Fatigue performance of surface ground and wire electrical discharge machined TiNi shape memory alloy
نویسندگان
چکیده
Fatigue performance is a major consideration for critical aerospace components. The influence of surface grinding and rough/finish wire electrical discharge machining (WEDM) on the high cycle fatigue binary Ti 50.8 -Ni 49.2 shape memory alloy was assessed. effect machined workpiece integrity in terms roughness subsurface microhardness results also evaluated, addition to fractography analysis. Testing performed using tensile-tensile regime at an elevated temperature 150°C with specimens austenitic phase. Ground samples showed highest strength 390 MPa run-out 1.2 × 10 7 cycles, while finish rough WEDM were 21% 57% lower respectively, despite surfaces having significantly roughness. This likely due presence tensile residual stresses following WEDM. All S-N curves however exhibited relatively flat response no clear indication endurance limits. implies that different processes/conditions affected material, but not overall trend/shape curves.
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ژورنال
عنوان ژورنال: Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture
سال: 2021
ISSN: ['2041-2975', '0954-4054']
DOI: https://doi.org/10.1177/09544054211028844