Evaluation of the effect of nitrogen on creep properties of 316LN stainless steel from impression creep tests

Effect of Nitrogen Content on Hot Deformation Behavior and Grain Growth in Nuclear Grade 316LN Stainless Steel

“…Nitrogen alloying enriched the chromium within the passive film [4]. In terms of mechanical properties, the steady state creep rate decreased significantly with increasing nitrogen content [5,6], and a similar phenomenon was also found in impression creep tests [7,8]. When the N content was no more than 0.14%, 316LN stainless steel with higher N content showed better crack growth resistance at ambient [9] and high temperature [10].…”

Study on creep deformation mechanism of 316LN stainless steel from impression creep tests

“…where, v imp /D is the steady state impression velocity normalised to the diameter D of the punch which represents the uniaxial steady state strain rate, 8 A 2 is the constant, s imp is the punching stress, n is the power-law exponent, Q c is the apparent activation energy for rate controlling process, R is the universal gas constant and T is the absolute temperature. The apparent activation energy was calculated from Fig.…”

“…The corresponding punching stress s imp was calculated as s imp~4 L=pD 2 . 8 During the test, the depth of penetration (h) of indenter into the test specimen was measured as a function of elapsed time. Impression creep tests were performed in vacuum of~10 26 mbar in order to avoid oxidation of the specimen surface.…”

“…[4][5][6] In recent years, the impression creep technique has found applications for the development of new creep resistant materials. In order to optimise the nitrogen content in 316LN stainless steel (SS), systematic studies on impression creep behaviour of 316LN SS containing nitrogen in the range 0?07-0?22 wt-% have been carried out at 923 K. 7,8 The aim of the present investigation is to study the creep deformation mechanism of 316L(N) SS.…”

Study of the processing map and hot deformation behavior of a Cu-bearing 317LN austenitic stainless steel

“…As a kind of surgical implant material, 317LN austenitic stainless steel has been widely used in clinical applications because of its excellent combination of mechanical properties, pitting and crevice corrosion resistance ability [1][2][3]. However, the surgical implants and medical devices are prone to induce bacterial adhesion, which can often cause post-surgical implant and/or device related bacterial infections leading to high risk of implant failures hence posing serious health risks to patients and massive financial burden to healthcare systems.…”