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Changes in precipitation and corrosion characteristics of 18/10Ti austenitic stainless steel exposed to prolonged annealing at 750–850 °C
Author(s) -
Vodárek Vlastimil,
Číhal Vladimír,
Hubáčková Jiřina,
Mazanec Karel
Publication year - 1988
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.198801548
Subject(s) - intergranular corrosion , metallurgy , materials science , acicular , austenite , isothermal process , precipitation , annealing (glass) , acicular ferrite , corrosion , microstructure , bainite , physics , meteorology , thermodynamics
This investigation deals with the analysis of intergranular acicular precipitations by X‐ray diffraction techniques and SEM. Results obtained during analysing acicular precipitate in 18/10Ti steel, isothermally annealed at 750–850 °C, can be summarised as follows: Intergranular needles are constituted by a complex phosphide of M 2 P type whose chemical composition can be written as (Ti,Cr,Fe,Ni) 2 P. Crystal growth direction of intergranular acicular M 2 P particles in austenite is 〈 100 〉 γ . The following orientation relationship was determined between the complex phosphide of M 2 P type and austenite: . Corrosion testing in boiling 65% HNO 3 revealed that there was a relationship between the occurrence of acicular precipitate and a reduction in corrosion rate to a level below 0.5 g m −2 h −1 .