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| Effect of Aging Temperature on Microstructure and Corrosion Behavior of 15-5PH Precipitation Hardened Stainless Steel |
| HUA Xiaozhen, HUANG Jinhua, NIE Lun, ZHOU Xianliang, PENG Xinyuan |
| School of Material Science and Engineering, Nanchang HangKong University, Nanchang 330063,China |
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Abstract The effect of aging treatment temperature on the evolution of the microstructure and corrosion resistance of 15-5PH stainless steel was studied by means of XRD, SEM and TEM as well as immersion test and measurements of polarization curve and electrochemical impedance spectroscopy. The results show that the martensitic structure of the steel is gradually decomposed to be finer with the increase of aging temperature, while NbC particles precipitate in between martensitic laths. Spherical particles of Cu-rich phase is separated out at aging temperature 550 ℃. Austenite was observed at 580 ℃ implying the reverse conversion from martensite to austenite occurs due to over ageing. With the increase of aging temperature, the Cu-rich phase change into coherent from incoherent, which gathered to growth as short rod at 620 ℃; the corrosion weight loss rates increase; the corrosion potential decrease; Ac impedance values reduced and therefore the corrosion resistance of the steel degraded.
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Received: 08 May 2013
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