The Effect of Milling Cooling Conditions on the Surface Integrity and Fatigue Behavior of the GH4169 Superalloy

Xu, Renjie; Zhou, Yue; Li, Xun; Yang, Shenliang; Kangning, Han; Wang, Shijun

doi:10.3390/met9111179

Cited by 13 publications

(4 citation statements)

References 21 publications

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“…The results show that the dual benefits of ultrasonic vibration and atomized cutting fluid significantly improve the surface integrity. Xu R et al [12] studied the surface roughness of GH4169 under side milling cooling conditions. The results show that there is little difference in surface roughness and plastic deformation layer depth between wet milling and dry milling.…”

Section: Introductionmentioning

confidence: 99%

Study on grinding surface quality of superalloy GH4145

zhao,

Gao,

Wang

et al. 2024

Preprint

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Nickl-based Superalloy GH4145 is widely used in aero-engine springs, blades, and other parts due to its excellent mechanical properties. It is a high-hardness and difficult-to-machine material. Improving the surface quality after processing has great significance for the long-term stable service of aero-engines. In this paper, Simulation models with different rake angles were established to predict the damage forms on the machined surface and subsurface on Abaqus. The effects of different process parameters on the surface quality of GH4145 were studied by using CBN grinding wheel. The influence of experimental parameters on the surface quality of GH4145 was analyzed and the related grinding mechanism was expounded. Under the scanning electron microscope (SEM) detection, the crack propagation process and the phenomenon of serious damage to the surface quality such as white layer were analyzed. The results show that the single particle prediction models with different rake angles can reflect the actual grinding situation to a large extent, and the model with the rake angle of -15° is more consistent with the detection phenomenon observed in this experiment. The surface damage forms are mainly pits, burrs, and boundary bosses caused by plastic deformation under simulation and experimental detection. The detection of the subsurface shows that in addition to the above phenomena, there are cracks and debris adhesion. The linear velocity of the grinding wheel is the main factor affecting the surface quality of the machined surface, the cutting depth is the second, and the feed rate has the least influence. The maximum roughness in the grinding experiment reaches 1.992 µm. Considering the thermal softening phenomenon of the material, the linear velocity range should be selected from 30 m/s to 35 m/s, and the feed rate and grinding depth should be selected relatively small values.

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Section: Introductionmentioning

confidence: 99%

Study on grinding surface quality of superalloy GH4145

zhao,

Gao,

Wang

et al. 2024

Preprint

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“…; special machining, such as electrical discharge machining (EDM), electrolytic machining, laser machining, etc. Traditional mechanical machining [1,2] method, the process is simple, but the tool manufacturing is difficult and requires high performance such as stiffness and strength of the tool, which generates a lot of heat during the machining process and can easily lead to problems such as tool wear and machining hardening thus affecting the machining quality. Special machining, which is a processing method that mainly uses electrical, thermal, optical, electrochemical and other energy to achieve the removal of materials, has a wide range of processing and good processing quality.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on waterjet guided laser cutting of nickel-based single crystal superalloy

Pan

Zhang

Guo

et al. 2022

Seventeenth National Conference on Laser Technology and Optoelectronics

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Conventional laser processing of metals will form serious heat affected zone, micro cracks, burrs and recast layer, resulting in rough machined surface and serious slag accumulation. As a new type of laser-waterjet composite processing method, waterjet guided laser can reduce or even eliminate heat affected zone, thermal crack, recast layer and burr. It has the advantages of high surface quality, strong depth ability and large depth-to-diameter ratio structure. Nickel-based single crystal superalloy is widely used in advanced aero-engine turbine blades for their excellent overall performance. With waterjet guided laser processing technology, this paper study the influence of process parameters on the grooving morphology and quality of DD6 nickel-based single crystal superalloy. A multi-factor study on the influence of laser power, laser repetition frequency, waterjet velocity and feeding speed on grooving was carried out with a self-developed waterjet guided laser processing device. The depth-to-width ratio and sidewall taper of the machined groove were measured and analyzed by using a three-dimensional confocal laser scanning microscope. The experimental results show that the grooves taper can be decreased with reducing the laser repetition frequency and increasing the laser power. The grooves large depth processing is improved by reducing the feeding speed, increasing the laser power, reducing the laser repetition frequency and increasing the waterjet velocity. The cutting experiment of 1 mm DD6 nickel-based single crystal superalloy was achieved with better processing process parameters, and it was found that the upper and lower surface roughness of the cutting surface was inconsistent, providing a theoretical basis for the study of high quality processing of nickel-based single-crystal superalloy by waterjet guided laser.

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“…Nickel-based superalloys (GH738 (Chinese code)) are extensively used as the blades and disks of industrial jet engines and gas turbines due to their excellent properties such as fatigue properties [ 1 , 2 ], hot corrosion resistance [ 3 , 4 , 5 , 6 , 7 ], and oxidation resistance at elevated temperatures [ 8 , 9 , 10 , 11 ]. However, these alloys degrade during the long-term service in harsh environments.…”

Section: Introductionmentioning

confidence: 99%

The Effects of Grain Size and Twins Density on High Temperature Oxidation Behavior of Nickel-Based Superalloy GH738

Luo

Yang

2020

Materials

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In the present study, surface treatment techniques such as room temperature machining (RTM) and low temperature burnishing (LTB) processing have been used to improve the microstructure of GH738 superalloy. Nano-grains and nano-twins are obtained on the top surface of RTM and LTB specimens. It is found that although the grain size of RTM and LTB specimens is almost the same, different types of nano-twins have been produced. Moreover, the effect of RTM and LTB processing on high temperature oxidation behavior of nickel-based superalloy GH738 at 700 °C is investigated. The result shows that LTB specimen has the best high temperature oxidation resistance owing to the formation of nano-grains and higher twins density, which induce to form a continuous protective Al2O3 layer at the interface between outer oxide layer and matrix. It is observed that this layer inhibits the inward diffusion of O and outward diffusion of Ti and significantly improves oxidation resistance of LTB specimen. Furthermore, the effects of nano-grains and crystal defects on the diffusion mechanism of elements are clarified during the high temperature oxidation test.

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The Effect of Milling Cooling Conditions on the Surface Integrity and Fatigue Behavior of the GH4169 Superalloy

Cited by 13 publications

References 21 publications

Study on grinding surface quality of superalloy GH4145

Study on grinding surface quality of superalloy GH4145

Experimental study on waterjet guided laser cutting of nickel-based single crystal superalloy

The Effects of Grain Size and Twins Density on High Temperature Oxidation Behavior of Nickel-Based Superalloy GH738

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