The role of ferrite in Type 316H austenitic stainless steels on the susceptibility to creep cavitation

A.D. Warren, I.J. Griffiths, R.L. Harniman, P.E.J. Flewitt, T.B. Scott
2015 Materials Science & Engineering: A  
General rights This document is made available in accordance with publisher policies. Please cite only the published version using the reference above. Full terms of use are available: a b s t r a c t An ex-service Type 316H stainless steel which was subsequently aged at 500 1C for $ 22 Â 10 3 h was found to contain approximately 2% mixed (δ and α) ferrite distributed in localised regions of the microstructure. Preferred creep cavitation at boundaries was associated with these ferrite regions.
more » ... reep cavities associated with the austeniteÀ austenite À ferrite boundary junctions, showed a lenticular morphology while austeniteÀ austenite grain boundary creep cavities had a more spherical morphology. Details of the microstructure of these localised regions are described together with the creep cavity distribution. It has been established the extended heat treatment post-service did not result in any significant sintering of creep induced cavities. The results are discussed with respect to the contribution of the ferrite on the nucleation and growth of the creep cavities and the influence on the overall creep behaviour. An evaluation of the impact of low volume fractions of widely dispersed ferrite on the creep life-time of Type 316H stainless steel is discussed.
doi:10.1016/j.msea.2015.03.048 fatcat:vblabxaywzajhe4epmzc227dtm