Abstract
The GH4169 superalloy has high strength at high temperatures. Cooling conditions have a major impact on the machined surface integrity, which further affects the fatigue properties of specimens of the GH4169 superalloy. The influence of cooling conditions on the surface integrity of the GH4169 superalloy is first studied during the side milling. Then, the effect of surface integrity under different cooling conditions on the fatigue behavior of specimens of the GH4169 superalloy is investigated by a standard tensile and tensile–mode fatigue testing. The results obtained show that surface roughness and the depth of the plastic deformation layer in wet milling and dry milling makes little difference, the surface microhardness rate in dry milling is slightly lower than that in wet milling, the surface tensile residual stress in dry milling is significantly higher than that in wet milling, and the fatigue behavior in dry milling is only about 50% of that in wet milling. In addition, the crack initiation of specimens of the GH4169 superalloy utilizing wet milling is on the subsurface, while that from dry milling is on the surface. Thus, cooling conditions have an important impact on the fatigue behavior of specimens of the GH4169 superalloy, and micro defects in dry milling are the main factors of decreasing of fatigue behavior of specimens of the GH4169 superalloy.
Highlights
The GH4169 superalloy has been widely used in aerospace, aviation, and other industries due to its excellent properties [1,2,3,4,5]
Due to the lack of cooling of the cutting fluid, the tool rake face adhered to processed chips, which attach to the surface of specimens of the GH4169 superalloy, and was softened or even liquefied at high temperature during subsequent processing [20]
Cooling conditions have a direct impact on the surface integrity of the milled GH4169 superalloy
Summary
The GH4169 superalloy has been widely used in aerospace, aviation, and other industries due to its excellent properties [1,2,3,4,5]. The results showed that the surface integrity was significantly affected by tool flank wear, and the tool life of conventional cooling was longer than that of cryogenic. Pereira et al [12] investigated the influence of CryoMQL_CO2 (cryogenic machining using minimum quantity of lubrication and carbon dioxide) and dry machining on the tool wear and surface integrity of AISI 304 in turning. Pereira et al [13] studied the effect of different cooling conditions on the GH4169 superalloy of milling, and pointed out that the tool life of wet machining, internal. Based on the experimental results, fatigue behavior and surface integrity (such as surface roughness, surface topography, surface microhardness rate, surface residual stress, and microstructure) were further studied under different cooling conditions in this paper
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