitutive curve considering room temperature creeping
  • Obtaining method of austenite stainless steel constitutive curve considering room temperature creeping

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Embodiment Construction

[0017] Below in conjunction with specific examples, the method for obtaining the constitutive curve of austenitic stainless steel considering room temperature creep is further described in the present invention:

[0018] (1) Obtain the original data for constructing the constitutive curve through the tensile load test of austenitic stainless steel materials:

[0019] Take the austenitic stainless steel to be processed as a sample, and carry out a room temperature tensile test according to the standard GB / T 228.1-2010 "Metallic Materials Tensile Test Part 1: Room Temperature Test Method"; the test process is controlled by force, at the same rate After stretching the sample to the set stress σ, the load is maintained, and the holding time T(σ) is calculated by the following formula:

[0020]

[0021] In the above formula: It is aimed at artificially setting the expected strain rate at the end of room temperature creep, that is, when the strain rate is less than or equal to ...

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Abstract

The present invention relates to an austenite stainless steel processing technology. A purpose of the present invention is to provide an obtaining method of an austenite stainless steel constitutive curve considering room temperature creeping. The method comprises: obtaining the original data for constructing a constitutive curve through the tension load retention test of an austenite stainless steel material; and labeling points ([sigma]1, [epsilon]1), ([sigma]2, [epsilon]2), ..., ([sigma]n, [epsilon]n) respectively by using set stress [sigma] as horizontal ordinates and using the total strain [epsilon] as vertical coordinates, and establishing an [epsilon] change curve related to the stress [sigma] through fitting, wherein the curve is the austenite stainless steel constitutive curve considering the influence caused by room temperature creeping. Compared to the obtaining method in the prior art, the obtaining method of the present invention considers the influence of the room temperature creeping on the constitutive curve. According to the present invention, by defining the data determination method, the time calculation formula and the like, the prediction precision can be significantly improved and the prediction result is accurate when the finally-obtained constitutive curve is used in the stress-strain response theoretical calculation and simulation prediction of the austenite stainless steel material or structure in the late-stage.

Description

technical field [0001] The invention relates to the constitutive curve of austenitic stainless steel, in particular to a method for obtaining the constitutive curve of austenitic stainless steel considering room temperature creep. Background technique [0002] Austenitic stainless steel has obvious room temperature creep characteristics, that is, at room temperature, when the material is subjected to a stable stress higher than the yield strength for a long time, it will undergo more obvious room temperature creep, such as in austenitic stainless steel In the strain strengthening process of the strain-strengthened cryogenic vessel, the material is preserved under the strengthened pressure for more than 1 hour, and room temperature creep will appear during the preservation process, and the entire structure will gradually expand, and the final creep value can reach 1 %~2%. [0003] The current room temperature constitutive curve of austenitic stainless steel is a constitutive...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08
CPCG01N3/08G01N2203/0003G01N2203/0017G01N2203/0071
Inventor 郑津洋晓风清丁会明陆群杰
Owner ZHEJIANG UNIV
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