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Cause of Damage – Hot Cracking

Dedicated to the Lette Verein Berlin on the occasion of its 150th jubilee
  • T. Wader
Published/Copyright: September 29, 2016
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Practical Metallography
From the journal Practical Metallography Volume 53 Issue 10

Abstract

Under certain conditions, Nb-containing stainless steels are susceptible to hot cracking. Such conditions include low melting phases on the grain boundaries, a coarse-grained microstructure such as cast structures, microstructure orientations towards the main tensile direction and high processing temperatures. The case of damage was characterized using metallographic and microanalytical methods. In the laboratory, the critical temperature range for the formation of hot cracks could furthermore specifically be localized under mechanical stresses by means of a dilatometer aiming at clearly verifying the cause of the damage, namely “hot cracks”.

Kurzfassung

Unter bestimmten Bedingungen neigen Nb-haltige, nichtrostende Edelstähle zu Heißrissbildung. Bedingung hierfür sind niedrigschmelzende Phasen auf den Korngrenzen, grobkörniges Gefüge z. B. Gussgefüge, Orientierungen des Gefüges zur Hauptzugrichtung und hohe Verarbeitungstemperaturen. Der Schadensfall wurde metallographisch und mikroanalytisch charakterisiert. Des Weiteren konnte der für die Entstehung von Heißrissen kritische Temperaturbereich unter mechanischer Belastung, im Labor mittels Dilatometer gezielt lokalisiert werden, um die Schadensursache „Heißrisse“ eindeutig zu verifizieren.

References / Literatur

[1] Merkblatt 821, Edelstahl- Rostfrei Eigenschaften, 5. Auflage 2014Search in Google Scholar

[2] Einteilung und Benennung von Rissen an Schweißverbindungen aus metallischen Werkstoffen DIN 8524 75Search in Google Scholar

[3] Institut für Materialforschung-Bayreuth, Heißrissbildung beim Schweißen von Aluminium in Blechrandlage, Autor Rolf Michael HilbingerSearch in Google Scholar

Received: 2016-03-03
Accepted: 2016-04-01
Published Online: 2016-09-29
Published in Print: 2016-10-14

© 2016, Carl Hanser Verlag, München

Articles in the same Issue

  1. Contents/Inhalt
  2. Contents
  3. Editorial
  4. Editorial
  5. Technical Contributions/Fachbeiträge
  6. Analysis of Crack Propagation, Determination of Dynamic Strength and Metallographic Examination / Hardness Test using the Example of a 25 CrMo 4 Monobloc Tubular Shaft
  7. Development of HT-Brazing Systems for Non-Similar Material Composites
  8. Cause of Damage – Hot Cracking
  9. Failure of Hot-Dip Galvanized Steel Parts
  10. Meeting Diary/Veranstaltungskalender
  11. Meeting Diary
https://doi.org/10.3139/147.110413

Articles in the same Issue

  1. Contents/Inhalt
  2. Contents
  3. Editorial
  4. Editorial
  5. Technical Contributions/Fachbeiträge
  6. Analysis of Crack Propagation, Determination of Dynamic Strength and Metallographic Examination / Hardness Test using the Example of a 25 CrMo 4 Monobloc Tubular Shaft
  7. Development of HT-Brazing Systems for Non-Similar Material Composites
  8. Cause of Damage – Hot Cracking
  9. Failure of Hot-Dip Galvanized Steel Parts
  10. Meeting Diary/Veranstaltungskalender
  11. Meeting Diary
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