Dendrite etchant and corrosion method for large ingot modified in617 alloy

A etchant and alloy technology, which is applied to the dendritic etchant and its corrosion field of large ingot type modified IN617 alloy, can solve the problem of clear corrosion of the unmodified IN617 alloy, and achieve good corrosion effect.

Active Publication Date: 2020-06-16
TIANJIN HEAVY EQUIP ENG RES +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above analysis, the embodiment of the present invention aims to provide a dendrite etchant and corrosion method for a large ingot modified IN617 alloy to solve the problem that the existing etchant cannot corrode the improved IN617 alloy with clear dendrites question

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  • Dendrite etchant and corrosion method for large ingot modified in617 alloy
  • Dendrite etchant and corrosion method for large ingot modified in617 alloy
  • Dendrite etchant and corrosion method for large ingot modified in617 alloy

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Embodiment 1

[0036] This embodiment discloses a dendrite etchant for a large ingot modified IN617 alloy smelted by a triple process. The composition of the dendrite etchant is:

[0037]

[0038] In the formulation of the dendrite etchant provided in this example, using ethanol as a solvent can increase the reaction rate and ensure the uniformity of dendrite erosion. Therefore, ethanol has a certain effect of electrolytic polishing; and concentrated hydrochloric acid and concentrated nitric acid are mixed. It will generate more oxidizing nitrosyl oxide, whose molecular formula is NOCl, and nitrosyl oxide and Cl in the corrosive solution - Both are highly oxidizing, making them superior to traditionally used solutions in corroding dendrites.

[0039] In order to further ensure the corrosion effect of the dendrite etchant, the concentration of each component in the formula of the above dendrite etchant is respectively: the mass percent concentration of concentrated hydrochloric acid is 36%...

Embodiment 2

[0042]On the one hand, this embodiment provides a method for preparing a dendrite corrosive agent for a large ingot modified IN617 alloy smelted by a triple process. According to the above-mentioned composition ratio of the dendrite corrosive agent for the modified IN617 alloy, sequentially add Water, concentrated hydrochloric acid, ethanol and concentrated nitric acid were stirred evenly with a glass rod to prepare a dendritic etchant for a large ingot modified IN617 alloy. It should be noted that the dendritic etchant has the best effect when it is newly prepared, so it is best to prepare it and use it immediately.

[0043] On the other hand, this embodiment also provides a method for corroding the dendrite etchant of the large ingot type modified IN617 alloy smelted by the triple process, using the above-mentioned dendrite etchant of the large ingot type modified IN617 alloy, the method includes the following step:

[0044] S1. Prepare a test sample of modified IN617 alloy...

Embodiment 3

[0051] This embodiment discloses a dendritic etchant for a large ingot modified IN617 alloy smelted by a triple process. The dendrite etchant includes concentrated hydrochloric acid, concentrated nitric acid, water and ethanol; the components and volume contents of the dendrite etchant are:

[0052]

[0053] The concrete preparation steps of above-mentioned dendrite etchant are:

[0054] S1: Preparation of testing samples for modified IN617 alloy

[0055] Roughly grind, finely grind, polish, clean and dry the test sample; among them:

[0056] Put the sample on the sample grinding machine for coarse grinding and fine grinding: grind with 180#, 320#, 600#, 800#, 1200#, 2000# sandpaper respectively, add water to cool during the grinding process, and the scratches are in the same direction One of the grindings is completed immediately, and when the next grinding is performed, the grinding direction is perpendicular to the scratch direction of the previous one, and the grinding...

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Abstract

The invention relates to a dendritic crystal etchant of a large ingot type modified IN617 alloy and a corrosion method thereof, belongs to the technical field of metallographic sample preparation, andsolves the technical problem that the existing etchant cannot corrode a clear dendritic crystal structure of the ingot type modified IN617 alloy in the prior art. The dendritic corrosion agent of thelarge ingot type modified IN617 alloy comprises 80-120 ml of concentrated hydrochloric acid, 9-15 ml of concentrated nitric acid, 100-130 ml of water and 10-20 ml of ethanol. The etchant provided bythe invention can rapidly and clearly corrode the dendritic structure in the as-cast state and the homogenized heat treatment state of the modified IN617 alloy, measure the dendritic spacing, measurethe components between dendrites and dendrite arms through energy spectrum, analyze the segregation degree of the dendrites, evaluate the elimination effect of the as-cast structure and the homogenized heat treatment of the modified IN617 alloy on the dendritic segregation, and provide an important basis for formulating the homogenization process before forging.

Description

technical field [0001] The invention relates to the technical field of metallographic detection and corrosion, in particular to a dendritic etchant for a large ingot-type modified IN617 alloy and a corrosion method thereof. Background technique [0002] The 700°C advanced ultra-supercritical coal-fired power generation technology is a promising clean power generation technology, which has important practical significance for improving unit efficiency and reducing greenhouse gas emissions. The material of traditional generator set rotor forgings is heat-resistant steel, but it can no longer meet the requirements under the condition of 700 ° C, so it is necessary to develop large-tonnage nickel-based alloy forgings. Before that, the evaluation of castings is essential. The analysis of dendrite segregation in castings is an important link. Dendrite corrosion can accurately display the solidified structure of the casting. By observing the solidified dendrite structure, the dis...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25F3/24C22C38/30C22C38/28C22C38/26C22C38/22C22C38/06
CPCC22C38/06C22C38/22C22C38/26C22C38/28C22C38/30C25F3/24
Inventor 聂义宏李红梅白亚冠朱怀沈
Owner TIANJIN HEAVY EQUIP ENG RES
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