Influence of non-metallic inclusions on the corrosion resistance of duplex stainless steels
Jazyk: | ruština |
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Rok vydání: | 2022 |
Předmět: |
electrochemical studies
types of deoxidizers ÑлекÑÑÐ¾Ñ Ð¸Ð¼Ð¸ÑеÑкие иÑÑÐ»ÐµÐ´Ð¾Ð²Ð°Ð½Ð¸Ñ pitting corrosion non-metallic inclusions меÑаллогÑаÑиÑеÑкие иÑÑÐ»ÐµÐ´Ð¾Ð²Ð°Ð½Ð¸Ñ duplex stainless steels metallographic studies немеÑаллиÑеÑкие вклÑÑÐµÐ½Ð¸Ñ ÑÐ¸Ð¿Ñ ÑаÑкиÑлиÑелей дÑплекÑнÑе неÑжавеÑÑие ÑÑали пиÑÑÐ¸Ð½Ð³Ð¾Ð²Ð°Ñ ÐºÐ¾ÑÑÐ¾Ð·Ð¸Ñ |
DOI: | 10.18720/spbpu/3/2022/vr/vr22-2517 |
Popis: | Тема вÑпÑÑкной квалиÑикаÑионной ÑабоÑÑ: «ÐлиÑние немеÑаллиÑеÑÐºÐ¸Ñ Ð²ÐºÐ»ÑÑений на коÑÑозионнÑÑ ÑÑойкоÑÑÑ Ð´ÑплекÑнÑÑ Ð½ÐµÑжавеÑÑÐ¸Ñ ÑÑалей». РабоÑа поÑвÑÑена изÑÑÐµÐ½Ð¸Ñ Ð²Ð»Ð¸ÑÐ½Ð¸Ñ Ð½ÐµÐ¼ÐµÑаллиÑеÑÐºÐ¸Ñ Ð²ÐºÐ»ÑÑений (ÐÐ) ÑазлиÑного Ñипа на коÑÑозионнÑÑ ÑÑойкоÑÑÑ Ð´ÑплекÑнÑÑ Ð½ÐµÑжавеÑÑÐ¸Ñ ÑÑалей. ÐÑоведена вÑплавка и Ñазливка коммеÑÑеÑкой маÑки дÑплекÑной неÑжавеÑÑей ÑÑали Ñ ÑазлиÑнÑми ваÑианÑами ÑаÑкиÑÐ»ÐµÐ½Ð¸Ñ â алÑминиевой пÑоволокой и ÑедкоземелÑнÑми меÑаллами. ÐÑполÑзÑÑ Ð¼ÐµÑÐ¾Ð´Ñ Ð¾Ð¿ÑиÑеÑкой и ÑлекÑÑонной микÑоÑкопии в ÑовокÑпноÑÑи Ñ ÑлекÑÑÐ¾Ñ Ð¸Ð¼Ð¸ÑеÑкими иÑÑледованиÑми, изÑÑено влиÑние ÐРна коÑÑозионнÑÑ ÑÑойкоÑÑÑ Ð´ÑплекÑнÑÑ Ð½ÐµÑжавеÑÑÐ¸Ñ ÑÑалей. ÐпÑÐµÐ´ÐµÐ»ÐµÐ½Ñ Ð½Ð°Ð¸Ð±Ð¾Ð»ÐµÐµ опаÑнÑе Ñ ÑоÑки зÑÐµÐ½Ð¸Ñ Ð¿Ð¸ÑÑингообÑÐ°Ð·Ð¾Ð²Ð°Ð½Ð¸Ñ ÑÐ¸Ð¿Ñ Ð½ÐµÐ¼ÐµÑаллиÑеÑÐºÐ¸Ñ Ð²ÐºÐ»ÑÑений в дÑплекÑнÑÑ Ð½ÐµÑжавеÑÑÐ¸Ñ ÑÑалÑÑ Ð¸ ÑазÑабоÑÐ°Ð½Ñ ÑекомендаÑии Ð´Ð»Ñ Ð¸Ñ Ð¼Ð¸Ð½Ð¸Ð¼Ð¸Ð·Ð°Ñии. ÐзÑÑена ÑÑанÑÑоÑмаÑÐ¸Ñ Ð½ÐµÐ¼ÐµÑаллиÑеÑÐºÐ¸Ñ Ð²ÐºÐ»ÑÑений поÑле ÑаÑкиÑÐ»ÐµÐ½Ð¸Ñ ÑазлиÑнÑми ÑлеменÑами. Ðоказано, ÑÑо, иÑполÑзÑÑ ÑазлиÑнÑе ÑÐµÑ Ð½Ð¾Ð»Ð¾Ð³Ð¸Ð¸ ÑаÑкиÑлениÑ, можно полÑÑаÑÑ ÐºÐ°Ðº опаÑнÑе Ñ ÑоÑки зÑÐµÐ½Ð¸Ñ ÐºÐ¾ÑÑозионной акÑивноÑÑи ÐÐ, Ñак и оÑноÑиÑелÑно безопаÑнÑе, не ÑвлÑÑÑиеÑÑ Ð¸Ð½Ð¸ÑиаÑоÑами заÑÐ¾Ð¶Ð´ÐµÐ½Ð¸Ñ Ð¿Ð¸ÑÑингов. ÐÑоведена ÑеÑмодинамиÑеÑÐºÐ°Ñ Ð¾Ñенка коÑÑозионной акÑивноÑÑи немеÑаллиÑеÑÐºÐ¸Ñ Ð²ÐºÐ»ÑÑений, коÑоÑÐ°Ñ Ð¿Ð¾Ð·Ð²Ð¾Ð»ÑÐµÑ ÑанжиÑоваÑÑ Ð²ÐºÐ»ÑÑÐµÐ½Ð¸Ñ Ð¿Ð¾ ÑÑепени опаÑноÑÑи заÑÐ¾Ð¶Ð´ÐµÐ½Ð¸Ñ Ð½Ð° Ð½Ð¸Ñ Ð¿Ð¸ÑÑингов. РезÑлÑÑаÑÑ ÑÑой оÑенки можно иÑполÑзоваÑÑ Ð¿Ñи ÑазÑабоÑке ÑÐµÑ Ð½Ð¾Ð»Ð¾Ð³Ð¸Ð¸ ÑаÑкиÑÐ»ÐµÐ½Ð¸Ñ ÐÐС на пÑоизводÑÑве. Topic of the bachelor's thesis: "Influence of non-metallic inclusions on the corrosion resistance of duplex stainless steels".In this study, the effect of different types of non-metallic inclusions (NMIs) on the corrosion resistance of duplex stainless steel was examined. Melting and casting of a commercial grade of duplex stainless steel with various deoxidation options â aluminum wire and rare-earth metals was carried out. Using the methods of optical and electron microscopy in combination with electrochemical studies, the influence of NMIs on the corrosion resistance of duplex stainless steels has been studied. The most dangerous types of NMIs initiated pitting corrosion in duplex stainless steels have been determined and recommendations to minimize them have been developed. The transformation of NMIs after deoxidation by various elements has been studied. It is shown that, using various deoxidation technologies, it is possible to obtain both NMIs that are dangerous and relatively safe in terms of corrosive activity. A thermodynamic assessment of the corrosion activity of NMIs has been carried out, which makes it possible to rank the inclusions according to the degree of danger of pitting on them. The results of this assessment can be used in the development of technology for the deoxidation of DSSs in production. |
Databáze: | OpenAIRE |
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