LOSS OF DUCTILITY IN MATERIAL NEXT TO A WELD
The paper gives the results of an investigation into the loss of ductility of the material next to the weld in Si-Al killed steel (St 41). Thermal stress relief (1 hr at 600 deg. C) causes this embrittlement to disappear almost entirely. It is shown that quench aging is not responsible for the embrittlement outside the transformed zone. The embrittlement is thought to be caused by plastic deformation at elevated temperatures resulting in tangles of dislocations, possibly formed near precipitates in the steel (in this connection the plastic deformation in the blue-brittleness temperature range should be considered as unfavourable). It is assumed that the influence of pinning by C and N atoms on the decreased mobility of the dislocations within these tangles depends on the thermal cycles to which the material is subjected during welding, and consequently it varies with a change in the distance from the weld edge.
Netherlands Center for Welding TechniquesThe Hague, Netherlands
- De Koning, A C
- Publication Date: 0
- Features: Appendices; Figures; Photos; References; Tables;
- Pagination: 11 p.
- TRT Terms: Brittleness; Crash tests; Impact; Metal heating; Plastic deformation; Welds
- Uncontrolled Terms: Heat treatment
- Old TRIS Terms: Impact properties; Weld properties
- Subject Areas: Marine Transportation; Materials; Research;
- Accession Number: 00010204
- Record Type: Publication
- Files: TRIS
- Created Date: Feb 25 1973 12:00AM