Effects of plastic pre-straining level on the creep deformation, crack initiation and growth behaviour of 316H stainless steel

Mehmanparast, Ali and Davies, Catrin M. and Dean, David W. and Nikbin, Kamran (2016) Effects of plastic pre-straining level on the creep deformation, crack initiation and growth behaviour of 316H stainless steel. International Journal of Pressure Vessels and Piping, 141. pp. 1-10. ISSN 0308-0161 (https://doi.org/10.1016/j.ijpvp.2016.03.013)

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Abstract

The effects of the material pre-straining level, in the form of plastic pre-compression at room temperature, on the tensile, creep deformation, creep crack initiation and growth behaviour of 316H stainless steel have been examined at 550 °C. Experiments have been performed on the 4%, 8% and 12% pre-compressed specimens and the results are compared with existing data on the pre-compressed material to investigate the change in mechanical response, creep failure, creep crack initiation and growth behaviour of 316H over a range of plastic pre-straining levels. Comparisons are also made to short term and long term test data on the as-received material. It has been found that creep ductility and rupture times decreased with an increase in pre-strain levels considered. The test results obtained from different material states are discussed in terms of the influence of material pre-straining level on the microstructural deformation, mechanical response, creep deformation and crack growth behaviour of the material.

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