Effect of ECAP Die Angle on Mechanical Properties and Biocompatibility of SS316L

Abstract

In this study, ultrafine grain (UFG) SS316L was produced using an equal channel angular pressing (ECAP) process at two different die angles namely 120° and 126°. The effect of different die angles on mechanical, corrosion, and surface properties were thoroughly investigated. Furthermore, the subsequent effect on the cytotoxicity of SS316L was investigated. The microstructure observation shows ECAP processing has produced an elongated, finer grain size at 120° than 126°. The ECAP processing also increases the hardness of SS316L. There is no change in wettability and surface roughness observed. However, the ectrochemical measurement reveals that ECAP processing improves the corrosion resistance of SS316L. The cytocompatibility of ECAPed SS316L was evaluated by both a direct and an extract methods, finding the contribution of grain refinement by ECAP processing.

An Overview on the Corrosion Behavior of Steels Processed by Severe Plastic Deformation

“…However, not always the corrosion behavior improves in stainless steels, because it also depends on the process and the nanostructured obtained (30,89) . For example, for 316L SS processed using ECAP, a significant improvement in the corrosion behavior has been reported, evidenced by the increase in the polarization resistance and decrease of corrosion rate, the increase in pitting corrosion potential, and the increase of the resistance of the passive film (90,91,92) . In contrast, Nagaraj et.al, studied the tribocorrosion behavior of steel 316L SS processed using ECAP and found a poor corrosion resistance of the treated samples, attributed to the strain accumulation from the ECAP process (93) .…”

Influence of ECAP process on mechanical, corrosion and bacterial properties of Zn-2Ag alloy for wound closure devices

“…Severe plastic deformation (SPD) is widely used to produce bulk ultrafine-grained (UFG) materials by introducing extremely large strain during the deformation process. Among them, equal channel angular pressing (ECAP) is an effective procedure to prepare UFG metals with excellent mechanical and corrosion properties [15,16] and to improve the biocompatibility of Mg alloys [17]. Concerning ECAP processing of Zn alloys different studies have been performed.…”

Effect of Rotary Swaging on Microstructure and Properties of Cr-Ni-Ti Austenitic Stainless Steel

“…This usually enhances mechanical and performance properties. The possibility of obtaining an ultrafine-grained (UFG) structure in austenitic corrosion-resistant steels is well known through various SPD methods such as equal channel angular pressing (ECAP) [1][2][3][4][5][6][7][8], high-pressure torsion (HPT) [9][10][11][12][13][14], accumulative roll bonding [15][16][17], and multidirectional forging [18][19][20]. These techniques result in improved mechanical and performance characteristics of the steels, making them more suitable for a wide range of applications.…”