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Research Papers: Applications

Effect of Impact Angle on Slurry Erosion Behavior and Mechanisms of Carburized AISI 5117 Steel

[+] Author and Article Information
Y. M. Abd-Elrhman

Department of Mechanical Engineering,
Faculty of Engineering,
Assiut University,
P.O. Box 71515,
Qesm Than Asyut,
Assiut 71515, Egypt
e-mail: y_mahmoud_a@hotmail.com

A. Abouel-Kasem

Mechanical Engineering Department,
Faculty of Engineering,
King Abdulaziz University,
P.O. Box 344,
Rabigh 21911, Saudi Arabia;
Mechanical Engineering Department,
Faculty of Engineering,
Assiut University,
P.O. Box 71515,
Qesm Than Asyut,
Assiut 71515, Egypt
e-mail: abouelkasem@yahoo.com

K. M. Emara

Mechanical Engineering Department,
Faculty of Engineering,
Assiut University,
P.O. Box 71515,
Qesm Than Asyut,
Assiut 71515, Egypt
e-mail: emara@aun.edu.eg

S. M. Ahmed

Mechanical Engineering Department,
Faculty of Engineering,
Majmaah University,
North Riyadh11952, Saudi Arabia
e-mail: shemy2007@yahoo.com

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received September 14, 2012; final manuscript received July 18, 2013; published online November 26, 2013. Assoc. Editor: Robert L. Jackson.

J. Tribol 136(1), 011106 (Nov 26, 2013) (9 pages) Paper No: TRIB-12-1148; doi: 10.1115/1.4025874 History: Received September 14, 2012; Revised July 18, 2013

The paper reports the influence of carburizing on the slurry erosion behavior of AISI 5117 steel using a whirling-arm rig. The microstructure and hardness profile of the surface layer of carburized steel were investigated. For characterizing the slurry damage process and for better understanding of material removal at different angles, scanning electron microscope (SEM) images at different locations on eroded surface using stepwise erosion combined with relocation SEM were presented. The study is also focused on studying the erosion wear resistance properties of AISI 5117 steel after carburizing at different impact angles. The tests were carried out with particle concentration of 1 wt. %, and the impact velocity of slurry stream was 15 m/s. Silica sand has a nominal size range of 250 – 355 μm was used as an erodent. The results showed that, carburizing process of steel increased the erosion resistance and hardness compared with untreated material for all impact angles. The erosion resistance of AISI 5117 steel increases by 75%, 61%, 33%, 10% at an impact angle of 30 deg, 45 deg, 60 deg, and 90 deg, respectively, as result of carburizing, i.e., the effectiveness of carburizing was the highest at low impact angles. Treated and untreated specimens behaved as ductile material, and the maximum mass loss appeared at impact angle of 45 deg. Plough grooves and cutting lips appeared for acute impact angle, but the material extrusions were for normal impact angles. The erosion traces were wider and deeper for untreated specimens comparing by the shallower and superficial ones for the carburized specimens. Chipping of the former impact sites by subsequent impact particles plays an important role in developing erosion.

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Figures

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Fig. 1

Schematic diagram of the designed slurry erosion whirling-arm rig

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Fig. 2

Schematic diagram of impact velocity and impact angle

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Fig. 3

Scanning electron microphotograph of silica sand (size range, 250–355 μm)

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Fig. 4

SEM micrographs showing microstructures of (a) carburized case depth for 6 h and (b) carburized case depth for 12 h

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Fig. 5

SEM micrograph showing the martensite-austenite microstructure in the case of carburized steel AISI 5117

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Fig. 6

Hardness distribution of treated and untreated material (a) treated for 6 h and (b) treated for 12 h

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Fig. 7

Relationship between the mass loss of untreated material and impact angles for different masses of erodent

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Fig. 8

(a) Relationship between the mass loss of carburized specimens at 950 °C for 6 h and impact angle for different masses of erodent. (b) Relationship between the mass loss of carburized specimens at 950 °C for 12 h and impact angle for different masses of erodent.

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Fig. 9

Mass loss of treated and untreated specimens versus mass of erodent at different impact angles (a) 30 deg, (b) 45 deg, (c) 60 deg, and (d) 90 deg

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Fig. 10

SEM features of eroded surfaces of treated and untreated steel at different impact angles

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Fig. 11

SEM microphotographs of carburized steel AISI 5117 impacted at low impact angles, θ = 30 deg and 45 deg

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Fig. 12

SEM microphotographs of carburized steel AISI 5117 impacted at high impact angles, θ = 60 deg and 90 deg

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