Evolution of TiS and TiN in Fe-40 MassPctNi Austenitic Alloy During Heating at 1273 K (1000 °C)

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Abstract

Evolution of TiS in composition and morphology as well as the change in size distribution of TiS and TiN in Fe-40 masspctNi austenitic alloy during heating at 1273 K (1000 °C) was investigated using manual/automatic scanning electron microscopy energy-dispersive X-ray spectroscopy (SEM/EDS). Two types of TiS morphologies, spindle and spherical, were maintained during heating. The molar ratio of Ti/S of TiS increased while the aspect ratio of TiS was maintained in both alloys during heating. The number density of TiN inclusions was low compared with TiS in each alloy during heating. The pinning effect of TiS during heating was confirmed, and was stronger in alloy with a larger volume fraction of TiS. The results contribute to the establishment of optimum heat treatment processes for austenitic stainless steel to obtain better pitting corrosion resistance.

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Acknowledgments

The authors are grateful to Professor Xiaojun Hu and Technician Dr. Huijing Cheng in State Key Laboratory of Advanced Metallurgy in University of Science and Technology of Beijing for their assistance on the analysis of automatic SEM-EDS.

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Correspondence to Fumitaka Tsukihashi.

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Manuscript submitted June 7, 2019.

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Li, M., Matsuura, H. & Tsukihashi, F. Evolution of TiS and TiN in Fe-40 MassPctNi Austenitic Alloy During Heating at 1273 K (1000 °C). Metall Mater Trans B 50, 2993–3001 (2019). https://doi.org/10.1007/s11663-019-01707-9

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