Influence of the microdefect in coarse grain heat affected zone on the crack initiation and propagation

In our study coarse grain (CC), heat affected zone (HAZ) material with stress concentration and small defect is investigated by using the rotary bending test. For simulation of artificial CG HAZ thermal cycle welding simulator and furnace were used. Cooling speed was the same as at a real welding. A...

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Bibliographic Details
Published inMetalurgija Vol. 45; no. 3; p. 214
Main Authors Vuherer, T, Glilia, V, Godina, A, Burzid, Z
Format Journal Article
LanguageEnglish
Published 01.07.2006
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Summary:In our study coarse grain (CC), heat affected zone (HAZ) material with stress concentration and small defect is investigated by using the rotary bending test. For simulation of artificial CG HAZ thermal cycle welding simulator and furnace were used. Cooling speed was the same as at a real welding. Artificial CG HAZ microstructure was martensitic and coarse (grains of approx. 200mum). Small defects were prepared by Vickers indentation (d- 220mum and h approx. 25mum). Defects geometry was measured by special optical method. Stress concentration (1,74) due to the weld toe was achieved by using corresponding groove. Crack initiation and propagation at were investigated. The study shoves the influence of defects and residual stress in CG HAZ on crack initiation and fatigue strength.
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ISSN:0543-5846