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Method for evaluating the tendency of anisotropic metals and alloys to crack

An alloy material, anisotropic technology, applied in the direction of applying stable tension/pressure to test material strength, etc., can solve the problem of inability to evaluate the axial cracking tendency of small-sized plates, rods, and wires of anisotropic metal and alloy materials, etc. problem, achieve the effect of reducing the risk of batch sampling and inspecting a wide range

Active Publication Date: 2019-10-18
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] In order to overcome the deficiency that the test methods existing in the prior art cannot evaluate the cracking tendency of anisotropic metal and alloy materials small gauge plates, rods and wires along the axial direction, the present invention proposes a method for evaluating the cracking of anisotropic metals and alloy materials preferred method

Method used

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  • Method for evaluating the tendency of anisotropic metals and alloys to crack
  • Method for evaluating the tendency of anisotropic metals and alloys to crack
  • Method for evaluating the tendency of anisotropic metals and alloys to crack

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Embodiment Construction

[0057] The invention proposes a method for evaluating the cracking tendency of the metal and alloy structural materials along the material axis with the breaking strength between 300 and 2200 MPa. The test system used in the present invention is a hydraulic burst test system.

[0058] The specific process is as follows:

[0059] Step 1, making of sample:

[0060] For the raw materials of rods and wires, use a grinding wheel cutter to cut a section of φ10mm rod with a length of 100mm to obtain a cylinder of this material. The grinding wheel cutting machine is Bosch brand TCO2100.

[0061] For the raw material of the plate, a section of the material cylinder is obtained by cutting with a wire electric discharge machine. The electric spark cutting machine selects the Dk77 series CNC fast wire cutting machine of Suzhou Electric Machine Tool Research Institute.

[0062] The axis of rotation of the cylinder coincides with the direction of grain flow of the material being evaluat...

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Abstract

The invention discloses a method for evaluating the cracking tendency of an anisotropic metal and an alloy material. A fluid is injected into a shell of a sample and is pressurized to apply a uniformpressure to the sample. The pressurization causes the sample to expand and deform, thereby creating a circumferential tensile stress on the inner and outer surfaces of the shell of the sample. The fluid pressure is increased continuously until a cylinder of the sample is destroyed. The method for evaluating the tendency of the anisotropic metal and the alloy material to crack along the axial direction through the performance characterization namely circumferential breakage strength overcomes the defect that a test method in the prior art cannot evaluate the tendencies of small-sized plates, rods and wires made of the anisotropic metal and the alloy material to crack along the axial direction, and fills the blank of a method for evaluating the axial failure crack of this type of product.

Description

technical field [0001] The invention relates to the testing field, in particular to a method for evaluating the axial cracking tendency of anisotropic metal and alloy materials when they are served as structural materials under normal temperature conditions due to one load. Background technique [0002] It is well known that the anisotropy of the mechanical properties of metals and alloys is ubiquitous to varying degrees. [0003] Especially in the thermal processing of metals and alloys, with the occurrence of macroscopic deformation processes such as forging, drawing, and rolling, the grains at the microscopic level follow the deformation and elongate along the macroscopic elongation direction, resulting in the so-called grain flow. Line (grainflow). The appearance of grain streamlines makes the mechanical properties of materials containing grain streamlines anisotropic. When loaded along the direction of streamline elongation, the material has high mechanical properties...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/10
Inventor 王泓
Owner NORTHWESTERN POLYTECHNICAL UNIV
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