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| CAVITATION-CORROSION BEHAVIOR OF CrMnN DUPLEX STAINLESS STEEL |
| Suzhen Luo;Hemin Jing;Yugui Zheng |
| 中科院金属所 |
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Abstract The cavitation erosion (CE) behavior of CrMnN ferri te-austenite duplex stainless steel in distilled water and 3%NaCl solution has b een investigated by using a magnetostrictive-induced cavitation facility.The fre e-corrosion potential and polarization curve under quiescent and cavitating cond ition have been measured by electrochemical technique.The micrographs of damaged surfaces were observed by scanning electron microscope (SEM).It was found that the cavitation resistance of CrMnN steel was higher than that of CrNiMo steel.T he failure mode of ferrite phase was brittle fracture，which had adverse effect on the resistance to CE，while the austenite phase failure was a ductile failure in CrMnN steel.The excellent resistance to CE was related to the good mechanica l properties of austenite phase and the consumption of cavitation energy by plas tic deformation involving slip and twinning.The cavitation shifted the free-corr osion potential in the active direction about 300 mV and increased the current d ensity which maintained the passivity of stainless steel in order of 3，the comp onent of total weight loss directly and indirectly caused by chloride sodium was 5.7%.
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Received: 10 May 2002
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Corresponding Authors:
Suzhen Luo
E-mail: ygzheng@jcpm.syb.ac.cn
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