STEEL GRIPS online - Improvement of fatigue resistance of low-nickel stainless steels for biomedical applications compared to CoCr-alloys

STEEL GRIPS online
ISSN 1866-8453

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Feb 3, 2012

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Amer Eid Amer, Sabine Weiß, and Alfons Fischer:
Improvement of fatigue resistance of low-nickel stainless steels for biomedical applications compared to CoCr-alloys

Fatigue data of steels for biomedical applications, high nitrogen stainless steels, nickel-free stainless steel, CoCr alloy, investigation of microstructural behaviour under pure fatigue tension

Much was published about the corrosion of steels for biomedical applications, anyhow, fatigue data are hardly available, especially on steel X6CrNiMnMoN22-10-4-3.In this contribution the microstructural changes of four different solution annealed fcc materials subjected to pure fatigue tension were studied. Standard materials X5CrNiMo17-13-2 (1.4441, AISI 316L) and the Co-base alloy CoCr29Mo6 in addition to two high-nitrogen stainless steels X13CrMnMoN18-14-3 (1.4452) and X6CrNiMnMoN22-10-4-3 were investigated.
The fatigue tests were carried out in air using a force controlled fatigue testing machine with 0.1 R-value and a frequency of 5 Hz at room temperature. The solution annealed X13CrMnMoN18-14-3 and X13CrMnMoN18-14-3 nitrogen containing steels as well as 316L-type stainless steels have been tested and their fatigue endurance limits were determined and compared to that of the CoCr alloy. TEM observations were carried out for the investigated materials before and after the fatigue tests.
The results of TEM observations reveal the effect of further nitrogen additions on the fatigue properties. Microstructure observations depicted the effect of nitrogen additions on the modification of slip behaviour and the role of the stacking fault energy herein.