Corrosive agent and a corrosion method for metallographic structure of GH4141 high-temperature alloy

Abstract

The invention discloses a corrosive agent and a corrosion method for a metallographic structure of a GH4141 high-temperature alloy, belongs to the technical field of metallographic analysis of metal materials, and solves the problem that the metallographic structure of the GH4141 high-temperature alloy cannot be clearly displayed by adopting an existing corrosive agent and an existing corrosion method. The metallographic structure corrosive comprises ethyl alcohol, concentrated hydrochloric acid and ferric chloride. The ratio of each component is as follows: 50-100ml of ethanol, 15-25ml of concentrated hydrochloric acid and 5-8g of ferric chloride. By adopting the corrosive agent disclosed by the invention, the metallographic structure of the GH4141 high-temperature alloy can be quickly and clearly corroded.

Description

technical field [0001] The invention belongs to the technical field of metallographic analysis of metal materials, and in particular relates to a GH4141 superalloy metallographic structure etchant and a corrosion method. Background technique [0002] The development of aerospace technology has put forward higher requirements for the performance of the engine, and the technical level of the aerospace engine is an important symbol to measure the level of a country's technological level and industrial strength. The performance of the engine depends mainly on the properties of the materials used. Commonly used materials in engine materials include GH4141 superalloy, the chemical composition of GH4141 superalloy mainly includes C: 0.06%-0.12%, Cr: 18%-20%, Co: 10%-12%, Mo: 9%-10.5 %, Al: 1.4%-1.8%, Ti: 3%-3.5%, Fe≤5, B: 0.003%-0.01%, Zr≤0.07, and the balance is Ni. GH4141 superalloy is a nickel-based aging-strengthened deformed superalloy, and the main strengthening phases are ...

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Problems solved by technology

[0004] According to the literature, Kalling reagent is often used to corrode the original boundary of the tissue, but through the test, although the grain boundary of GH4141 has been corroded, the corrosion is not complete, not only that, but also reacted and precipitated copper particles to pollute the corroded surface, causing It is difficult to judge the structure; hydrochloric acid and chromium oxide are also used to prepare reagents, but the corrosion effect is not satisfactory, but chromium oxide is poisonous, and there are safety hazards when used; electrolysis has also been used for corrosion, and perchloric acid, phosphoric acid and sulfuric acid are used. The mixed acid is used for corrosion, the current, voltage and corrosion time are not well controlled, and if the control is not good, the surface of the sample is ablated and the corrosion is spent, so it can only be re-grinded and polished, and the sample preparation cycle is greatly extended.

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