Case studies of steel and their welded joint failures caused by liquid metal embrittlement LME
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Abstract
Liquid metal embrittlement (LME) is a phenomenon, where liquid (molten) metal is mostly intergranulary (but not only) penetrated into solid metal and causes its brit- tle fracture. The LME is usually related to low melting metals (zink, tin, cadmium) ,which are in the contact with higher molten ones (steels, Ni alloys). Cases of LME as a Cu penetration into pipeline welded joint of 15G2S steel ,a hot temperature corrosion in the cement works shell plate made of AISI 310 stainless steel attacted by Ni3S2 (Ts = 644 °C) and a vanadium corrosion in the boiler vessel (10CrMo9-10 steel) due to V2O5 + Na2SO4 eutecticum (~600 °C) are concerned.
Analiza przypadków pęknięć stalowych złączy spawanych wywołanych obecnością cieczy metaliczne
Streszczenie
Kruchość stali wywołana obecnością cieczy metalicznej (ang. LME liquid metal embrittlement) zachodzi podczas oddziaływania i w konsekwencji penetrowania granic ziaren (stali oraz stopów Ni) niskotopliwych metalami (cu, Zn, Col Sn), w warunkach działania naprężeń rozciągających. W artykule przeanalizowano przypadki LME wynikające z penetrowania Cu złączy spawanych rurociągów ze stali 15G29 oraz wysokotemperaturowej erozji płyt ze stali 310 wg ALSI wywołanej działaniem Ni3S2 (Ts-644 °C) oraz erozji kotła ze stali 10CrMo9-10 wywołanym oddziaływaniem w wysokiej temperaturze V2O5 + Na2SO4.
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