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Method for simultaneous determination of yield strength and fracture toughness of low-alloy high-strength steel

A low-alloy high-strength, yield strength technology, applied in the direction of applying stable tension/pressure to test material strength, strength characteristics, measuring devices, etc., can solve the problem of low test cost, reduced workload, high-strength steel strength and fracture toughness test It is easy to judge the rationality of the results, reduce the difficulty, simplify the test piece processing and test loading equipment

Active Publication Date: 2016-09-28
NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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Problems solved by technology

[0007] In order to overcome the deficiencies of the existing measurement methods, the present invention proposes a test method for determining the yield strength and fracture toughness of high-strength steel from small-sized test pieces, which solves the current high-strength steel strength and fracture toughness test problems, and its test conditions are relaxed, Significantly reduced workload and low cost of testing

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  • Method for simultaneous determination of yield strength and fracture toughness of low-alloy high-strength steel
  • Method for simultaneous determination of yield strength and fracture toughness of low-alloy high-strength steel
  • Method for simultaneous determination of yield strength and fracture toughness of low-alloy high-strength steel

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Embodiment 1

[0044] Example 1: Low-alloy high-strength steel is used to process and manufacture a unilateral tensile test piece. The size of the test piece is W=40mm, B=10mm, L=60mm, the height of the arc section is 20mm, and the size of the rectangular clamping end is: 70mm× 80mm. Make the seam height ratio as a 0 / W = 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7 7 groups of test pieces, 5 test pieces for each group, 35 test pieces in total.

[0045]According to "Metallic Materials Tensile Test Part 1: Room Temperature Test Method" (GB / T 228.1-2010) and other specifications, the uniform speed loading is carried out until the specimen is broken. The yield load of each specimen shall be recorded during the test. Before the yield of the test specimen in the embodiment, a camera can be used to take continuous pictures to capture the length of the yield zone at the tip of the crack. In this embodiment, the length of the yield zone of the test piece is 1mm-2mm.

[0046] For tensile testing machines or...

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Abstract

The invention discloses a method for simultaneous determination of yield strength and fracture toughness of low-alloy high-strength steel, wherein the method includes the steps of processing and preparing specimens by using the low-alloy high-strength steel, cutting to obtain cracks, loading the specimens according to a metal material tensile test method, calculating the yield load and the equivalent crack length of the specimens and the like, and finally, carrying out regression analysis to obtain the yield strength [sigma]Y and the fracture toughness KC of the low-alloy high-strength steel. The method is simple in form, has the test easy to operate, has sufficient accuracy and has the result rationality easy to judge. The method can simultaneously determine the yield strength and the fracture toughness of the high-strength steel only with the yield load tested by the tensile test of small-size one-way plates with different crack lengths, and does not need to meet strict stipulation of the current domestic and international norms on the test specimen size, type, loading conditions and the like.

Description

technical field [0001] The invention relates to the technical field of metal material performance detection, in particular to a method for simultaneously measuring yield strength and fracture toughness of low-alloy high-strength steel. Background technique [0002] At present, in the current domestic and foreign performance test specifications for metal materials, there are strict regulations on the size of the test specimen for the determination of the fracture toughness of metal materials, and the crack length of the test specimen is a 0 , specimen thickness B and ligament height W-a 0 must be greater than a certain value. For example, the National Standard of the People's Republic of China - "Plane Strain Fracture Toughness of Metal Materials K IC Test Method" (GB / T 4161-2007), National Standard of the People's Republic of China - "Unified Test Method for Quasi-Static Fracture Toughness of Metallic Materials" (GB / T 21143-2007), American ASTM E399 specification, European...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08
CPCG01N3/08G01N2203/0003G01N2203/0017G01N2203/0067
Inventor 管俊峰姚贤华胡晓智白卫峰周密卿龙邦谢超鹏王强韩霄羽
Owner NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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