Erosion of SS41 steel by sand blasting
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I. INTRODUCTION
STRUCTURAL steels are often used in outdoor or harsh conditions, in which the synergy of wind and sand or dust may result in erosion of the materials. The difference in environmental variables such as temperature and humidity might result in varying degrees of erosion damage. A determination of the effect of environmental variables on erosion damage is, thus, essential in estimating the lifetime of the materials. The previous studies of erosion behavior were concentrated mainly on the effects of impingement angle and velocity, microstructures and mechanical behaviors, particle size and shape, erosion mechanisms, and its modeling. Little research[1,2] has been done on the effect of temperature on erosion damage, while research on the influence of humidity on erosion could hardly be found in the literature. In an article by Smeltzer’s et al.[1] the erosion behaviors of Ti6Al-4V, 17-7 PH, 410 stainless steel, and 2024 Al at room temperature, 204 8C, and 371 8C were studied. They found that erosion losses were reduced with increasing temperatures. This is contrary to our expectation, since the flow strengths and energies required to remove a target material decrease with increasing temperature. Gat and Tabakoff[2] studied the erosion of different materials from 10 8C to 204 8C. Their investigation indicated that erosion damage may increase or decrease as the temperature increases, depending upon the attack angle and upon the test temperature with respect to the thermal properties of the material. The effect of particle size and shape on erosion has been widely studied.[1,3–6] However, the effect of particle size on erosion might depend on environmental conditions, viz., temperature and RH. One of the objectives of the present work is to investigate the particle-size effect in different environmental conditions. The steel JIS SS41 has been widely used for general C.-K. FANG, Associate Professor, is with the Department of Mechanical Engineering, China Institute of Technology and Commerce, Taipei, Taiwan 11522, Republic of China. T.H. CHUANG, Professor, is with the Institute of Materials Science and Engineering, National Taiwan University, Taipei, Taiwan 106, Republic of China. Manuscript submitted April 15, 1998. METALLURGICAL AND MATERIALS TRANSACTIONS A
structures. Damage caused by the blasting of wind and sand is a common problem. The aim of the present research is to study the effect of temperature and humidity on erosion damage of SS41, a rolled structural steel. In addition to the target volume loss, the worn area and worn depth are investigated at different temperatures (25 8C, 35 8C, 45 8C, and 55 8C) and in different RH conditions (50, 65, 80, and 95 pct). Finally, the effects of particle size and the morphologies of the eroded surfaces are investigated as well. II. EXPERIMENTAL A sand blast–type test rig with a gas jet based on ASTM G76 was employed in the erosion tests. The setup consists of a particle-gas supply system, an exit nozzle, and a chamber. The chamber is 1000 3 800 3 500 mm in siz
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