Effect of sub-zero treatments on hardness and corrosion properties of low-alloy nickel steel

Abstract

<abstract><p>Low alloy nickel steel was chosen for this experiment because it is suitable for grinding balls application due to its high hardness and corrosion resistance. This study aimed to see the effect of different sub-zero treatments on the hardness, fractography and corrosion properties of low alloy nickel steel. The prepared specimens were heated to the austenitizing temperature of 980 ℃ in a furnace for one hour and water-quenched until they reached room temperature. Furthermore, the quenched specimens were chilled in liquid nitrogen for a variated time of 10, 60 or 360 min, followed by tempering treatment at 200 ℃ for one hour. According to the hardness test, the sub-zero treatment is effective in hardening materials, where the hardness value increases as the sub-zero treatment time increases, ranging from 204.93 to 417.98 HV. The fractography test indicated ductile fracture characterized by dimples at the fractured surface. Moreover, the corrosion test showed an enhancement of corrosion resistance with increased sub-zero treatment time.</p></abstract>

Comparative analysis of MgB2 superconducting wire for various cooling treatments through a sintering process

“…Several studies have investigated the effect of cooling treatment on the properties of MgB2 wires. For instance, Shcherbakova et al reported that to obtain the best superconducting properties for pure IOP Publishing doi:10.1088/1757-899X/1291/1/012019 2 and MgB2 wires with SiC addition, cooling rates must be considered and will affect to mechanical properties [4][5] [6]. The objective of this research is to study the effect of the cooling method after the hot rolling process to form a single-phase superconducting MgB2 with minimal oxides to characterize its microstructure and hardness properties for the wire drawing process.…”

Development and Performance of High Chromium White Cast Irons (HCWCIs) for Wear–Corrosive Environments: A Critical Review

“…Material loss via wear is encountered in many processes, from earth movement, mining, mineral processing, slurry pumping, and machinery parts exposed to friction. Sometimes, the material under wear is also exposed to low pHs in an aqueous environment, for example, during wet grinding of sulfidic or phosphate ores and heavy pumping of acidic slurry containing hard particles [1][2][3]. It has been observed in studies by Jones [4] and Chelgani et al [5] that combined wear-corrosion occurs even in neutral water during grinding in the presence of aeration.…”