Tomaž Vuherer (Author), Andrej Godina (Author), Zijah Burzić (Author), Vladimir Gliha (Author)

Abstract

The resistivity of coarse grain steel against crack initiation in the presence of micro defects is discussed. Samples of material with martensitic microstructure were prepared by adequate thermal treatment. Microstructurally small Vickers indentations were used as an artificial micro defect. The compressive residual stresses are due to the irreversibility of plastic deformation. The moment of indenting enables to prepare samples with and without effects of residual stresses. The stress level for crack initiation depends on the actual indentation size. The location of initiated cracks is affected by the presence and character of residual stresses.

Keywords

zvarni spoji;mikro defekt;grobo zrnato TVP;nastanek razpoke;rast razpoke;koncentracija napetosti;lomna trdnost;Vickers;zaostale napetosti;welded joints;micro defect;coarse grain HAZ;crack initiation;crack growth;stress concentration;fatigue limit;residual stresses;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UM FS - Faculty of Mechanical Engineering
UDC: 621.791.051:539.388.1
COBISS: 11582742 Link will open in a new window
ISSN: 0543-5846
Views: 926
Downloads: 96
Average score: 0 (0 votes)
Metadata: JSON JSON-RDF JSON-LD TURTLE N-TRIPLES XML RDFA MICRODATA DC-XML DC-RDF RDF

Other data

Secondary language: Croatian
Secondary title: Nastanak zamorne pukotine iz mikrostrukturno malih vickersovih otisaka
Secondary abstract: Proučavana je otpornost grubozrnatog dijela zone utjecaja topline na nastanak zamorne pukotine u prisustvu mikro greški. Uzorci materijala s martenzitnom grubozrnatom mikrostrukturom pripremljeni su odgovarajućom toplinskom obradom. Kao umjetne mikro greške upotrijebljene su mikrostrukturno mali Vickers otisci. Tlačna zaostala naprezanja pojave se zbog nepovratnosti plastične deformacije. Moment kad se napravi otisak omogućava pripremu uzoraka s i bez efekata zaostalih naprezanja. Kritičkna razina naprezanja za nastanak pukotine zavisi od stvarne veličine otiska. Na lokaciju nastanka pukotine utječe i prisutnost te vrsta zaostalih naprezanja.
Secondary keywords: zvarni spoji;mikro defekt;grobo zrnato TVP;nastanek razpoke;rast razpoke;koncentracija napetosti;lomna trdnost;Vickers;zaostale napetosti;
URN: URN:SI:UM:
Type (COBISS): Scientific work
Pages: str. 237-243
Volume: 46
Issue: 4
Chronology: 2007
ID: 10846218