Effect of nitrogen on high temperature low cycle fatigue behaviors in type 316L stainless steel

Crystal interstitial sites contribution to nitrogen supersaturation in mechanically alloyed Fe–Cr–Mn–N alloys

“…The lattice parameter of the ␣-and ␥-phases after the Rietveld refinement of the XRD data and also the dissolved nitrogen contents calculated from Eqs. (2) and (3) are listed in Table 3. Using the relative content of the ␣-and ␥-phases presented in Table 2 and considering the linear combination of these two phases in the interstitial nitrogen distribution, the average dissolved nitrogen content in the crystal interstitial sites (N int ) is also tabulated in Table 3, i.e.…”

“…It is well established that the nitrogen addition to stainless steels has advantageous effects on their mechanical properties [1][2][3][4][5] and corrosion resistance [5][6][7]. Nitrogen in stainless steels is strong austenite stabilizer and biocompatible; therefore, it is capable of being a replacement for nickel which is expensive and toxic.…”

Spatio-temporal characteristics of the Portevin–Le Châtelier effect in austenitic steel with twinning induced plasticity

“…During this wait period, the pinned dislocations can be ''aged" by clouds of solute atoms that diffuse to the dislocation cores under appropriate temperatures and strain rates (Cunningham, 1999). For steels, a common explanation for DSA involves reaching a critical strain to produce adequate vacancies that allow C diffusion to pinned dislocation cores (Chen et al, 2007;Owen and Grujicic, 1998;Kim et al, 1998;Cunningham, 1999). An alternate mechanism based upon vacancy diffusion was detailed by de Almeida et al (1998) as a result of elevated temperature ($200-800°C) tensile tests of austenitic steels with no significant Mn content.…”

Aços inoxidáveis duplex: uma breve visão

“…Samuel, Ray e Sasikala (2006) constataram recentemente que a resistência à fratura dúctil de um aço inoxidável 15Cr-15Ni Ti-modificado era melhorada, quando observado o DSA (SAMUEL; RAY; SASIKALA, 2006). Além disso, o trabalho a frio, em que ocorre DSA, tem sido mais eficaz no fortalecimento do sistema austenítico do que pelo seu uso tradicional, devido ao aparecimento e à melhor propagação de discordâncias (PENG; QIAN;CHEN, 2004 (KIM et al, 1998), quanto para a fase CCC (GUPTA et al, 2000), o efeito só é causado, quando outros elementos estão presentes. Por exemplo, o Al (TJONG; ZHU, 1997), Ti (VENKADESAN et al, 2000), Cu (WU;LIN, 2005), Mo e Ni (ANGLADA; NASARRE; PLANELL, 1987) também são causadores de DSA.…”