Wear of plowshare components in SAE 950C steel surface hardened by powder boriding

In this study, the surface of steel tooth drill bits (Ni-Cr-Mo based) was subjected to the solidstate boriding treatment with 10-50 nm particle size Nanoboron powder. Boriding processes was carried out at a constant temperature of 1273 K for 30, 45, 60, 75, 90 and 105 minutes using a solid-state box boriding technique. Borided drill bit samples were characterized by conventional methods (microstructure, microhardness, X-ray diffraction and chemical analysis). Wear behaviour of borided samples was tested at different loads and sliding speeds by a microabrasion experimental set up. Metallographic studies showed that the boride layers have a sawtooth morphology and consist of FeB and Fe 2 B. The thickness and hardness of the boride layer was found to be 35.29 -202.56 μm and, 1300-2333 HV 0.1 , respectively, depending on the duration time. The wear resistance of borided samples increased significantly due to the increase in surface hardness and lubricating effect both of which were caused by boriding process.Grooving wear mechanism prevailed in borided samples, while that of bare steel tooth drill bits (STDB) was grooving, rolling and mixed. INTRODUCTIONDrilling is the operation of opening holes in the earth's surface with the help of a drill bit.Drilling systems are divided in two ones as rotary and percussion. Although the rotary system is preferred in deep drilling, both systems have their advantages and disadvantages. In both systems, the drilling performance usually determines the cost of drilling. The drilling performance depends on the drill bit selection as well as the use of the drill bit. Significant cost reductions are ensured through choosing a reliable drill bit (Moore (1); Grimes, et. al. (2); Bobo(3)).The rotational speed of the drill is as effective as the drill selection on the drilling costs and service life of the drill bits. Rotation speed is recommended as 30-40 rev/min in lower surface drillability, 60-120 rev/min with the ability to drill in surface and 70-140 rev/min in the surface of higher ability to drill. In very soft rock rotation speed can be 200-250 rev/min (Moore (1); Cummins (4)).To increase the drilling rate, compression force should be kept constant and the rotational speed must be increased. However, increasing the rotational speed results in an increase in the temperature of the drill bit surface and it accelerates the corrosion and wear (Moore (1); Praillet (5)). Modifications on these materials should be made to ensure the resistance of the drill bit to high temperature conditions.In the improvement of the mechanical characteristics of the steel materials, the most convenient and economical way is surface hardening. Surface hardening methods provide Downloaded by [University of Leeds] at 14:07 05 June 2016 ACCEPTED MANUSCRIPT ACCEPTED MANUSCRIPT 4material surfaces with harder, strong, and abrasion-resistant structures; and a more energyabsorbent inner structure which provides toughness (Ulutan, et. al. (6)). Boriding heat treatment is a commonly used hardening process (ġen, et. ...

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“…2a-b). This is supported by the following 8 data. In this region boron content was found to be 11% (Fig.…”

Section: Methodssupporting

confidence: 78%

Microabrasion Wear Behavior of Fast-Borided Steel Tooth Drill Bits

Günen

Kanca

Demir

et al. 2016

Tribology Transactions

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“…This is especially apparent in the 22 N experiments. From this, we conclude that an increase in process time increases the thickness of the boride layer, which results in a decrease in wear [16,17]. Although similar wear behavior is obtained for samples subjected to other loads, only small increases on weight losses were observed in the samples processed at high temperatures and for extended durations (i.e.…”

Section: Hardness and Microstructure Of Borided Layerssupporting

confidence: 74%

Tribological Properties of Borided AISI 4140 Steel with the Powder Pack-Boriding Method

Ulutan¹,

Yıldırım²,

Çelik³

et al. 2010

Tribol Lett

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The present study evaluates the tribological properties of boride layers on the surface of AISI 4140 steel, formed using the pack-boriding method. Commercial EKabor Ò 2 was used as the boronizing agent and the treatment was carried out at 900, 950, 1000, and 1050°C for 2, 4, and 6 h, respectively. X-ray diffraction (XRD), scanning electron microscopy (SEM), and microhardness tests were used to characterize the phase composition, microstructure, and local hardness, respectively, of the borided steel samples. Block-on-disc tests were used to investigate tribological properties. Abrasive wear tests were carried out using emery paper at a fixed sliding speed and three different loads. Adhesive wear tests were executed against AISI 52100 steel at a fixed load and distance. The coefficient of friction values (COF) of the samples were determined simultaneously during the tests. The weight loss and COF of the borided samples were compared with untreated samples and the results suggest that both wear resistance and friction properties of the AISI 4140 steel improve with boriding.

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“…Recently, martensitic stainless steels are much more considered using in many applications relating high loading and wear. A boride layer on steels is generally accepted against wear [3][4][5], corrosion [6][7][8] and oxidation [8][9][10] occurred during services. In the manufacturing process, boronizing temperature and time are very important *Corresponding author: fax: +662 955 1811; e-mail address: juijerm@gmail.com factors to produce a required boride layer thickness.…”

Section: Introductionmentioning

confidence: 99%

Diffusion kinetics of different boronizing processes on martensitic stainless steel AISI 420

JUIJERM¹

2021

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Martensitic stainless steels are much more considered using in many applications relating high loading and wear. A boride layer on martensitic stainless steel is generally accepted against wear and oxidation occurred during services. Boronizing processes, salt bath and powder pack, were performed on a martensitic stainless steel AISI 420 at a temperature range of 1123-1223 K with boronizing time up to 9 h. Boride layer thicknesses were measured using an optical microscope with an image analyzer program. An X-ray diffraction (XRD) and a scanning electron microscope with energy dispersive X-ray spectroscopy (SEM-EDS) were performed to characterize the boride layers. Kinetics of boronizing processes was analyzed using diffusion and Arrhenius equations. Activation energies and empirical data of the boronizing processes will be determined. It was found that the thicknesses of the boride layers increase with increasing boronizing temperature and time taking into account diffusion theory. Activation energies of 233.5 and 185.2 kJ mol −1 were determined and discussed for martensitic stainless steel AISI 420 boride in a salt bath and powder pack, respectively. Finally, empirical relationships of boride thickness as a function of boronizing temperature and time are presented.

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Wear of plowshare components in SAE 950C steel surface hardened by powder boriding

Cited by 44 publications

References 10 publications

Microabrasion Wear Behavior of Fast-Borided Steel Tooth Drill Bits

Microabrasion Wear Behavior of Fast-Borided Steel Tooth Drill Bits

Tribological Properties of Borided AISI 4140 Steel with the Powder Pack-Boriding Method

Diffusion kinetics of different boronizing processes on martensitic stainless steel AISI 420

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