9Ni steel fracture fiber rate judgment method

A determination method and fiber technology, applied in instruments, measuring devices, scientific instruments, etc., can solve problems such as the inability to apply 9Ni steel production practices, and achieve the effects of reducing the influence of human factors, high measurement accuracy, and improving accuracy.

Active Publication Date: 2020-05-12
ANGANG STEEL CO LTD
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Problems solved by technology

[0007] Zeng Jing’s paper "Discussion on the Relationship between Fracture Fiber Ratio and Microstructure of Pipeline Steel X70" used scanning electron microscopy to observe the fracture morphology of X70 pipeline steel, observed the fracture morphology of DWTT samples, and analyzed the reasons for the low fracture fiber ratio, but did not apply scanning electron microscopy. The electron microscope summed up the method of determining the fracture fiber ratio, which cannot be applied to the production practice of 9Ni steel

Method used

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  • 9Ni steel fracture fiber rate judgment method
  • 9Ni steel fracture fiber rate judgment method
  • 9Ni steel fracture fiber rate judgment method

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Experimental program
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Effect test

Embodiment 1

[0038] Using a scanning electron microscope to observe the impact fracture morphology of 9Ni steel with a manually determined fiber rate of 70%, the sample number is 7197-2-1, the impact sample size is 10×10×55mm, and the sample width b=10000μm; see figure 1 , the observed, analyzed and calculated crystallization area S=17191481.50μm 2 , then its fracture fiber rate is:

[0039] FA=[1-S / (a×b)]×100%=78.5%

Embodiment 2

[0041] Use a scanning electron microscope to observe the impact fracture morphology of 9Ni steel with a manually determined fiber rate of 70%, the sample number is 1551-1-1, and the impact sample size is 7.5×10×55mm, then b=7500μm; see figure 2 , the observed, analyzed and calculated crystallization area S=12695980.14μm 2 , then its fracture fiber rate is:

[0042] FA=[1-S / (a×b)]×100%=78.8%

Embodiment 3

[0044] Use a scanning electron microscope to observe the impact fracture morphology of 9Ni steel with a manually determined fiber ratio of 65%, the sample number is 561-2-3, and the impact sample size is 10×10×55mm, then b=10000; see image 3 , the observed, analyzed and calculated crystallization area S=25084739.84μm 2 , then its fracture fiber rate is:

[0045] FA=[1-S / (a×b)]×100%=68.6%

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Abstract

The invention relates to a 9Ni steel fracture fiber rate judgment method which comprises the following steps of: 1) observing 9Ni steel impact fracture morphology by using a scanning electron microscope, and shooting a 9Ni steel impact fracture low-multiple and full-fracture macroscopic morphology picture, 2) shooting a 9Ni steel impact fracture high-magnification picture by using a scanning electron microscope, analyzing the 9Ni steel impact fracture micro morphology and distinguishing a crystallization region and a fiber region, 3) according to the distinguishing result in the step 2), marking a crystallization area on the impact fracture macroscopic morphology picture by using a scanning electron microscope, and calculating the area of the crystallization area by using image analysis software, and calculating the 9Ni steel impact fracture fiber rate. The method has the advantages that the error of judging the fracture fiber rate by manually comparing fracture fiber rate maps given in the national standard is reduced, the influence of human factors is reduced, the measurement precision is relatively high, the accuracy of judging the fracture fiber rate is improved, and the imagecan be reserved and has traceability and verifiability.

Description

technical field [0001] The invention belongs to the field of analyzing and testing the physical properties of metal materials, and in particular relates to a method for judging the fracture fiber ratio of a 9Ni steel impact sample. Background technique [0002] The determination method of the fiber rate at the impact fracture of 9Ni steel is based on the national standard "GB / T 229-2007 Charpy Pendulum Impact Test Method for Metal Materials". Morphology Figure C.2 Fracture Appearance Fracture Morphology and Shear Section Ratio Contrast Map", but this standard clearly points out that "fracture evaluation has a high degree of subjectivity". [0003] The national standard GB / T 229-2007 was revised in 2007. It is mainly applicable to low-alloy high-strength steel with low Ni content. At that time, my country’s 9Ni steel was completely dependent on imports. It was not until 2012 that 9Ni steel was independently developed and localized. Engineering Applications. Therefore, GB / T 2...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/2251
CPCG01N23/2251
Inventor 张宏亮朱莹光赵启斌王飞龙侯家平李红李文竹王光鑫冷松洋钟莉莉
Owner ANGANG STEEL CO LTD
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