Mechanical Properties and Corrosion Resistance of SA508-4 Low Carbon Alloy Steel

Abstract

The mechanical properties and corrosion resistance of SA508-4Ni-Cr-Mo low carbon alloy steel are elucidated using tensile testing, Charpy impact testing, fracture surface analysis and in-situ electrochemical noise (EN) technique. The metallographic structures are characterized by metallographic microscope combining with transmission electron microscope (TEM), and the fracture morphology is characterized by scanning electron microscope (SEM). The intercritical heat treatment (IHT) is introduced to heat the SA508-4 steel. The experimental observations reveal that the metallographic structure of SA508-4 steel is fine and uniform after different heat treatment, with martensite and lower bainite structures. The strength and toughness of SA508-4Ni-Cr-Mo are confirmed higher than that of SA508-3Mn-Ni-Mo steel used for reactor pressure vessels (RPV) at present. The IHT decreases the yield strength and toughness. EN results show that the noise resistance of SA508-4 steel decreased with the elevated temperature from 27 to 250°C, illustrating the passivity degradation of SA508-4 induced by the elevated temperature.

Shape optimization of energy storage flywheel rotor

“…The related parameters of the integrated flywheel are given in Table 1. SA508-4Ni-Cr-Mo low carbon alloy steel is taken as the flywheel material (Xia et al 2013). …”

Damage-coupled ratcheting behaviors of SA508 Gr.3 steel at room and elevated temperatures: Experiments and simulations

“…(2016). Besides, the fracture toughness, corrosion resistance, creep rupture, and fatigue behaviors for SA508 Gr.3 steel were also reported (Jang etal., 2013; Liu etal., 2017; Lu etal., 2018; Xia etal., 2013; Yang etal., 2018). However, there are few literatures paying attention to the ratcheting behaviors of SA508 Gr.3 steel.…”

Detection of SCC on 304 stainless steel in neutral thiosulfate solutions using electrochemical noise based on chaos theory

“…EN indicates a change in the thermodynamic and kinetic states of the interface, and it is one of the electrochemical techniques that does not disturb the system (Xia et al , 2012c), and it can be used to monitor the corrosion form and corrosion rate of metal materials. The corrosion and corrosion-related processes identified as sources of EN include, among others, the initiation and propagation of stress corrosion cracks (Du et al , 2011; Breimesser et al , 2012); hydrogen bubble nucleation, growth and detachment (Szenes et al , 2007); passive film formation and growth (Xia et al , 2013a, 2013c); nucleation, growth and propagation of pits (Zhang et al , 2012); abrasion corrosion (Thakare et al , 2009); high temperature corrosion (Macak et al , 2006; Xia et al , 2013c); microbial corrosion (Zaveri et al , 2007); degradation of organic coatings (Zhou et al , 2013; Xia et al , 2012b); and uniform corrosion (Xia et al , 2012a). With the fast development of electronic techniques and modern signal processing methods, EN has been regarded as the preferred electrochemical methods to detect the SCC process.…”