Effects of plastic pre-straining level on the creep deformation, crack initiation and growth behaviour of 316H stainless steel. (May 2016)

• Record Type: Journal Article
• Authors: Mehmanparast, Ali; Davies, Catrin M.; Dean, David W.; Nikbin, Kamran
• Is Part Of: International journal of pressure vessels and piping. Volume 141(2016)
• Page Start: 1
• Page End: 10
• Publication Date: 2016-05
• Subjects: Pre-straining level -- Pre-compression -- CCG -- Creep ductility -- Long term creep -- 316H; Pressure vessels -- Periodicals; Pipe -- Periodicals; Récipients sous pression -- Périodiques; Tuyaux -- Périodiques; Pipe; Pressure vessels; Periodicals; 681.76041
• DOI: 10.1016/j.ijpvp.2016.03.013
• Languages: English
• ISSNs: 0308-0161

Abstract

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. Highlights: The rupture time and creep ductility found to decrease by increasing the percentage of pre-straining. The average and minimum creep strain rates found relatively insensitive to pre-compression. The creep ductility of the 4%, 8% and 12% PC materials followed the estimated trend for the AR material. Similar CCG behaviour was observed in the 4% and 8% PC specimens. 12% PC data provided a conservative estimate of the long term CCG behaviour in the AR material.