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High temperature time-dependent low cycle fatigue behaviour of a type 316L(N) stainless steel

Srinivasan, VS and Valsan, M and Sandhya, R and Rao, Bhanu Sankara K and Mannan, SL and Sastry, DH (1999) High temperature time-dependent low cycle fatigue behaviour of a type 316L(N) stainless steel. In: International Journal of Fatigue, 21 (1). pp. 11-21.

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Abstract

Total strain controlled low cycle fatigue tests on 316L(N) stainless steel have been conducted in air at various strain rates in the temperature range of 773-873 K to identify the operative time-dependent mechanisms and to understand their influence on the cyclic deformation and fracture behaviour of the alloy. The cyclic stress response at all the testing conditions was marked by an initial hardening followed by stress saturation. A negative strain rate stress response is observed under specific testing conditions which is attributed to dynamic strain ageing (DSA). Transmission electron microscopy studies reveal that there is an increase in the dislocation density and enhanced slip planarity in the DSA regime. Fatigue life is found to decrease with a decrease in strain rate. The degradation in fatigue resistance is attributed to the detrimental effects associated with DSA and oxidation. Quantitative measurement of secondary cracks indicate that both transgranular and intergranular cracking are accelerated predominantly under conditions conducive to DSA.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Elsevier Science.
Keywords: 316L(N) stainless steel;Low cycle fatigue;Time-dependent effects;Dynamic strain ageing; Oxidation.
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 12 Aug 2009 05:31
Last Modified: 19 Sep 2010 05:29
URI: http://eprints.iisc.ernet.in/id/eprint/19617

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