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Precipitation of Ions03:11

Precipitation of Ions

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Predicting Precipitation
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:
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Precipitation and Co-precipitation01:17

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Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
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Precipitation Reactions03:10

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In a precipitation reaction, aqueous solutions of soluble salts react to give an insoluble ionic compound – the precipitate. The reaction occurs when oppositely charged ions in solution overcome their attraction for water and bind to each other, forming a precipitate that separates out from the solution. Since such reactions involve the exchange of ions between ionic compounds in aqueous solution, they are also referred to as double displacement, double replacement, exchange reactions, or...
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Conjugate Addition (1,4-Addition) vs Direct Addition (1,2-Addition)01:27

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α,β-Unsaturated carbonyl compounds with two electrophilic sites, the carbonyl carbon, and the β carbon, are susceptible to nucleophilic attack via two modes: conjugate or 1,4-addition and direct or 1,2-addition.
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Direct addition products are...
4.2K
Precipitation Processes01:12

Precipitation Processes

5.9K
The experimental conditions in a gravimetric analysis should be optimized to maximize the particle size and purity of the obtained precipitate. Ideally, the concentration of the precipitating reagent should be low with effective stirring to maintain low relative supersaturation for the growth of large crystals. In homogeneous precipitation, the precipitant is slowly generated by a chemical reaction in the solution to avoid local reagent excesses. For example, urea decomposes gradually to...
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Conjugate Addition of Enolates: Michael Addition01:08

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The attack of a nucleophile at the β carbon of an α,β-unsaturated carbonyl compound is called conjugate addition. Conjugate addition reactions of active methylene compounds, such as β-diketones, β-keto esters, β-keto nitriles, and α-nitro ketones, are called Michael addition reactions.
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Precipitates in Additively Manufactured Inconel 625 Superalloy.

Beata Dubiel1, Jan Sieniawski2

  • 1Faculty of Metals Engineering and Industrial Computer Science, AGH University of Science and Technology, Al. Mickiewicza 30, 30-059 Kraków, Poland. bdubiel@agh.edu.pl.

Materials (Basel, Switzerland)
|April 11, 2019
PubMed
Summary
This summary is machine-generated.

This study details the microstructure of Inconel 625 superalloys made with laser-based additive manufacturing. Key precipitates like MC and M23C6 carbides and Laves phase were identified in the as-built condition.

Keywords:
Inconel 625additive manufacturinglaser directed energy depositionlaser powder-bed fusionmicrostructureprecipitatestransmission electron microscopy

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Area of Science:

  • Materials Science
  • Metallurgy
  • Additive Manufacturing

Background:

  • Laser-based additive manufacturing (AM) is crucial for nickel-based superalloys.
  • Microstructure and secondary phase precipitation significantly impact AM superalloy properties.
  • Understanding Inconel 625's microstructure is vital for its applications.

Purpose of the Study:

  • To review literature on Inconel 625 microstructure from laser-based AM.
  • To identify precipitates in Inconel 625 produced by directed energy deposition (DED).
  • To analyze the phase identification of these precipitates.

Main Methods:

  • Literature review of laser-based powder-bed fusion and directed energy deposition processes.
  • Microstructural investigation using light microscopy and transmission electron microscopy (TEM).
  • Phase analysis via selected area electron diffraction (SAED) and energy-dispersive X-ray spectroscopy (EDS).

Main Results:

  • Inconel 625 fabricated via laser-based DED exhibits specific microstructural features.
  • Precipitates were identified in the interdendritic regions of the as-built material.
  • Identified precipitates include MC and M23C6 carbides and the Laves phase.

Conclusions:

  • The study provides a comprehensive overview of Inconel 625 microstructure in AM.
  • Specific precipitates influencing properties have been identified in DED-processed Inconel 625.
  • This research aids in optimizing AM processes for nickel-based superalloys.