Surface quality investigation of turbine blade steels for turning process

Kiran, C. Phaneendra; Clement, S.

doi:10.1016/j.measurement.2012.12.022

Cited by 14 publications

(5 citation statements)

References 28 publications

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“…Hard turning in dry condition using cubic boron nitride (CBN) tool, as an alternative of traditional turning-grinding processes, is an advanced machining process in which hardened steels with the hardness greater than 46 HRC are machined without the use of any cutting fluid [1][2][3][4][5][6][7][8][9][10]. Hard turning reduces the additional processing steps, like heat treatment and grinding, which are used during the traditional machining of hard materials [11][12][13][14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

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Experimental Studying of the Variations of Surface Roughness and Dimensional Accuracy in Dry Hard Turning Operation

Yousefi¹,

Zohoor²

2018

TOMEJ

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Objective: Hard turning in dry condition using cubic boron nitride tools, as an alternative of traditional grinding operation, is an advanced machining operation in which hardened steel with the hardness greater than 46 HRc is machined without the use of any coolant. Method: In the hard turning process, due to its hard nature, usually the cutting depth is selected lower than or equal to the nose radius, and the cutting zone is mainly limited within the tool nose area. Thus, unlike the traditional turning, the effect of the nose radius on the surface finish and dimensional accuracy becomes more complicated. Therefore, in this paper, firstly, the effect of processing parameters such as nose radius on the surface roughness and dimensional accuracy is investigated. Then, the relationship between the surface finish and dimensional accuracy variations with vibration, cutting forces, and tool wear is studied experimentally. The results revealed that feed rate is the most important factor influencing the surface roughness, whereas spindle speed and cutting depth are insignificant factors. On the other hand, cutting depth and spindle speed have the greatest effect on the dimensional accuracy, while nose radius has no significant effect. The vibration and wear analysis revealed that compared with the vibration, the tool wear has no considerable effect on the dimensional accuracy. It was also observed that the spindle speed has a contradictory effect on the surface roughness and dimensional accuracy. The best dimensional accuracy is obtained at 500 rpm, while the best surface quality is achieved at 2000 rpm. Result: The obtained results also showed that increasing the feed rate from a particular value not only leads to no significant changes in the surface roughness value but in some cases can also decrease the surface roughness. Conclusion: According to the analysis results, the lowest cutting depth, the moderate feed rate, and the speed lower than 1100 rpm provide the best dimensional accuracy. Compared with carbides and ceramics, cubic boron nitride tools produce a better surface roughness at both higher cutting depth and speed. 0.202 µm is the best surface roughness that was obtained at rε = 1.2 mm, N = 2000 rpm, f = 0.08 mm/rev, d = 0.5 mm which is comparable with the surface quality obtained by the conventional grinding operation.

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Section: Introductionmentioning

confidence: 99%

“…By selecting appropriate processing parameters, the dimensional accuracy improves, and therefore, the additional cutting pass is reduced. As a result, the machining cost and time will be reduced significantly [1,3,4,5,[11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Experimental Studying of the Variations of Surface Roughness and Dimensional Accuracy in Dry Hard Turning Operation

Yousefi¹,

Zohoor²

2018

TOMEJ

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“…Best surface quality was achieved at high cutting speed of 200 m/min and medium feed rate of 145 mm/min for machining of 17-4 PH stainless steel. At lower cutting speed of 75 m/min, deterioration in surface finish was noted when feed was elevated from 100-200 mm/min [14]. From the review of past literature, it is evident that although some research work has been undertaken on machining of few grades of martensitic stainless steel, in depth study on different machinability characteristics of 17-4 PH stainless steel during turning has hardly been reported so far.…”

Section: Introductionmentioning

confidence: 99%

On Applicability of Multilayer Coated Tool in Dry Machining of Aerospace Grade Stainless Steel

Mohanty

Gangopadhyay

Thakur

2015

Materials and Manufacturing Processes

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The present research work has been undertaken with a view to investigate the influence of CVD multilayer coated (TiN/TiCN/Al 2 O 3 /ZrCN) and cutting speed on various machining characteristics such as chip morphology, tool wear, cutting temperature and machined surface roughness during dry turning of 17-4 PH stainless steel. In order to understand the effectiveness of CVD multilayer coated tool a comparison has been carried out with that of uncoated carbide insert. The surface roughness and cutting temperature obtained during machining with CVD multilayer coated tool was higher than that of uncoated carbide insert at all cutting velocity. However, the results clearly indicated that CVD multilayer coated tool played a significant role in restricting various modes of tool failure and reducing chip deformation compared to its uncoated counterpart. Adhesion and abrasion were found to be dominating wear mechanism with flank wear, plastic deformation and catastrophic failure being major tool wear modes.

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“…Duplex steels (ferrito-austenitic) are a better choice in terms of high traction and fatigue resistance, good weldability, good corrosion resistance under load, satisfactory corrosion resistance and lower cost than the austenitic class due to lower Ni content (1.4 -7 %) [8,9]. The aim is to increase the corrosion resistance of these alloys by adding Mo (0.3 -4 %), and increasing the tensile strength by nitrogen addition.…”

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confidence: 99%

Microstructural Characterization of Some Turbine Blade Martensitic Stainless Steels

Berbecaru¹,

Coman²,

Gradinaru³

et al. 2019

Rev. Chim.

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The paper presents microstructural features of three stainless steels utilized in making hydropower turbine parts. Two of these steels were already used in producing these parts, the third one is newly conceived. Aiming better mechanical and corrosion resistance characteristics, steels were produced using an induction furnace with cold crucible under vacuum and argon atmosphere, striving for an inclusion � free state. Quenching and tempering heat treatments were subsequently applied. The microstructural investigations, carried-out by microhardess testing, optical and scanning electron microscopy (SEM) associated with energy dispersive spectrometry (EDS), were able to explain the structural modifications. Refined microstructures were found in the two first steels. Concerning the third one, a precipitation phenomenon of intermetallic compounds such as Ni3(Ti,Mo) was reported, similar to that encountered in the maraging steels class. Mechanical properties of this steel are very different from classic martensitic stainless steels ones. Specifically, after tempering the hardness values do not decrease as in other steels, but increase about 1.6 times. Thus a new steel category with duplex properties is reported.

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Surface quality investigation of turbine blade steels for turning process

Cited by 14 publications

References 28 publications

Experimental Studying of the Variations of Surface Roughness and Dimensional Accuracy in Dry Hard Turning Operation

Experimental Studying of the Variations of Surface Roughness and Dimensional Accuracy in Dry Hard Turning Operation

On Applicability of Multilayer Coated Tool in Dry Machining of Aerospace Grade Stainless Steel

Microstructural Characterization of Some Turbine Blade Martensitic Stainless Steels

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