MICROSTRUCTURE AND FATIGUE PROPERTIES OF A WELDED DUPLEX STAINLESS STEEL

doi:10.1111/j.1460-2695.1996.tb01310.x

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Wiley InterScience

Fatigue & Fracture of Engineering Materials & Structures

Volume 19 Issue 6, Pages 647 - 654

Published Online: 2 Apr 2007

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MICROSTRUCTURE AND FATIGUE PROPERTIES OF A WELDED DUPLEX STAINLESS STEEL

S. Beretta ¹ M. Boniardi ¹

¹ Politecnico di Milano, Dipartimento di Meccanica, Piazza Leonardo da Vinci 32, 20133 Milano, Italy

KEYWORDS

Welded joints • Stainless (duplex) steel • Rotary bending fatigue limits • Microstructural barriers • Crack propagation modes

ABSTRACT

Abstract—In response to the increasing structural applications in duplex steels for welded structures, fatigue behaviour of a SAF 2304 grade duplex stainless steel was investigated, considering both the base metal and GTAW welded joints. Fatigue curves and fatigue limits under rotary bending fatigue were obtained. The study focused attention on the microstructural features of fatigue crack propagation of the two series of experiments, thereby permitting an evaluation of the tortuous crack path of welded joints and the mechanisms related to threshold microstructural barriers.

DIGITAL OBJECT IDENTIFIER (DOI)

10.1111/j.1460-2695.1996.tb01310.x About DOI