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Article Dans Une Revue Journal of Materials Processing Technology Année : 2009

A microstructural and low-cycle fatigue investigation of weld-repaired heat-resistant cast steels

Résumé

The multi-pass weld-repair of heat-resistant cast steels is carried out using an automated shielded metal arc welding (SMAW) process, with various filler materials and pre-heating at 400 degrees C. Specimens weld-repaired with a filler material more resistant than the heat-resistant cast steel (over-matching) generally crack within the base metal following the tenth filling pass, whereas specimens buttered with a soft alloy prior to welding remain free of cracks. The high temperature strain-controlled fatigue lifetime of material weld-repaired without buttering is lower than that of bulk initial material. This is due to an increase of the stress amplitude as a result of the so-called over-matching. in the case of material welded following a prior buttering, the fatigue lifetime is reduced because of the stress tri-axiality generated in the thin soft layer which prevents its plastic flow. As a consequence, it is concluded that even though buttering prevents cracking efficiently during welding, it is not acceptable as far as fatigue performance, especially lifetime, is concerned.
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Dates et versions

hal-01703246 , version 1 (02-07-2018)

Identifiants

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Traian Branza, F. Deschaux-Beaume, Vincent Velay, Philippe Lours. A microstructural and low-cycle fatigue investigation of weld-repaired heat-resistant cast steels. Journal of Materials Processing Technology, 2009, 209 (2), pp.944-953. ⟨10.1016/j.jmatprotec.2008.03.002⟩. ⟨hal-01703246⟩
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