Effect of machining on the stress corrosion cracking behavior in boiling magnesium chloride solution of austenitic stainless steel

Abstract

The stress corrosion cracking (SCC) behaviors of Z3CN20.09M, 304L, and 316L austenitic stainless steels (SSs) after milling operation in boiling magnesium chloride solution were investigated by scanning electron microscopy (SEM), X‐ray diffraction, and 3D profilometer. The experimental results indicated that the roughness and residual stress increased with increasing feed rate of all specimens. The depth of deformation layer after milling operation reached about 150 µm shown as persistent slip bands (PSBs) were formed, leading to hardness enhanced obviously. After SCC tests in boiling magnesium chloride solution, the crack densities increased with increasing feed rate of the Z3CN20.09M SS specimens. However, the crack densities decreased as well as the intergranular (IG) cracking percentages increased with increasing feed rate of the 304L and 316L SS.

Effect of residual stress on the stress corrosion cracking in boiling magnesium chloride solution of austenite stainless steel

“…The strength of ferrite was higher than austenite when the composition and manufacture technology were similar, so the crack propagation was often postponed by ferrite . In our previous study, the postponed cracks were observed at the milled surface, and the similar phenomenon was also observed at the cross section of deformation layer.…”

“…In boiling magnesium chloride solution condition, the cracking often occurred intracrystalline, while the IG cracking was aroused after milling operations, as mentioned previously . This could be attributed to the damage effect on the grain boundary was revealed with increasing the feed rate during milling operation, as indicated in our previous study.…”

“…At last, the effect of annealing treatment on IG corrosion susceptibility of all specimens was studies by double loop electrochemical potentiokinetic reactivation (DL‐EPR) tests. It is worth mentioning that we have published a paper focusing on the effect of milling operation on SCC behavior of the SSs, and the present study is a follow‐up study.…”

Gradient Boosted Trees Predictive Models for Surface Roughness in High‐Speed Milling in the Steel and Aluminum Metalworking Industry

“…There are several parameters to establish the surface roughness value. The surface roughness average is the most widely used in the industry thanks to the ease with which it can be assessed (generally after processing) and the closeness with which it represents the surface texture of the mechanized part [32,33].…”

Stress Corrosion Cracking Behaviour of Dissimilar Welding of AISI 310S Austenitic Stainless Steel to 2304 Duplex Stainless Steel

“…SCC is the main corrosion failure mode for 310S stainless steels and it is characterized by the slow nucleation and propagation of cracks on the material under the synergic interaction of mechanical tension and a specific corrosive environment [3,4]. In general, the nucleation of stress corrosion cracks occurs at stress levels below the yield stress of the materialand SCC full failure could occur at stresses below the material's ultimate tensile strength [4][5][6][7].…”