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High-temperature ductility cracking quasi-in-situ test method of nickel-based alloy welding material

A nickel-based alloy and welding material technology, which is applied in the field of high-temperature loss crack testing of nickel-based alloy welding materials, can solve problems such as inability to distinguish high-temperature loss cracks and liquefaction cracks, inability to accurately obtain critical strain, and inaccurate evaluation. To achieve the effect of true and reliable test results, low cost and simple method

Inactive Publication Date: 2019-12-20
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the transverse adjustable restraint test can obtain the loss temperature range, but cannot accurately obtain the critical strain at the time of cracking, and cannot distinguish high temperature loss cracks from liquefaction cracks; the strain cracking test method proposed by Nissley, with the help of a thermal simulator, can The test temperature is accurately controlled, and the strain is measured by a high-temperature extensometer, but the measured strain is the average value within 4mm, which is far from the local strain value that causes cracking, making the evaluation not very accurate

Method used

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  • High-temperature ductility cracking quasi-in-situ test method of nickel-based alloy welding material
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  • High-temperature ductility cracking quasi-in-situ test method of nickel-based alloy welding material

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Embodiment 1

[0031] A quasi-in-situ evaluation method for high-temperature loss and cracking of nickel-based alloy welding materials, the method comprising the following steps:

[0032] (1) Take samples from the surfacing layer of nickel-based alloy welding materials, process tensile samples, the sample size is 70×15×3mm, the surface of the sample is pre-ground to 2000 mesh sandpaper, and then polished and electrolytically corroded to expose the microstructure appearance, and no obvious scratches.

[0033] (2) Use a laser marking machine to prepare several straight stripes in the central area of ​​the tensile sample surface within 20mm along the width direction and length direction, the stripe line width and depth are 1-5μm, and the stripe spacing is 0.2-1mm.

[0034] (3) Load the sample on the Gleeble thermal simulation testing machine and vacuumize it. Rapidly heat the sample to 0.5-0.8Tm (Tm is the melting point), keep it warm for 30s, then apply a displacement at a certain rate, and k...

Embodiment 2

[0038] The method for testing and evaluating the high-temperature loss cracking of nickel-based alloy materials in this embodiment mainly includes the following steps:

[0039] (1) Taking the nickel-based alloy FM52 surfacing material as an example, 7 peak temperatures are selected, and 6 to 8 tensile specimens are processed at each temperature. The schematic diagram of the tensile specimens is shown in figure 1 . Among them, the length of the tensile sample is 70 mm, the width is 15 mm, and the thickness is 3 mm.

[0040] (2) Mechanically grind the surface of all samples to a fineness of 2000 mesh sandpaper. During this process, the final thickness of the sample is reduced to about 2.8mm, and then the surface is polished.

[0041] (3) Use a laser marking machine to prepare parallel stripes along the width and length directions in the 20 mm area of ​​the center of the sample surface. The depth and width of the stripes in the width direction are about 5 μm, the edges are smoot...

Embodiment 3

[0049] A kind of quasi-in-situ testing method of high-temperature loss-delay cracking of nickel-based alloy welding materials, the method comprising the following steps:

[0050] 1) Perform surface pretreatment on the tensile sample of nickel-based alloy welding material. The surface pretreatment process is: use 2000 mesh sandpaper to pre-grind the surface of the tensile sample, then polish to W0.5, and then electrolytically corrode to Can present microstructure;

[0051] 2) A laser is used to prepare multiple horizontal stripes and multiple longitudinal stripes in the central area of ​​the tensile sample. The horizontal stripes are parallel to the width direction of the tensile sample, and the longitudinal stripes are parallel to the length direction of the tensile sample; the length of the horizontal stripes is 8-12mm, width and depth are 1-5μm; the length of the longitudinal stripes is 18-22mm, width and depth are 1-5μm; two adjacent horizontal stripes or between two adjace...

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Abstract

The invention relates to a high-temperature ductility cracking quasi-in-situ test method of a nickel-based alloy welding material. The method comprises the following steps: (1) performing surface pretreatment on a tensile sample of the nickel-based alloy welding material; (2) preparing transverse stripes and longitudinal stripes in the central area of the tensile sample in the step (1); (3) performing a high-temperature thermal cycle test on the tensile sample in the step (2), and applying a strain load in a heat preservation stage; (4) characterizing the tensile sample after the high-temperature thermal cycle test, and counting the number of cracks and local strain capacity; and (5) and drawing a temperature-strain-crack quantity statistical graph to obtain the sensitive temperature rangeof the high-temperature ductility cracking of the nickel-based alloy material and a corresponding critical strain value. Compared with the prior art, the method can successfully and effectively obtain the high-temperature ductility cracking sensitive temperature range and the critical strain of the nickel-based alloy material, and provides quasi-in-situ data support for the mechanism explanationof the high-temperature ductility cracking.

Description

technical field [0001] The invention belongs to the technical field of high-temperature loss-delay crack testing of nickel-based alloy welding materials, and relates to a high-temperature loss-delay crack sensitivity test method applicable to various nickel-based alloy welding materials. Background technique [0002] The high-temperature loss crack is a kind of thermal crack that occurs in the range of 0.5-0.8 times the melting temperature. In this temperature range, the ductility of the material decreases rapidly, and at the same time, deformation occurs under the action of external force, resulting in the phenomenon of intergranular cracking. High-temperature loss-of-elongation cracks are small in size and difficult to detect by conventional means. Once they occur, they are difficult to eliminate, and often become the source of fatigue cracks, which poses a very large safety hazard. Nickel-based alloy welding materials play an important role in the welding of dissimilar m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/18
CPCG01N3/18G01N2203/0017G01N2203/0062G01N2203/0075G01N2203/0226G01N2203/0641
Inventor 余春任博杨德志陆皓徐济进陈俊梅
Owner SHANGHAI JIAO TONG UNIV
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