Mikrostrukturielle Charakterisierung von ultra-hochfesten Schweißgütern

Haslberger, Phillip; Ernst, Wolfgang; Schnitzer, Ronald

doi:10.1007/s00501-016-0494-2

Cited by 3 publications

(1 citation statement)

References 10 publications

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“…Brown and blue color variations in the martensitic matrix originate from deviations in the grain orientations. Heterogeneous morphologies create different dense etching layers resulting in the variation of the appearance of the martensite in the LOM [26]. The distinct orientations show various color scales and etching pits, which can also be seen in scanning electron microscopy investigations.…”

Section: Laves-phase Determinationmentioning

confidence: 85%

Determination of Mo-Rich Laves-Phase in Weld Metals of a Creep-Resistant 9% Cr-Steel Using Light Optical Microscopy

Pahr

Rojacz

Baumgartner

2017

Metallogr. Microstruct. Anal.

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Creep-resistant 9% Cr-steels feature different phases in their weld metal microstructure; especially after creep-rupture testing. Laves-Phase in such alloying concepts is widely studied, but there is still a need for a simple identification technique utilizing light optical microscopy. The Lichtenegger-Bloech color tint etchant was utilized to contrast the weld metals microstructure in as-welded condition, after post-weld heat treatment and creep-rupture tested. Proof of the presence of Laves-Phase after creeprupture tests in the weld metal of a 9% Cr-steel GX13CrMoCoVNbNB9-2-1 (CB2) was performed using Lichtenegger-Bloech and light optical microscopy. To validate Laves-Phase within the analyzed microstructure, scanning electron microscopy and energy dispersive x-ray spectroscopy were performed. For a thorough analysis, phase analysis was done in selected regions of interest. The results show that the Laves-Phase in this type of steel can be easily contrasted and quantified at comparatively low lateral resolutions by Lichtenegger-Bloech, with no further need of analysis required.

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Section: Laves-phase Determinationmentioning

confidence: 85%

Determination of Mo-Rich Laves-Phase in Weld Metals of a Creep-Resistant 9% Cr-Steel Using Light Optical Microscopy

Pahr

Rojacz

Baumgartner

2017

Metallogr. Microstruct. Anal.

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Comparative study of phase transformation temperatures in high strength steel weld metals

Sharma¹,

Reisgen²

2017

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Etching Methods for the Microstructural Characterization of a Heat Resistant 2.25Cr-1Mo-0.25V Weld Metal

Schönmaier

Pölzgutter

Schnitzer

2020

Practical Metallography

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Submerged arc welded heat resistant 2.25Cr-1Mo-0.25V weld metals are increasingly used for hydrocrackers and thick-walled pressure vessels in the petrochemical industry. They are exposed to high pressures and temperatures of more than 450 °C. In order to satisfy the high demands with respect to strength and toughness, they are typically subjected to a post-welding heat treatment at temperatures in the range of 691 – 719 °C. During heat treatment, a large number of changes take place in the weld's microstructure. These changes can partly be observed during a light microscope examination. Etching studies described in the literature are mostly concerned with determining phase fractions in multi-phase steels. This work shows how selective etching and precipitation etching allow for contrasting various microstructural features. While the etching solutions Klemm I, aqueous sodium metabisulfite, and picric acid are suitable for revealing the former austenitic grain structure, the dendritic solidification structure of samples in as-welded condition can be contrasted using color etching techniques according to LePera, Klemm I, and Beraha I. For an identification of changes in the shape of dendrites, it is recommended to perform picric acid etching. Color etchings according to Klemm I and LePera are recommended for revealing larger carbides, as they provide a good contrast between the carbides which appear bright, while the surrounding microstructure is colored.

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Mikrostrukturielle Charakterisierung von ultra-hochfesten Schweißgütern

Cited by 3 publications

References 10 publications

Determination of Mo-Rich Laves-Phase in Weld Metals of a Creep-Resistant 9% Cr-Steel Using Light Optical Microscopy

Determination of Mo-Rich Laves-Phase in Weld Metals of a Creep-Resistant 9% Cr-Steel Using Light Optical Microscopy

Comparative study of phase transformation temperatures in high strength steel weld metals

Etching Methods for the Microstructural Characterization of a Heat Resistant 2.25Cr-1Mo-0.25V Weld Metal

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