Deformation effects on the interface between X2CrNi 19 11 stainless steel and HIPed NiTi coating in machining
نویسنده
چکیده
This study investigated the deformation effects of the interface between conventionally produced stainless steel X2crNi 19 11 and HIPed NiTI coating (Hot Isostatic Pressed). Near-equiatomic nickel-titanium alloy (NiTi) has many attractive material properties, such as pseudo-elasticity and shape memory effects, which result into beneficial engineering properties e.g. as cavitation resistant coatings in addition to its well-known shape memory properties. Stainless steels are often considered to be poorly machinable materials; materials with high elasticity are also difficult to machine. In drilling stainless steel with a pseudo-elastic coating material, machinability difficulties are caused by the high strength and work hardening rate of steel and the pseudo-elastic properties of the coating material. The deformation effects were studied by analyzing cemented carbide drills and chips. The interface between stainless steel and NiTi coating was examined with SEM (Scanning Electron Microscopy) and EDS (Energy Dispersive Spectroscopy) analysis. The effect of feed rate on chip formation was analyzed. The cutting tests indicated that cutting speeds of 50 m/min, a feed rate of 0.1-0.2 mm/rev, and solid carbide drills can be applied, from a machinability standpoint. A HIPed pseudo-elastic coating decreases machinability. When effective cutting speeds and feed rates were utilized, optimal tool life was achieved without severe decrease in coating properties.
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