Region | optimal parameter conditions | Predicted SN ratio | |
Wear volume | Microhardness | ||
| A1B | −42.609 db | −18.005 db |
| A1B | −44.068 db | −17.689 db |
| A1B | −44.814 db | −17.551 db |
| A1B | −45.591 db | −17.429 db |