Authors : Do Van Quang, Bui Thi Thanh Huyen and Tran Duc Huy
Abstract: The effect of solution annealing temperature ranging from 1050-1100°C and aging at 480°C on the microstructure, mechanical properties and pitting corrosion resistance of Super Duplex Stainless Steel (SDSS) casting were investigated. Obtained results showed that the content of ferrite phase slightly increased as decreasing of austenite phase. The ε-Cu was observed into incoherent type after solution annealing and coherent type after solution annealing and aging at 480°C. The small particles of the g-phase dispersed in ferrite matrix increase their hardness and diminish corrosion resistance of ferrite phase. Especially, the little negative hysteresis and high breakdown potentials determined from cyclic potentiodynamic polarization curves of SDSS showed that the high pitting corrosion resistance were obtained for the sample with both annealing and aging. The mechanical properties of the SDSS casting were also investigated such as hardness, micro hardness and impact strength. The value of hardness and impact strength of SDSS casting which were solution annealing at 1100°C and aging at 480°C were 295 HB and 77 J, respectively.
Do Van Quang, Bui Thi Thanh Huyen and Tran Duc Huy, 2018. The Effect of Heat Treatment Conditions on the Microstructural Characterization, Mechanical Properties and Corrosion Behavior of Super Duplex Stainless Steel Casting. Journal of Engineering and Applied Sciences, 13: 1239-1245.