Enhancement of intergranular corrosion resistance of type 304 stainless steel through laser shock peening

Abstract

The present experimental study evaluates laser peening for suppressing intergranular corrosion (IGC) susceptibility of sensitised 304 stainless steel. Under the given experimental conditions, an increase in the number of laser peening treatments of sensitised 304 stainless steel specimen brought about progressive reduction in its susceptibility to IGC. Triple laser peening of sensitised stainless steel specimen introduced remarkable reduction in its IGC susceptibility. The results of the study suggest that breakage of inter-granular network of chromium carbides/chromium-depleted regions through plastic deformation, imposed by multiple laser peening treatment, was responsible for causing significant suppression in IGC susceptibility of sensitised 304 stainless steel specimens.

Peening Techniques for Surface Modification: Processes, Properties, and Applications

“…Many researchers have experimentally proved that laser-assisted peening process is superior in obtaining properties like increased wear resistance [ 21 , 24 , 26 , 31 ], improved hardness [ 21 , 24 , 25 , 26 , 27 , 28 , 30 ], increased fatigue life [ 23 , 26 ], enhanced corrosion resistance [ 20 , 22 , 32 ], increased yield strength [ 23 , 27 , 30 ], improved surface roughness [ 20 , 24 , 26 , 31 ], and refined microstructure [ 25 , 27 , 28 ] in metals and alloys. Researchers demonstrated many materials that are successfully peened using LSP techniques including, but not limited to aluminum alloys [ 21 , 23 , 24 ], different steel grades [ 20 , 22 , 27 , 32 ], titanium alloys [ 16 , 17 , 25 ], magnesium alloys [ 28 ], ceramics [ 29 ], super alloys [ 30 ], and brass [ 31 ]. Recently, LSP techniques have been widely applied as a method for post-processing of welds [ 105 ] and on additively manufactured (AM) components [ 106 ].…”

“…LSP primarily involves the interaction of high-power density lasers with substrates. In the past, researchers conducted innovative studies using LSP experiments on metals and alloys that are prominently used in marine applications [ 19 , 20 , 21 , 22 ], aerospace [ 23 , 24 , 25 , 26 ], medical [ 27 , 28 , 29 ], and industry [ 30 , 31 , 32 ]. These studies demonstrated the impact of various LSP parameters on mechanical properties and microstructural features.…”

Effect of Laser Peening on the Corrosion Properties of 304L Stainless Steel

“…Corrosion properties by surface modification have recently been studied as follows: Shot peening on the corrosion of aluminum alloy [ 19 , 20 ] and the corrosion properties of stainless steel [ 21 , 22 ]; laser peening on the corrosion of Alloy 600 [ 23 ], the corrosion of 304 stainless steel [ 24 ], the corrosion of stainless steels [ 25 , 26 , 27 , 28 , 29 ], the corrosion of aluminum alloy [ 30 ], and the corrosion of magnesium alloy [ 31 ]; UNSM on the corrosion of nickel base alloys [ 32 , 33 , 34 ] and the corrosion of stainless steels [ 35 , 36 , 37 , 38 ]; and comparison between laser peening, shot peening, and ultrasonic peening [ 8 ]. Most recent research efforts on surface modification methods have shown beneficial effects on the corrosion of various alloys [ 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 ]. In some cases, detrimental effects of surface modification methods can be induced.…”

Laser surface melting of 304L SS: increase in resistance to transpassive dissolution and pitting corrosion

“…Laser has emerged over decades as a novel surface modification tool for metals and alloys [1][2][3][4]. Among different laser treatment techniques, laser surface melting (LSM) is becoming increasingly useful for a variety of engineering applications [5][6][7].…”