Nitrogen mass transfer and surface layer formation during the active screen plasma nitriding of austenitic stainless steels

Abstract

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Laser Surface Alloying of Austenitic 316L Steel with Boron and Some Metallic Elements: Properties

“…The samples, subjected to LTPGN process, were tested using the “block-on-ring” technique with AISI 52100 steel as a ring-shaped counter-sample [ 2 , 3 ], “ball-on-disc” method using AISI 52100 steel [ 5 , 9 ] or Al 2 O 3 [ 7 ] in the shape of ball as a counter-sample or “pin-on-disc” technique using AISI 1045 steel as a counter-sample in the shape of pin [ 8 ]. Unfortunately, in the case of very interesting technique of LTPGN using an active screen [ 10 , 11 , 12 , 13 ] the wear resistance of the layers was not studied. The effects of HTPGN process on the tribological properties of austenitic steel were tested using “block-on-ring” [ 3 ] or “ball-on-disc” [ 5 , 15 ] techniques using the counter-specimen made of AISI 52100 steel in the shape of ring [ 3 ] or ball [ 5 ] as well as sapphire ball [ 15 ], respectively.…”

“…Therefore, the only way to harden such a steel is via adequate surface treatment in order to produce hard and wear resistant surface layers. It is relatively easy using the physical techniques of surface treatment, especially if the surface is saturated with nitrogen, carbon or boron under glow discharge conditions [ 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 ]. Such techniques are also called plasma or ion processes [ 32 ].…”

S-Phase Layer Development on 316 LVM Using Low Temperature Hybrid Thermochemical Treatment Process

“…Specimens 425HP6H, 425HP12H and 475HP6H presented a gradual increase with respect to thickness which were 282.6 HV 0.05, 336.1 HV 0.05 and 521.5 HV 0.05 respectively. The extreme hardness in s-phase can be attributed to the high concentration of carbon introduced by diffusion process to the austenite phase [11][12] [13]. The microhardness increases as the temperature increases.…”

Surface Morphology Analysis of Martensitic Stainless Steel after Different Treatments

“…Material engineering is a field of science used on a large scale [1][2][3][4][5][6][7], especially surface engineering [8][9][10][11][12][13][14][15][16][17][18][19][20]. Increasingly, attempts are made to modify the surface layer by various methods, and in particular nitriding is widely used [9,10,[12][13][14][15][16][17][18][19][20]. In paper [8], the spray-formed Al alloy was selected for testing.…”

“…Moreover, the metallurgical bonding was very well improved by the electron beam remelting process due to the elimination of the pores caused by nitriding. In paper [10] modification were made in Al alloy. On this alloy, the layer was prepared through the deposition of Ti film by magnetron sputtering ion plating system.…”