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Method for testing hydrogen-induced delayed fracture performance of ultrahigh-strength automobile steel plate

A technology for delayed fracture of ultra-high-strength steel, which is applied in the field of hydrogen-induced delayed fracture performance testing of ultra-high-strength automotive steel plates, can solve problems such as unfavorable industry promotion, and achieve the effects of improved stamping stress distribution and strong practicability

Pending Publication Date: 2020-06-19
CHINA AUTOMOTIVE ENG RES INST
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Problems solved by technology

[0006] The invention provides a method for testing the hydrogen-induced delayed fracture performance of ultra-high-strength automobile steel plates to solve many problems that are not conducive to industry promotion in the current hydrogen-induced delayed fracture test method

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  • Method for testing hydrogen-induced delayed fracture performance of ultrahigh-strength automobile steel plate
  • Method for testing hydrogen-induced delayed fracture performance of ultrahigh-strength automobile steel plate
  • Method for testing hydrogen-induced delayed fracture performance of ultrahigh-strength automobile steel plate

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Embodiment Construction

[0039] In order to enable those skilled in the art to better understand the technical solutions in the embodiments of the present invention, and to make the above-mentioned purposes, features and advantages of the embodiments of the present invention more obvious and understandable, the following describes the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings For further detailed explanation.

[0040] In the description of the present invention, unless otherwise specified and limited, it should be noted that the term "connection" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, or it can be the internal communication of two elements, it can be Directly connected or indirectly connected through an intermediary, those skilled in the art can understand the specific meanings of the above terms according to specific situations.

[0041] see figure 1 , is a ...

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Abstract

The invention provides a method for testing hydrogen-induced delayed fracture performance of an ultrahigh-strength automobile steel plate, which comprises the following steps of: preparing a pluralityof groups of samples for ultrahigh-strength steel to be tested; carrying out a quasi-static tensile test on the samples to obtain engineering stress-strain curve data of the samples; searching required dependent variables corresponding to the required bending stress of each group of the samples from the engineering stress-strain curve data; as for samples in each group, clamping the test sampleson corresponding bending tool clamps and loading bending stress to the samples; measuring the dependent variables of the minimum bending radius parts of the samples by using a non-contact optical measurement system DIC, stopping loading bending stress to the samples when the dependent variable measured by the DIC reaches the required dependent variable, and fastening the sample by using the bending tool clamp to realize the pre-bending of the samples; and putting each group of pre-bent samples and the bending tool clamp thereof into a hydrogen-induced delayed fracture performance test solution, and monitoring the cracking condition of the samples.

Description

technical field [0001] The invention belongs to the field of performance testing of steel materials, in particular to a method for testing the hydrogen-induced delayed fracture performance of an ultra-high-strength automobile steel plate. Background technique [0002] With the rapid development of the domestic automobile industry, energy-saving and new energy vehicles are becoming new growth areas in the automobile market, and lightweight is a key technology to promote the development goal of automobile energy conservation and emission reduction. Ultra-high-strength steel plate has become an important material for automobile body manufacturing because it can reduce the weight of automobiles while ensuring safety. When the tensile strength of the steel plate is higher than 1000 MPa, the susceptibility to hydrogen-induced delayed fracture increases significantly, which is the main factor restricting the wide application of ultra-high-strength automotive steel plates. The test...

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Application Information

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IPC IPC(8): G01N3/20G01N3/04G01N3/06G01N1/28
CPCG01N1/28G01N1/286G01N3/04G01N3/068G01N3/20G01N2001/2873G01N2001/2886G01N2203/0067G01N2203/0236G01N2203/0282G01N2203/0647G01N2203/0682
Inventor 赵岩冯毅周佳马鸣图万鑫铭路洪洲方刚张钧萍李珮铭范体强梁宾孙岱阎换丽陈杨东
Owner CHINA AUTOMOTIVE ENG RES INST
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