ǂThe ǂeffect of small flaws on the fatigue strength of HAZ at the weld toe

Abstract

The effects of small artificial surface flaws on the fatigue strength of HAZ material are studied. The samples of coarse grain HAZ material were prepared using a welding thermal-cycle simulator. The artificial flaws were produced byindenting with a Vickers pyramid at different loads as either single indentations or as a series. The size of the flaws did not exceed the primary austenitic grain size of the material, which is the most relevant microstructural unit of carbon steels. The dependence of the experimentally determined bending fatigue strength of treated coarse grain HAZ materials on the properly evaluated size of the artificial flaws was compared with the law of long-crack propagation. The biggest flaws evaluated with the flaw-size parameter ?area ? 100 m are still small for the studied coarse grain HAZ. In further experimental work, the effects of flaw size and the effects of residual stresses should be analysed separately.

Keywords

welding;welded joints;coarse grained HAZ;crack initiation;flaw-size parameter;small surface flaws;stress intensity range;Vickers indentation;weld toe;

Data

Language:	English
Year of publishing:	2007
Typology:	1.01 - Original Scientific Article
Organization:	UM FS - Faculty of Mechanical Engineering
UDC:	621.791.05:539.4
COBISS:	11337494
ISSN:	0268-1900
Views:	1521
Downloads:	100
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary keywords:	varjenje;zvarni spoji;grobo zrnato TVP;nastanek razpoke;parametri velikosti razpoke;majhne površinske rapoke;intenzivnost napetosti;Vickers odtis;prehod temena zvara;
URN:	URN:SI:UM:
Pages:	str. 297-310
Volume:	ǂVol. ǂ29
Issue:	ǂno. ǂ1/4
Chronology:	2007
ID:	8717350