Surface Hardening ( DC-Plasma Nitrocarburizing)

SURFACE HARDENING AT MATERIAL MEDIUM CARBON STEEL            ( DISC BRAKE ) USING DC-PLASMA NITROCARBURIZING AT TEMPERATURE (700-900)°C
Pratomo.N , Nuryanto.J ,Nurhidayatulloh, Soeharyadi, ramadani, A. rahman, Dhuto. G, Setiawan. H , Sudjianto.
Fakultas Teknik Mesin/Universitas Mercubuana

ABSTRACT

Surface hardening at medium carbon steel type disk brake using plasma nitrocarburizing at temperature (700-900)°C has done with holding time 240 minute. The surface of Medium carbon steel  was coated with nitrogen and carbon atoms and diffused in disc brake material  in order to produce hard layer and worn down proof, to know matrix compiler accretion in that material, and also to measure plasma nitrocarburizing layer deepness. Deepness that produced by plasma nitrocarburizing layer at temperature 700°C, 800°C,and 900°C those are 0,00mm , 0,012mm and, 0,32mm. Plasma nitrocarburizing at temperature 700°C or more can effect matriks compiler of medium carbon steel accretion which is in the first (room temperature) two matriks and in the last become three matriks,  whereas the hardness values that is effected by plasma nitrocarburizing at temperature 700°C , 800°C and 900°C successively those are 210,20 Kgf/mm²,220,58 Kgf/mm² and 766,11 Kgf/mm². This case has showed that hardness value will increase along with temperature increasing at plasma nitrocarburizing process.

Keyword : Medium carbon steel, Plasma nitrocarburizing, Temperature, Micro structure,    Surface Hardening

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