TY  - JOUR 
T1  - Metallurgical response of an AISI 4140 steel to different plasma nitriding gas mixtures
JO  - Materials Research
A1  - Skonieski, Adão Felipe Oliveira
A1  - Santos, Giovanni Rocha dos
A1  - Hirsch, Thomas Karl
A1  - Rocha, Alexandre da Silva
SN  - 1516-1439
UL  - 10.1590/S1516-14392013005000073
VL  - 16 
Y1  - 2013
PB  - Brazil 
ER  -