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Wear behavior of H10A AISI/SAE steel nitrided by various methods

Yurtışık, Koray
Wear performance of salt-bath, vacuum, ion nitrided and duplex treated (nitrided and ceramic coated by physical vapor deposition technique) steel dies (H10A AISI/SAE) were studied. The dies were used for forging of steel pastes (52100 AISI/SAE) at 1050°C under 700 MPa for 0.3 - 0.4 seconds during production of bearing rings. The nitrided and un-nitrided dies were investigated via optical and scanning electron microscopy, x-ray diffraction and micro-hardness determination procedures. The service lives of dies were determined under real plant operation conditions. The nitriding and duplex treatment technologies improved the service life by 1.3 to 1.6-fold. The characteristics of layered microstructure on surface of the nitrided steel dies and effects of such layers on the wear phenomenon in hot forging operation and the tribological behavior of compound (white) layer and plasma vapor deposited ceramic coating were discussed.