Glass-formation and corrosion properties of Fe–Cr–Mo–C–B glassy ribbons with low Cr content

Abstract

The effect of low amounts of Cr on glass forming ability and corrosion behavior of Fe (65-x) Cr x Mo 14 C 15 B 6 (x=0, 2, 4, 6, 8, 10 at.%) ribbons have been studied. It was found that the reduced glass transition temperature (T rg ) do not change significantly with Cr content. The glass forming ability (GFA) of this system is evaluated by the  m ,  and  parameters and the alloys containing 4 and 6 at.% were found to be the best glass formers in this system. The temperature interval of the supercooled liquid region (∆T x ) changed with Cr and was enlarged from 35 K at x=0 to 50 K at x=4. Corrosion rates measured by immersion tests in H 2 SO 4 decreased with an increase of chromium content in the alloys. The electrochemical measurements indicate that the alloys containing more than 4 at.% of Cr are spontaneously passivated with low current densities in 0.1 N H 2 SO 4 whereas the alloys with Cr content < 4 at.% showed active behavior. In view of these results, the optimal amount of Cr addition in Fe-Mo-C-B amorphous steels is discussed.

Newly-developed pseudo-high entropy amorphous alloys: Structure/microstructure evolution, mechanical and corrosion properties.

“…2a), it was observed a wide ΔTx window (41 • C), which can be associated with a higher stability of the amorphous phase and can also be promising for processing these alloys in this temperature range without losing the amorphous state [62,63]. Madinehei et al [64] showed that increasing Cr could positively affect GFA in traditional Fe-based amorphous alloys, enlarging the ΔTx window for a Fe-Cr-Mo-C-B system alloy. However, unlike the designed FeCrMoNbB PHE amorphous alloy, Cr amounts above 6% were found to have the opposite effect in those conventional Fe-based amorphous alloys.…”

Formation and investigation of the properties of FeWCrMoBC metallic glass coatings on carbon steel

“…МС и упрочняющие покрытия, сформированные из МС на основе железа, имеют повышенную твердость [8], повышенную износостойкость [1,9,10], более низкие коэффициенты трения [11], жаростойкость [12,13], коррозионную стойкость [2,[14][15][16] и другие свойства [17,18] относительно материала основы.…”

A Novel, Amorphous, Non-equiatomic FeCrAlCuNiSi High-Entropy Alloy with Exceptional Corrosion Resistance and Mechanical Properties

“…Recently, Al-Y-Ni MGs have been prepared, exhibiting a tensile fracture strength of more than 1000 MPa combined with good bend ductility; the tensile strength is almost two times as high as that of conventional Al-based crystalline alloys [4,5]. Fe-Cr-Mo-C-B system MGs have been sprayed as protective coatings on numerous prototypes and parts, exhibiting better corrosion and wear resistance than conventional stainless steels and Ni-based alloys [6][7][8]. These performances of MGs have been proven to be of fundamental scientific interest with potential applications including drilling, shipbuilding industry and petroleum industry because of their contrast with conventional crystalline metals.…”