scholarly journals Correction to: Comparison of the Resistance to Cavitation Erosion and Slurry Erosion of Four Kinds of Surface Modification on 13-4 Ca6NM Hydro-Machinery Steel

2021 ◽  
Author(s):  
C. V. Roa ◽  
J. A. Valdes ◽  
F. Larrahondo ◽  
S. A. Rodríguez ◽  
J. J. Coronado
Keyword(s):  
Surface Modification ◽  
Cavitation Erosion ◽  
Slurry Erosion

scholarly journals Combined wear of slurry erosion, cavitation erosion, and corrosion on the simulated ship surface

2019 ◽  
Vol 11 (3) ◽  
pp. 168781401983445 ◽  
Author(s):  
Liang Liang ◽  
Youxia Pang ◽  
Yong Tang ◽  
Hao Zhang ◽  
Hui Liu ◽  
...  
Keyword(s):  
Cavitation Erosion ◽  
Strong Support ◽  
Wear Test ◽  
Solid Particles ◽  
Surface Material ◽  
Slurry Erosion ◽  
Wear Rates ◽  
Ductile Materials ◽  
Ship Hulls ◽  
The Impact

The surface material of marine ship hulls suffers degradation by slurry erosion because of the impact of sands or solid particles in seawater. When the ship’s moving speed increases, pressure is changed suddenly and cavitation erosion will occur. Therefore, in the ocean, the corrosion of the surface material of the ship hulls is a combined damage in a slurry erosion and cavitation erosion states. An experimental device, for the combined wear, capable of simulating the above working conditions is designed and manufactured. A combined wear test of various materials (Q235, DH32, and NM360 steels) is conducted. The results show that cutting furrows of the slurry erosion, pinholes of the cavitation erosion, holes of electrochemical corrosion, and their combined effect increase the material wear rates and areas. Ductile materials of high strength have less slurry and cavitation damage, and more corrosion damage. For ductile materials of low strength, slurry and cavitation wear play an important role. When the slurry impact speed is increased, the wear degree of materials is also increased. This experimental setup for the combined wear provides a strong support for the development of wear-resistant materials for ship hulls and the structural optimization of ship hulls.

scholarly journals Effect of Thermal Treatment and Erosion Aggressiveness on Resistance of S235JR Steel to Cavitation and Slurry

Materials ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1456
Author(s):  
Alicja K. Krella ◽  
Dominika E. Zakrzewska ◽  
Marta H. Buszko ◽  
Artur Marchewicz
Keyword(s):  
Thermal Treatment ◽  
Mass Loss ◽  
Cavitation Erosion ◽  
Surface Damage ◽  
Strong Increase ◽  
Slurry Erosion ◽  
Erosion Processes ◽  
Significant Damage ◽  
Cavitation Tunnel ◽  
Deep Pits

S235JR steel is used in many applications, but its resistance to the erosion processes has been poorly studied. To investigate this resistance, cavitation, and slurry erosion tests were conducted. These tests were carried out at different erosion intensities, i.e., different flow rates in the cavitation tunnel with a system of barricades and different rotational speeds in the slurry pot. The steel was tested as-received and after thermal treatment at 930 °C, which lowered the hardness of the steel. To better understand the degradation processes, in addition to mass loss measurements, surface roughness and hardness were measured. Along with increasing erosion intensity, the mass loss increased as well. However, the nature of the increase in mass loss, as well as the effect of steel hardness on this mass loss, was different for each of the erosion processes. In the cavitation erosion tests, the mass loss increased linearly with the increase in flow velocity, while in the slurry tests this relationship was polynomial, indicating a strong increase in mass losses with an increase in rotational speed. Cavitation erosion resulted in stronger and deeper strain hardening than slurry. Surface damage from cavitation erosion tests was mainly deep pits, voids, and cracks during the slurry tests, while flaking was the most significant damage.

Experimental apparatus development and mechanism analysis of multiform combined wears in ships under ocean operating conditions

2019 ◽  
Vol 234 (1) ◽  
pp. 33-41
Author(s):  
Liang Liang ◽  
Youxia Pang ◽  
Yong Tang ◽  
Zongming Zhu ◽  
Hao Zhang ◽  
...  
Keyword(s):  
Cavitation Erosion ◽  
Electrochemical Corrosion ◽  
Operating Conditions ◽  
Mechanism Analysis ◽  
Operational Environment ◽  
Slurry Erosion ◽  
Impact Speed ◽  
Ductile Materials ◽  
Experimental Apparatus ◽  
The Impact

Based on the operational environment of ships in the ocean, an experimental apparatus of the combined wear for slurry erosion, cavitation erosion, and electrochemical corrosion is designed and manufactured. The apparatus has two specimen zones, and it can simultaneously conduct several specimen tests for slurry erosion, cavitation erosion with or without the application of electrochemical corrosion. The impact speed, impact angle, environmental pressure, and other parameters are adjustable. The tests of three materials Q235, DH32, and NM360 steels are completed. The results show the wear is mainly slurry erosion and cavitation erosion for ductile materials of low strength and low hardness, and it is mainly corrosion for ductile materials of high strength and high hardness. Corrosion causes more damage to materials than slurry erosion and cavitation erosion. The wear degree of materials increases with the increase of the fluid impact speed.

Slurry Erosion Behavior of Thermal Spray Coatings

2015 ◽  
pp. 268-293
Author(s):  
Harpreet Singh Grewal ◽  
Harpreet Singh
Keyword(s):  
Surface Modification ◽  
Thermal Spray ◽  
Thermal Spray Coatings ◽  
Slurry Erosion ◽  
Erosion Behavior ◽  
Spray Coatings ◽  
Hydro Power Plants ◽  
Surface Modification Techniques ◽  
Sprayed Coatings ◽  
Thermal Sprayed Coatings

Slurry erosion is a degrading phenomenon usually observed in machineries dealing with particle-laden fluid such as hydro power plants, ship propellers, pump impellers, valves, and connecting pipes. The low erosion resistance of commonly employed structural materials prompts the use of different surface modification techniques. Among several types of surface modification techniques, thermal spraying has achieved a significant recognition worldwide due to its versatile nature. In this chapter, slurry erosion behavior of thermal sprayed coatings has been discussed with special emphasis on the contribution of different coating related parameter. It has been observed that microstructure play an important role in determining the slurry erosion performance of thermal spray coatings. Different microstructural features such as splat boundaries, pores, un-melted particles, and cracks are detrimental for the thermal spray coatings exposed to erosive environment. A parameter useful for identification of primary erosion mechanism for thermal sprayed coatings is also discussed.

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