Poor machinability with conventional machining processes is a major shortcoming that limits the manufacture of NiTi components. To better understand the effects of phase state on the machining performance of NiTi alloys, cutting temperature, tool-wear behavior, cutting force components, tool-chip contact length, chip thickness, and machined surface quality data were generated from a NiTi alloy using precooled cryogenic, dry, minimum quantity lubrication (MQL), and preheated machining conditions. Findings reveal that machining NiTi in the martensite phase, which was achieved through precooled cryogenic machining, profoundly improved the machining performance by reducing cutting force components, notch wear, and surface roughness. Machining in the austenite state, achieved through preheating, did not provide any benefit over dry and MQL machining, and these processes were, in general, inferior to cryogenic machining in terms of machining performance, particularly at higher cutting speeds.
|Number of pages||12|
|Journal||Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science|
|State||Published - Jun 1 2015|
Bibliographical noteFunding Information:
Support from the NASA EPSCOR Program under Grant No. NNX11AQ31A and the NASA FAP Aeronautical Sciences and TACP Transformational Tools & Technologies Projects (Dale Hopkins, Technical Lead) are gratefully acknowledged.
© 2015, The Minerals, Metals & Materials Society and ASM International.
ASJC Scopus subject areas
- Condensed Matter Physics
- Mechanics of Materials
- Metals and Alloys