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Method for evaluating hydrogen-induced delayed fracture resistance of ultrahigh-strength automobile steel plate

An automotive steel plate and ultra-high-strength technology, applied in the direction of strength characteristics, using stable tension/pressure testing material strength, measuring devices, etc., can solve the problems of long cycle, large equipment constraints, limited promotion and application, etc., to achieve operation Simple, long test period, easy to popularize and apply

Pending Publication Date: 2021-10-29
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, for many parts with complex shapes, the existing evaluation methods such as slow strain rate tension, constant load and U-shaped curved beam have certain limitations in the evaluation of the hydrogen-induced delayed fracture resistance of the plate.
In addition, these methods often have problems such as complex test operation, long cycle, and large equipment constraints, which limit their promotion and application in the automotive industry.

Method used

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  • Method for evaluating hydrogen-induced delayed fracture resistance of ultrahigh-strength automobile steel plate
  • Method for evaluating hydrogen-induced delayed fracture resistance of ultrahigh-strength automobile steel plate
  • Method for evaluating hydrogen-induced delayed fracture resistance of ultrahigh-strength automobile steel plate

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Experimental program
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Effect test

Embodiment 1

[0138] In embodiment 1, (D' 0 ) 3 =80.00mm, 3 samples in this group were broken, and 3 samples were not broken.

[0139] (D 0 ) max =(D' 0 ) 3 =80.00mm

[0140]

[0141] The hydrogen-induced delayed fracture test condition and test result of table 3 embodiment 2

[0142]

[0143] It can be seen from the data in Table 3 that:

Embodiment 2

[0144] In embodiment 2, (D " 0 ) 3 =73.75mm, X=2;

[0145] (D' 0 ) 4 =75.00mm, Y=5, Z=1.

[0146]

[0147]

[0148] The hydrogen-induced delayed fracture test condition and test result of table 4 embodiment 3

[0149]

[0150]

[0151] It can be seen from the data in Table 4 that:

Embodiment 3

[0152] In embodiment 3, (D' 0 ) 3 =72.50mm, 4 samples in this group were broken, and 4 samples were not broken.

[0153] (D 0 ) max =(D' 0 ) 3 =72.50mm

[0154]

[0155] The hydrogen-induced delayed fracture test condition and test result of table 5 embodiment 4

[0156]

[0157] It can be seen from the data in Table 5 that:

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Abstract

The invention relates to the technical field of material performance detection, in particular to a method for evaluating hydrogen-induced delayed fracture resistance of an ultrahigh-strength automobile steel plate. According to the method, disc-shaped samples are adopted; drawing forming is conducted on the samples to obtain cup-shaped samples with different drawing ratios; the cup-shaped samples with different drawing ratios are placed in a hydrogen filling medium, and soaked for the upper limit time; the number of fractured samples and the number of unfractured samples in each diameter group are observed and recorded; the maximum sample diameter (D0) max allowed to be adopted is determined when the sample is not broken; the critical drawing ratio LDRHIC of the material is calculated; and the LDRHIC is used as an evaluation index of the hydrogen-induced delayed fracture resistance of the material, the larger the LDRHIC is, the stronger the hydrogen-induced delayed fracture resistance of the material is, and the more difficult the hydrogen-induced delayed fracture of the material is. According to the invention, the hydrogen-induced delayed fracture behavior of the ultra-high-strength automobile steel part with the complex shape under the actual forming condition and the service condition can be better simulated, and the hydrogen-induced delayed fracture resistance of the material can be simply, effectively and accurately evaluated by taking the critical drawing ratio LDRHIC as an index.

Description

technical field [0001] The invention relates to the technical field of material performance detection, in particular to a method for evaluating the hydrogen-induced delayed fracture resistance of an ultra-high-strength automobile steel plate. Background technique [0002] With the rapid development of my country's automobile industry, in order to meet the requirements of light weight, energy saving, emission reduction, consumption reduction, cost reduction and other development trends, automobile steel is constantly moving towards high strength. A large number of studies have shown that with the increase of strength, the risk of hydrogen-induced delayed fracture of automotive steel also increases, especially when the strength is higher than 1000MPa, the probability of hydrogen-induced delayed fracture of steel increases significantly. Hydrogen-induced delayed fracture is a phenomenon of sudden brittle failure of materials under static stress after a certain period of time, a...

Claims

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Application Information

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IPC IPC(8): G01N3/08G01N3/02G01N1/31
CPCG01N3/08G01N3/02G01N1/31G01N2203/0067
Inventor 张南刘仁东林利张瑞坤丁庶炜徐鑫陆晓锋苏洪英吕冬李萧彤
Owner ANGANG STEEL CO LTD
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