The Paton Welding Journal, 2012, №05



2012 №05 (04)

2012 №05 (06)

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The Paton Welding Journal, 2012, #5, 26-30 pages  

MICROSTRUCTURAL FEATURES OF FATIGUE DAMAGEABILITY AND METHODS TO IMPROVE THE FATIGUE LIFE OF WELDED JOINTS FROM 09G2S STEEL

V.D. POZNYAKOV, V.A. DOVZHENKO, S.B. KASATKIN and A.A. MAKSIMENKO

E.O. Paton Electric Welding Institute, NASU, Kiev, Ukraine
 
 
Abstract
The paper presents the results of investigation of the effect of cyclic bend loading on brittle fracture resistance of the HAZ metal, as well as accumulation of fatigue damages and structural changes in butt and T-welded joints in 09G2S steel. It is shown that presence of a sharp stress raiser at low temperatures (-40 °C and lower) leads to lowering of brittle fracture resistance of HAZ metal of welded joints with fatigue damages.
 
 
Keywords: arc welding, low-alloyed steel, welded joints, brittle fracture resistance, fatigue damage, microstructure, fatigue life
 
 
Received:                03.02.12
Published:               28.05.12
 
 
References
1. Goritsky, V.M. (2004) Diagnostics of metals. Moscow: Metallurgizdat.
2. Yakovleva, T.Yu. (2003) Local plastic deformation and fatigue of metals. Kiev: Naukova Dumka.
3. Ivanova, V.S., Terentiev, V.F. (1975) Nature of fatigue of metals. Moscow: Metallurgiya.
4. Romaniv, O.N., Nikiforchin, G.N. (1986) Mechanism of corrosion fracture of structural alloys. Moscow: Metallurgiya.
5. Ivanova, V.S., Orlov, L.G., Terentiev, V.F. (1972) Specifics of dislocation structure development at static and cyclic loading of low-carbon steel. Fizika Metallov i Metallovedenie, 33(3), 617-633.
6. Wilson, D.V., Tromans, T.K. (1970) Effect of strain aging on fatigue damage in low-carbon steel. Acta Metallurgica, 18, 1197-1208.

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