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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 low-cost testing, high-strength steel strength and fracture toughness testing problems, and workload Reduce problems such as easy to judge the rationality of the results, simplify the processing of test pieces and test loading equipment, and reduce the difficulty

Active Publication Date: 2018-10-23
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

Method used

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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: Using low-alloy high-strength steel to make a unilateral tensile test piece, the size of the test piece is W=40mm, B=10mm, L=60mm, the height of the arc segment 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, each group made 5 test pieces, a total of 35 test pieces.

[0045]Carry out uniform loading at the rate specified in the "Tensile Test of Metal Materials Part 1: Test Method at Room Temperature" (GB / T 228.1-2010) and other specifications, until the specimen breaks and fails. The yield load of each specimen shall be recorded during the test. Before yielding of the test specimen of the embodiment, continuous pictures can be taken with a camera 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 specimen is 1mm-2mm.

[0046] For tensile testing machines or universal tes...

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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 the yield strength and fracture toughness of low-alloy high-strength steel. Background technique [0002] At present, in the current performance testing specifications of metal materials at home and abroad, for the determination of the fracture toughness of metal materials, the size of the test specimen is strictly regulated, and the crack length of the 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 K of Metallic Materials" IC Test Methods" (GB / T4161-2007), National Standard of the People's Republic of China - "Unified Test Methods for Quasi-Static Fracture Toughness of Metallic Materials" (GB / T 21143-2007), American ASTM E399 specification, European BS ...

Claims

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Application Information

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Patent Type & Authority Patents(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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