Crystal orientation relationships among acicular ferrite, oxide and the austenite matrix in a steel weld metal

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Acicular ferrite (AFα) formed on oxide particles in steel weld metals has a positive effect on toughness at low temperature. Good lattice coherency between AFα and oxide is one of the proposed reasons for promotion of AFα formation. Lattice coherency is affected by crystal structure of oxide and crystal orientation relationship (OR) between oxide and AFα. In the present study, ORs among AFα, oxide and γFe are investigated in a low carbon steel weld metal. Cube-cube (C-C) OR is observed between γFe and the oxide. It is probable that the oxide liquefied at high temperature, and then crystalized having the C-C OR with the surrounding γFe during cooling in welding process. Near Kurdjumov-Sachs (K-S) and near Baker-Nutting (B-N) ORs are observed between γFe/AFα and oxide/AFα, respectively. The misorientation from the B-N OR is larger than that from the K-S OR just after nucleation of AFα. This implies that AFα forms satisfying a near K-S OR with γFe essentially. It is supposed that formation of both the C-C (γFe/oxide) and near K-S (AFα/γ) ORs results in apparent formation of the near B-N OR between oxide and AFα.

Original languageEnglish
Title of host publicationTHERMEC 2021 - International Conference on Processing and Manufacturing of Advanced Materials Processing, Fabrication, Properties, Applications
EditorsMihail Ionescu, Christof Sommitsch, Cecilia Poletti, Ernst Kozeschnik, Tara Chandra
PublisherTrans Tech Publications Ltd
Pages1014-1018
Number of pages5
ISBN (Print)9783035736304
DOIs
Publication statusPublished - 2021
EventInternational Conference on Processing and Manufacturing of Advanced Materials Processing, Fabrication, Properties, Applications, THERMEC 2021 - Vienna, Austria
Duration: 2021 May 102021 May 14

Publication series

NameMaterials Science Forum
Volume1016 MSF
ISSN (Print)0255-5476
ISSN (Electronic)1662-9752

Conference

ConferenceInternational Conference on Processing and Manufacturing of Advanced Materials Processing, Fabrication, Properties, Applications, THERMEC 2021
CountryAustria
CityVienna
Period21/5/1021/5/14

Keywords

  • Acicular ferrite
  • Crystal orientation relationship
  • Oxide metallurgy
  • Weld metal

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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