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

Abstract

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.

Influence of Material Hardness and Particle Velocity on Erosive Wear Rate

“…Researchers have investigated the effect of different parameters on erosion wear. Fuyan et al 14 , Abd-Elrhman et al 15 , Patil et al 16 analyzed the effect of impact angle, Desale et al 17 , Lynn et al 18 , Liebhard et al 19 studied the effect of particle size , Dasgupta et al 20 , Grewal et al 21 analyzed the effect of sand concentration, Levy et al 22 analyzed the effect of particle shape, Biswas et al 23 , Franek et al 24 investigated the effect of particle impact energy, Sundararajan et al 25 analyzed the effect of slurry temperature and Gandhi et al 26 Okonkwo et al 27 Aquaro et al 28 studied the effect of impact velocity on wear rate and wear methodology. Limited studies were carried out to investigate the effect of material hardness on erosion wear rate and mechanism [29][30][31][32][33] .…”

Yüksek fırın granüle cürufunun sert kaplama uygulanmış ve uygulanmamış çeliklere karşı erozif aşındırma davranışının incelenmesi

“…Ayrıca dikkat çekici bir şekilde yüzeyde yüksek hız ve konsantrasyon nedeniyle tüm yüzeye dağılmış şekilde aşırı derecede plastik deformasyon izleri mevcuttur. Bunların yanında yüzeyde normal çarpma açılarında sıklıkla rastlanan malzeme ekstrüzyonları [24] ve hemen hemen tüm yüzeye dağılmış bir şekilde gömülü partiküller mevcuttur. Yüksek fırın cüruflarını taşıyan sistemlerin tasarımlarında bu çalışmanın sonuçlarının değerlendirilmesinde dikkat edilmesi gereken hususlar partikül boyut dağılımı olmalıdır.…”

SLURRY EROSION-CORROSION RESISTANCE OF ELECTROLESS Ni-P PLATING ON AISI 5117 STEEL

“…Full description of this rig and how it works as well as its dynamics are found in Refs. [25][26][27][28]. In this test rig two specimens were clamped in specimen fixtures mounted on two horizontal arms rotated by a variable speed electric motor.…”