State Key Laboratory For Advanced Metals And Materialsuniversity Of Science And Technology Beijingbeijing100083ina

Laboratory for, China

State Key Laboratory For Advanced Metals And Materialsuniversity Of Science And Technology Beijingbeijing100083ina

Laboratory for, China
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Wu H.C.,Life Management Technology Centersuzhou Nuclear Power Research Institutesuzhou 215004ina | Li C.T.,Life Management Technology Centersuzhou Nuclear Power Research Institutesuzhou 215004ina | Fang K.W.,Life Management Technology Centersuzhou Nuclear Power Research Institutesuzhou 215004ina | Xue F.,Life Management Technology Centersuzhou Nuclear Power Research Institutesuzhou 215004ina | Song X.P.,State Key Laboratory For Advanced Metals And Materialsuniversity Of Science And Technology Beijingbeijing100083ina
Materials and Corrosion | Year: 2017

The effects of grain size on the fatigue life and crack initiation mechanism of 316LN stainless steel (SS) in 320°C water environment were investigated by corrosion fatigue cracking test system, scanning electron microscopy (SEM), electron backscatter diffraction technique (EBSD), and transmission electron microscopy (TEM). The grain sizes of the specimens were controlled to be 30, 80, and 210μm, respectively, by different solution treatments. The experimental results indicated that the specimens with fine grains own the longest fatigue lives than those with intermediate and coarse grains. The fatigue stress amplitudes of the specimens increased with the grain refinement, although the fatigue lives of the specimens with intermediate and coarse grains were similar. The improvement of fatigue life for the specimens with fine grains was attributed to the decreasing of the crack initiation induced by refined crystalline strengthening. Moreover, the dislocation structures of the specimens with fine grains consisted of walls and cells. While planar slip bands were found in the specimens with intermediate and coarse grains. © 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Zhang M.X.,State Key Laboratory For Advanced Metals And Materialsuniversity Of Science And Technology Beijingbeijing100083ina | Yang B.,State Key Laboratory For Advanced Metals And Materialsuniversity Of Science And Technology Beijingbeijing100083ina | Wang S.L.,State Key Laboratory For Advanced Metals And Materialsuniversity Of Science And Technology Beijingbeijing100083ina | Wu H.C.,State Key Laboratory For Advanced Metals And Materialsuniversity Of Science And Technology Beijingbeijing100083ina | Shi Y.Z.,State Key Laboratory For Advanced Metals And Materialsuniversity Of Science And Technology Beijingbeijing100083ina
Materials and Corrosion | Year: 2015

By using the Taguchi method with an L16 (45) orthogonal array, the conditions of the double loop electrochemical potentiokinetic reactivation (DL-EPR) technique have been optimized to evaluate the different degrees of the precipitates among the sensitized AISI 316LN austenitic stainless steels. The optimum conditions under the highest resolution of DL-EPR were approved to be 1.2M sulfuric acid, 0.05M potassium thiocyanate, 0.8M sodium chloride, 40mV/min scan rate, and 40°C. Analysis of variance (ANOVA) was used to determine the effect of the control parameters on the degree of sensitization (DOS) difference. As a result of ANOVA, the sulfuric acid concentration had the most significant effect on the DOS difference among the five factors. The percent contributions of sulfuric acid (H2SO4), potassium thiocyanate (KSCN), sodium chloride (NaCl), scan rate, and temperature to the DOS difference were 53.22, 5.33, 21.74, 4.92, and 14.79%, respectively. Finally, the maximum DOS difference (6.7908) obtained from the confirmation experiment showed an approximate 11 times improvement. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

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