Method for measuring length of heat-affected zone of 617 nickel-based alloy

A heat-affected zone, nickel-based alloy technology, applied in the direction of measuring devices, material analysis through optical means, instruments, etc., can solve the problem of difficult heat-affected zone length and achieve the effect of accurate measurement methods

Inactive Publication Date: 2016-12-14
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention provides a method for measuring the length of the heat-affected zone of 617 nickel-based alloy to solve the difficulty in measuring the length of the heat-affected zone of 617 nickel-based alloy in the prior art

Method used

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  • Method for measuring length of heat-affected zone of 617 nickel-based alloy
  • Method for measuring length of heat-affected zone of 617 nickel-based alloy
  • Method for measuring length of heat-affected zone of 617 nickel-based alloy

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Experimental program
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Effect test

Embodiment 1

[0037] The base material of the welded joint in this embodiment is 617 nickel-based alloy plate, the filler wire is ENiCrCoMo-1, and the welding method is argon tungsten arc narrow gap welding with heat treatment after welding. The length of the heat-affected zone of the 617 nickel-based alloy is measured by the following steps:

[0038] Step 1: the preparation of described metallographic sample is made by the following steps:

[0039] (1) Wire cutting: design the size of the welded joint of the 617 nickel-based alloy described by wire cutting according to the length of the mosaic machine sample, and the wire cutting size is a welded joint sample of 25mm×12mm×5mm;

[0040] (2) Thermal mounting: ultrasonically clean the sample to remove surface oil, and then mount the sample with a thermal mounting machine to obtain a mounting sample with a diameter of 30 mm and a thickness of 13 mm;

[0041] (3) Coarse grinding and fine grinding: Use water sandpaper with a particle size of 18...

Embodiment 2

[0047] The base metal of the welded joint in this embodiment is 617 nickel-based alloy plate, the filler wire is ENiCrCoMo-1, and the welding method adopts argon tungsten arc narrow gap welding without heat treatment after welding. The length measurement steps 1 and 2 of the heat-affected zone of the 617 nickel-based alloy are the same as in Example 1.

[0048] Observing the near-seam area of ​​the welded joint of the metallographic sample through an optical microscope or a scanning electron microscope, it can be observed that the morphology of carbides in the heat-affected zone has changed significantly compared to that of the base metal under a magnification of 1000 times. The carbides of the base metal are polygonal regular shapes, while the carbides in the heat-affected zone are irregular shapes, and herpes-like (under light microscope observation) or concave-shaped (under electron microscope observation) rings can also be observed around the carbides in the heat-affected z...

Embodiment 3

[0050] The base metal of the welded joint in this embodiment is a 617 nickel-based alloy plate, and the welding method is fiber laser welding and heat treatment is performed after welding. The length measurement steps 1 and 2 of the heat-affected zone of the 617 nickel-based alloy are the same as in Example 1.

[0051] Observing the near-seam area of ​​the welded joint of the metallographic sample through an optical microscope or a scanning electron microscope, it can be observed that the morphology of carbides in the heat-affected zone has changed significantly compared to that of the base metal under a magnification of 1000 times. The carbides in the base metal are polygonal regular shapes, while the carbides in the heat-affected zone are irregular in shape, and small particles will be precipitated around the carbides in the heat-affected zone. Therefore it can be determined that the boundary (such as Figure 5 The white dotted line on the right side of a), the boundary lin...

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Abstract

The invention discloses a method for measuring the length of a heat-affected zone of 617 nickel-based alloy. The method comprises the steps that a metallographic specimen is prepared, and the length of the heat-affected zone of the 617 nickel-based alloy is measured by observing the metallographic specimen under a microscope; the boundary line of the heat-affected zone and a 617 nickel-based alloy basic material is determined by observing the morphologic changes of carbides in a near weld zone of a welding joint of the metallographic specimen through the microscope, that is to say, by combining the characteristic changes around the carbides, and then the distance between the boundary line and a fusion line is obtained, that is to say, the length of the heat-affected zone is obtained. According to the method, the problem that the length of the heat-affected zone of the 617 nickel-based alloy is difficult to measure is solved; meanwhile, a simpler and more accurate measurement method is provided, and help is provided for scientific research in the field.

Description

technical field [0001] The invention relates to the field of welding, in particular to a method for measuring the length of a heat-affected zone of a 617 nickel-based alloy, which is suitable for measuring the length of the heat-affected zone of the 617 nickel-based alloy under various welding methods. Background technique [0002] 617 nickel-based alloy is a Ni-Cr-Co-Mo superalloy mainly solid solution strengthening, with high creep strength, excellent high temperature oxidation resistance and high temperature stability, mainly used in aerospace under high temperature environment , power stations and other fields, is an ideal high temperature material. Welding is a low-cost, high-productivity manufacturing method. For example, the material of a steam turbine rotor in a power station is 617 nickel-based alloy, and the manufacturing method is made by argon tungsten arc welding. But at the same time, welding also has some shortcomings, such as defects such as overheating zone...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/84
CPCG01N21/84
Inventor 徐华力芦凤桂崔海超王朋丁玉明刘霞
Owner SHANGHAI JIAO TONG UNIV
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