Surface texture formation in precision machining of direct laser deposited tungsten carbide

Wojciechowski, Szymon; Nowakowski, Zbigniew; Majchrowski, Radomir; Królczyk, Grzegorz

doi:10.1007/s40436-017-0188-3

Cited by 16 publications

(7 citation statements)

References 27 publications

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“…In recent years, we have seen intensive development of techniques associated with precise processing of the products obtained by means of additive manufacturing. The results presented in literature [14,15,21] enable an effective choice of processing parameters for such products. Moreover, the manufacturers of materials obtained as a result of DMLS technologies suggest various types of finishing processes e.g.…”

Section: Introductionmentioning

confidence: 99%

Effect of the shot peening on surface properties of Ti-6Al-4V alloy produced by means of DMLS technology

Żebrowski¹,

Walczak²,

Klepka³

et al. 2019

Eksploatacja i Niezawodność – Maintenance and Reliability

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Article citation info: (*) Tekst artykułu w polskiej wersji językowej dostępny w elektronicznym wydaniu kwartalnika na stronie www.ein.org.pl Żebrowski r, wAlczAk M, klepkA T, pAsierbiewicz k. effect of the shot peening on surface properties of Ti-6Al-4V alloy produced by means of DMls technology. eksploatacja i Niezawodnosc -Maintenance and reliability 2019; 21 ( 1): 46-53, http://dx.doi.org/10.17531/ ein.2019.1.6. remigiusz Żebrowski Mariusz wAlczAk Tomasz klepkA kamil pAsierbiewicz EffEct of thE shot pEEning on surfacE propErtiEs of ti-6al-4V alloy producEd by mEans of dmls tEchnology WpłyW nagniatania strumiEnioWEgo na WłaściWości EksploatacyjnE stopu ti-6al-4V uzyskanEgo tEchnologią przyrostoWą dmls* The state of the surface layer and biocompatibility are the key parameters contributing to successful implantation of prostheses such as bone implants which are now increasingly often produced by means of DMLS technologies. The analysis of these factors and proper selection of material are required in order to determine the most favourable technological parameters contributing to long term functioning in course of their presence in human body. Therefore, the purpose of the present paper is to investigate the effect of shot peening on the state of the surface layer and corrosion resistance of specimens made of Ti-6Al-4V titanium alloy produced in Direct Metal Laser Sintering (DMLS) process. The specimens have been produced by means of EOSINT M280 system dedicated for laser sintering of metal powders and their surfaces have been subjected to the shot peening process under three different working pressures (0.2, 0.3 and 0.4 MPa) and by means of three different media i.e. CrNi steel shot, crushed nut shells and ceramic balls based on ZrO 2 . It has been found that the process conditions i.e. working pressure in course of shot peening and proper selection of applied shot will make it possible to achieve the properties in modified material sufficient to ensure that assumed functions associated with the improvement of surface layer condition are invariable during required period in specified implant operation conditions. In such case, these factors have been determined in course of microhardness tests, evaluation of surface development degree as well as potentiodynamic tests. The increase of working pressure caused deteriorated corrosion resistance. Simultaneously, it has been found the corrosion resistance was most satisfactory for the surfaces modified by means of: ceramic balls based on ZrO 2 > crushed nut shells > CrNi steel shot correspondingly.

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Section: Introductionmentioning

confidence: 99%

Effect of the shot peening on surface properties of Ti-6Al-4V alloy produced by means of DMLS technology

Żebrowski¹,

Walczak²,

Klepka³

et al. 2019

Eksploatacja i Niezawodność – Maintenance and Reliability

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show abstract

“…In order to determine h min on the basis of the surface roughness height, taking into account the influence of the kinematic–geometric model, one can use the Brammertz approach, which has been employed by the authors of [ 81 ]. This model makes it possible to determine the theoretical surface roughness Rzt for the projection of the cutting edge arc, taking into account the feed per tooth f z , corner radius r ε , and h min according to the equation [ 82 ]

where:…”

Section: Experimental Methods For Minimum Uncut Chip Thickness Determinationmentioning

confidence: 99%

Estimation of Minimum Uncut Chip Thickness during Precision and Micro-Machining Processes of Various Materials—A Critical Review

Wojciechowski

2021

Materials

Self Cite

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Evaluation of the phenomena characterizing the chip decohesion process during cutting is still a current problem in relation to precision, ultra-precision, and micro-machining processes of construction materials. The reliable estimation of minimum uncut chip thickness is an especially challenging task since it directly affects the machining process dynamics and formation of a surface topography. Therefore, in this work a critical review of the recent studies concerning the determination of minimum uncut chip thickness during precision, ultra-precision, and micro-cutting is presented. The first part of paper covers a characterization of the precision, ultra-precision, and micro-cutting processes. In the second part, the analytical, experimental, and numerical methods for minimum uncut chip thickness estimation are presented in detail. Finally, a summary of the research results for minimum uncut chip thickness estimation is presented, together with conclusions and a determination of further research directions.

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“…Li et al [ 14 ] established a relationship between surface roughness (SR) and SSD depth for optical materials based on the model established by Lambropoulos et al Shen et al [ 15 ] presented the relationship between the median crack depth and cutting depth for optical glass during the scratching process. Unlike isotropic materials like glass, single crystal silicon has anisotropy in the surface and exists through the process of brittle-ductile transition [ 16 , 17 ]. Zhang [ 18 ] developed an analytical model in the rotation grinding process to predict the SSD depth in the silicon wafer, which considered the effect of anisotropy in the grinding process.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Crystal Orientation on Subsurface Damage of Mono-Crystalline Silicon by Bound-Abrasive Grinding

Yang

Li²

2021

Micromachines

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Subsurface damage (SSD) produced in a grinding process will affect the performance and operational duration of single-crystal silicon. In order to reduce the subsurface damage depth generated during the grinding process by adjusting the process parameters (added), experiments were designed to investigate the influence of machining factors on SSD. This included crystal orientation, diamond grit size in the grinding wheel, peripheral speed of the grinding wheel, and feeding with the intention to optimize the parameters affecting SSD. Compared with isotropic materials such as glass, we considered the impact of grinding along different crystal directions <100> and <110> on subsurface damage depth (added). The Magnetorheological Finishing (MRF) spot technique was used to detect the depth of SSD. The results showed that the depth of SSD in silicon increased with the size of diamond grit. SSD can be reduced by either increasing the peripheral speed of the grinding wheel or decreasing the feeding rate of the grinding wheel in the <100> crystal orientation, if the same size of diamond grit was employed. In addition, we proposed a modified model around surface roughness and subsurface crack depth, which considered plastic and brittle deformation mechanisms and material properties of different crystal orientations. When the surface roughness (RZ) exceeded the brittle-plastic transition’s critical value RZC (RZC<100> > 1.5 μm, RZC<110> > 0.8 μm), cracks appeared on the subsurface. The experimental results were consistent with the predicted model, which could be used to predict the subsurface cracks by measuring the surface roughness. However, the model only gives the approximate range of subsurface defects, such as dislocations. The morphology and precise depth of plastic deformation subsurface defects, such as dislocations generated in the fine grinding stage, needed to be inspected by transmission electron microscopy (TEM), which were further studied.

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Surface texture formation in precision machining of direct laser deposited tungsten carbide

Cited by 16 publications

References 27 publications

Effect of the shot peening on surface properties of Ti-6Al-4V alloy produced by means of DMLS technology

Effect of the shot peening on surface properties of Ti-6Al-4V alloy produced by means of DMLS technology

Estimation of Minimum Uncut Chip Thickness during Precision and Micro-Machining Processes of Various Materials—A Critical Review

The Influence of Crystal Orientation on Subsurface Damage of Mono-Crystalline Silicon by Bound-Abrasive Grinding

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