Erosion Phenomenon Caused by Water Droplet Impingement and Life Prediction of Industrial Materials: Part 1-Investigation of Droplet Impingement Factors and Erosion Testing Methods

Miyata, Hirokazu; Isomoto, Yoshinori

doi:10.3323/jcorr.57.138

Cited by 11 publications

(6 citation statements)

References 12 publications

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“…Repeated plastic deformation causes de nite material removal in the rst region of an approximately linear curve, which depends on mechanical properties of a material. The decrease in damage depth rate occurs after the rst region due to the shock absorption of a water lm formed on the bottom of the crater, as mentioned in a previous paper 12) . Then the second linear curve is roughly determined and not necessarily associated with only mechanical properties of the material.…”

Section: Erosion Resistance and That Of Substratessupporting

confidence: 55%

“…The substrate metals consisted of STPT410 and STPA23, which are used as commercial high-temperature boiler tubes, and SUS316 stainless steel, which is a highly corrosion-resistant material. Water droplet impingement tests were conducted using a water-jet apparatus with droplet impingement conditions that have been well de ned 11,12) . The erosion behaviours of materials in the water-jet apparatus were characterized according to the incubation period, I p and thereafter by the average damage-depth rate, R d .…”

Section: Introductionmentioning

confidence: 99%

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Water Droplet Erosion Resistance of Aluminizing Diffusion Coatings on Steel Tubes

2018

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Problems with erosion caused by water droplet impingement occur in high-temperature and high-pressure pipelines and in steam turbines in energy conservation systems and power plants. Advances in material development and the use of highly resistant materials are needed in order to insure a high-performance level of plant maintenance. The use of ceramic coatings or intermetallic diffusion coatings on pipe steels is thought to be bene cial for the improvement of corrosion and erosion resistance. Aluminizing diffusion coatings on a few types of steel tubes with different coating thicknesses were prepared for this experiment. Erosion tests on water droplet impingement were conducted on the internal surface of tubes at a droplet velocity of 148 m s −1 using a water droplet testing apparatus. Erosion resistance was evaluated based on the incubation period and an average damage-depth rate for aluminizing diffusion coatings and steel substrates. Hardness distributions of the coating materials on cross-sectional surfaces revealed a harder layer on the surface, a functional gradient hard layer, and a soft steel substrate. EDX analyses on aluminizing diffusion coatings showed irregularly large grains of alumina, a microstructural intermetallic compound of Al-Fe-C with small grains of alumina, and an Al-Fe-C gradient diffusion layer toward the substrate. Good erosion resistance was obtained with a microstructural intermetallic compound layer with small grains of alumina. However, the erosion resistance of the diffusion layer with large grains of alumina was inferior. The erosion resistance depended on the combinations of the diffusion layer, alumina grains, and steel substrate, but not necessarily on the thickness of the diffusion layers. [

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Section: Erosion Resistance and That Of Substratessupporting

confidence: 55%

Section: Introductionmentioning

confidence: 99%

Water Droplet Erosion Resistance of Aluminizing Diffusion Coatings on Steel Tubes

2018

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“…Miyata and Isomoto [5] experimentally found that eroded mass is proportional to the square of droplet impinging velocity. Therefore, the equation of eroded mass of materials is represented as…”

Section: Erosion Calculationmentioning

confidence: 99%

“…The Incubation period is described by erosion rate and characteristic depth Dc, as shown in Figure 2. Furthermore, it is known that the characteristic depth Dc depends on the mechanical property of material and the droplet impingement velocity [5]. In this study, the characteristic depth Dc [mm] is approximated by the following equation,…”

Section: Erosion Calculationmentioning

confidence: 99%

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Multi Physics Simulation of Liquid Droplet Impingement Erosion

Fujita¹,

Suzuki²,

Yamamoto³

2014

Proceedings of 10th World Congress on Computational Mechanics

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Abstract. Pipe wall thinning is one of the most serious problems in a power plant operation. The analysis of pipe wall thinning phenomenon is a critical issue for the safety and to increase the operation rate of power plants. One of the main causes of pipe wall thinning phenomenon of power generation facilities is the liquid droplet impingement erosion (LDIE). It is well known that the LDIE progress is classified into

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