The influence of the content of certain incidental elements on the cyclic oxidation resistance of 12–13% chromium steels

High-Temperature Corrosion Characteristics of Ni-20Cr-xSi Alloy Laser Cladding Layer in NaCl-KCl-Na2SO4-K2SO4 Mixed Salt Environment

“…Laser-cladding layers of Ni-Cr-Si alloys with different Si contents were prepared using the laser-cladding-layer technique. It has been shown that the addition of Si enhances the oxidation and corrosion resistance of the alloys even if the addition is not sufficient to form a continuous SiO 2 layer [15][16][17]. The Si content of most of these studies is below 5 wt.%.…”

Intergranular Oxidation of Additively Manufactured Ni-Base Alloy 625: The Role of Si

“…The beneficial effect of Si on the oxidation behavior of chromiaforming high-temperature alloys has been known for a long time [67,68]. Depending on the Si concentration and temperature, alloying with silicon promotes two basic scenarios: formation of a continuous SiO 2 subscale [69][70][71] or internal precipitation [68,72,73].…”

“…The beneficial effect of Si on the oxidation behavior of chromiaforming high-temperature alloys has been known for a long time [67,68]. Depending on the Si concentration and temperature, alloying with silicon promotes two basic scenarios: formation of a continuous SiO 2 subscale [69][70][71] or internal precipitation [68,72,73]. Even when the alloying level of Si is insufficient to produce a continuous SiO 2 layer, the beneficial effect of Si addition on the oxidation rate is evident [68,69,72,73,74].…”

“…Depending on the Si concentration and temperature, alloying with silicon promotes two basic scenarios: formation of a continuous SiO 2 subscale [69][70][71] or internal precipitation [68,72,73]. Even when the alloying level of Si is insufficient to produce a continuous SiO 2 layer, the beneficial effect of Si addition on the oxidation rate is evident [68,69,72,73,74]. The following key mechanisms of the Si effect have been discussed in the literature: i) crystalline or amorphous silica is generally believed to serve as a diffusion barrier impeding the outward transport of Cr cations [70,72,73,75]; ii) Si enhances interdiffusion of Cr in Ni-Cr [75], which found a confirmation in thermodynamic modelling of the diffusion matrix in [65]; iii) SiO 2 precipitates provide additional nucleation cites for Cr 2 O 3 [72] and suppress transient oxidation [76].…”