Abstract
In this paper, the dry-sliding wear properties of SKD 11 and SKH 9 under conditions of high pressure and low velocity are discussed; these samples are industrially utilized as mold forming materials in cold forming. Particularly, these alloy steels were used as stators, while sulfurized or phosphated low carbon steels were used as rotors cooperating with the side stators.
The results showed that in the range of contact pressure of 500-1500kg/cm2 and sliding velocity of 0.05-1.00m/sec., the surface layers of phosphated rotors broke away at their earlier stage of wear, which resulted in metal transfer due to adhesion.
Whereas, little adhesion was observed on the sulfurized rotors. A part of porous sulfurized layers spalled away as wear powder, which adhered to the sliding surface of counter experimental piece. Then, the wear loss between the two sulfurized layers grew remarkably less.
It was also observed that when the wear ratio varied in the velocity-wear property curve, the wearing mechanisms were nearly identical with those mentioned above.
It was further observed that the wear of underhardened material was slightly larger than that of ordinarily quenched and tempered one, because the hardness of the former was much lower than that of the latter.
