Method for qualitatively evaluating crack arrest toughness of steel plate by utilizing impact fracture microhardness distribution

A technology of microhardness and impact fracture, which is applied in the direction of testing material strength, strength characteristics, and testing material hardness by using one-time impact force, which can solve the problems of different microstructure deformations, etc. low effect

Active Publication Date: 2020-12-18
NORTHEASTERN UNIV +1
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Problems solved by technology

During the Charpy impact test, although the test specimens with different microstructures have the same detection results, the deformation of the microstructure near the impact fracture is not the same

Method used

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  • Method for qualitatively evaluating crack arrest toughness of steel plate by utilizing impact fracture microhardness distribution
  • Method for qualitatively evaluating crack arrest toughness of steel plate by utilizing impact fracture microhardness distribution
  • Method for qualitatively evaluating crack arrest toughness of steel plate by utilizing impact fracture microhardness distribution

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with specific examples, but the present invention is not limited in any way.

[0021] A method for qualitatively evaluating the crack arrest toughness of a steel plate by utilizing the microhardness distribution of impact fracture, the evaluation method comprising the following steps:

[0022] 1) The 1 / 2 position of the Kca steel plate with known and unknown crack arrest toughness is processed into a standard longitudinal impact specimen and subjected to a -60°C Charpy impact test. The impact fracture specimen is cut by wire cutting, and the cutting position is perpendicular to V At the 1 / 3 width of the mouth direction, the cutting depth is 10mm. The cutting surface is ground with different types of sandpaper and mechanically polished, and it is corroded with 4% nitric acid alcohol solution for 8 seconds before use.

[0023] 2) Measure the microhardness at different positions on the corrosion surface w...

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Abstract

The invention discloses a method for preliminarily evaluating the crack arrest toughness of a steel plate by utilizing impact fracture microhardness distribution. According to the method, the potential of the Charpy impact test is further excavated by taking the existing impact test as a detection means, and the approximate crack arrest toughness Kca of the undetected steel plate is preliminarilyevaluated by comparing the deformation conditions of the microstructure near the impact fracture of the steel plate without crack arrest toughness Kca detection and the known crack arrest toughness Kca steel plate; and a reference is provided for subsequent further inspection. According to the evaluation method, the crack arrest performance of the crack arrest steel plate can be rapidly judged, areference basis is provided for subsequent identification work, the operability is high, the implementation difficulty is small, and the crack arrest steel trial-production cost is remarkably reduced.

Description

technical field [0001] The invention relates to a method for qualitatively evaluating the crack arrest toughness of a steel plate by utilizing the microhardness distribution of the impact fracture, specifically by comparing it with the microhardness distribution of the steel plate fracture with known crack arrest toughness Kca, and preliminarily judging another steel plate with unknown crack arrest toughness Whether the crack arrest toughness meets the further testing standards provides a reference for whether the subsequent steel plates are tested in the next step. Background technique [0002] In recent years, with the increase in the efficiency of ocean transportation and the amount of material transported at sea, container ships have become large-scale, and the load on their deck superstructure is increasing, which seriously challenges the safety of ships. In order to ensure the safety of the container ship hull structure, generally Large-thickness and high-strength crac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/40G01N3/30
CPCG01N3/30G01N3/40G01N2203/001G01N2203/0076G01N2203/0228G01N2203/0282G01N2203/0298
Inventor 王红涛田勇叶其斌王斌王国栋邱保文赵晋斌
Owner NORTHEASTERN UNIV
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