Formation of Expanded Austenite on a Cold-Sprayed AISI 316L Coating by Low-Temperature Plasma Nitriding

2015 ◽  
Vol 24 (8) ◽  
pp. 1399-1407 ◽  
Author(s):  
Shinichiro Adachi ◽  
Nobuhiro Ueda
Keyword(s):  
Low Temperature ◽  
Plasma Nitriding ◽  
Aisi 316L ◽  
Low Temperature Plasma ◽  
Temperature Plasma ◽  
Expanded Austenite

scholarly journals Low temperature plasma carburizing of AISI 316L austenitic stainless steel and AISI F51 duplex stainless steel

2013 ◽  
Vol 66 (2) ◽  
pp. 209-214 ◽  
Author(s):  
Carlos Eduardo Pinedo ◽  
André Paulo Tschiptschin
Keyword(s):  
Stainless Steel ◽  
Low Temperature ◽  
Duplex Stainless Steel ◽  
Aisi 316L ◽  
Low Temperature Plasma ◽  
Temperature Plasma ◽  
Carbon Carrier ◽  
316L Austenitic Stainless Steel ◽  
Expanded Austenite ◽  
Plasma Carburizing

In this work an austenitic AISI 316L and a duplex AISI F51 (EN 1.4462) stainless steel were DC-Plasma carburized at 480ºC, using CH4 as carbon carrier gas. For the austenitic AISI 316L stainless steel, low temperature plasma carburizing induced a strong carbon supersaturation in the austenitic lattice and the formation of carbon expanded austenite (γC) without any precipitation of carbides. The hardness of the carburized AISI 316L steel reached a maximum of 1000 HV due to ∼13 at% carbon supersaturation and expansion of the FCC lattice. For the duplex stainless steel AISI F51, the austenitic grains transformed to carbon expanded austenite (γC), the ferritic grains transformed to carbon expanded ferrite (αC) and M23C6 type carbides precipitated in the nitrided case. Hardness of the carburized case of the F51 duplex steel reached 1600 HV due to the combined effects of austenite and ferrite lattice expansion with a fine and dispersed precipitation of M23C6 carbides.

scholarly journals Effect of Low-Temperature Plasma Nitriding on Corrosion and Surface Properties of Duplex Stainless Steel UNS S32205

2020 ◽  
Vol 29 (4) ◽  
pp. 2612-2622
Author(s):  
Yamid E. Núñez de la Rosa ◽  
Oriana Palma Calabokis ◽  
Paulo César Borges ◽  
Vladimir Ballesteros Ballesteros
Keyword(s):  
Stainless Steel ◽  
Low Temperature ◽  
Duplex Stainless Steel ◽  
Surface Properties ◽  
Plasma Nitriding ◽  
Low Temperature Plasma ◽  
Temperature Plasma

Dry Progressive Stamping of Copper-Alloy Snaps by the Plasma Nitrided Punches

2018 ◽  
Vol 920 ◽  
pp. 28-33 ◽  
Author(s):  
Tatsuhiko Aizawa ◽  
Hiroshi Morita
Keyword(s):  
Low Temperature ◽  
Plasma Nitriding ◽  
Life Time ◽  
Ceramic Coatings ◽  
Low Temperature Plasma ◽  
Micro Structure ◽  
Temperature Plasma ◽  
Stamping Die ◽  
Wear And Friction ◽  
Die Set

The dry progressive stamping was strongly required to make mass production of clothing parts and beverage cans. The duplex coating was one of the most reliable means to protect the dies and punches from wear and friction and to prolong their life time. In this coating, the die and punch was first surface-treated to have sufficient hardness in compatible to the hard ceramic coatings. In the present study, the low temperature plasma nitriding at 673 K was employed to harden the six kinds of punches and dies for progressive stamping of copper alloyed fucks. The micro-structure and nitrogen mapping were investigated by SEM with EDS to demonstrate that the hardening took place by nitrogen super saturation into SKD11 matrix without nitride precipitations. These nitrogen super-saturated punches and dies were fix into the progressive die set for dry stamping. No significant wear of tools as well as reduction of stamping loads even after a million shots proved that the low temperature plasma nitriding should be suitable to make hardening of dry stamping die substrates even without use of hard ceramic coatings.

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