A dissimilar autogenous laser welded joint of AISI 430F (X12CrMoS17) martensitic stainless steel and 304 (X5CrNi18-10) austenitic was manufactured. The examined by non-destructive visual testing destructive macro- microscopic examination hardness measurements. With reference to the ISO 13919-1 standard characterized C level, due gas pores detected. Microscopic observations revealed a mixture ferrite carbides with many type II sulfide inclusions. Detailed analysis showed that they were...

Determination of the cause-and-effect relationship regarding wear lining (beater) a coal beater mill is presented. The type and state material used for aforementioned element was assessed. mechanism brought to material. In analyzed case, excessive Hadfield steel fan identified. This study analyzes chemical composition, macro- microscopic examinations hardness tests find cause their unsatisfactory resistance. test results show significant influence carbon content on process strengthening...

Abstract The aim of the present study was to characterize repair weld serviced (aged) solid-solution Ni-Cr-Fe-Mo alloy: Hastelloy X. welding a gas turbine part carried out using Gas Tungsten Arc Welding (GTAW), same process as for new parts. Light microscopy, scanning electron transmission microhardness measurements were techniques used determine post condition alloy. Compared solution state, an increased amount M 6 C carbide detected, but 23 carbides, sigma and mu phases not. aged...

Results of research on changes in microstructure selected steel grades used construction, observed cooled state after prior exposure to fire temperature are presented this paper. The following have been analyzed detail: S355J2+N, X20Cr13, X6CrNiTi18-10 and X2CrNiMoN22-5-3. These considered be representative for classic low alloy structural ferritic-pearlitic structure, several special stainless varying microstructure: martensitic, austenitic mixed, austenitic-ferritic duplex type. Analysis...

This paper defines the wear process of rollers made 20Cr4. Rollers with a diameter 1000 mm were installed in roller press used for production drop-shaped briquettes and copper concentrate was briquetted 1100 h. Three-dimensional (3D) geometry analysis, metallographic macroscopy, scanning electron microscopy, as well hardness measurements performed. It observed that working surface non-uniformly worn. The smallest affects molding cavities situated on outermost edges ring. increases center...

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Abstract Gas Tungsten Arc butt welded joints of tubes 7CrMoVTiB10-10 made using bainitic-martensitic P 24-IG filler metal were found to be susceptible root cracking. This was avoided by the CMS-IG and austenitic EPRI P87 metal. Detailed coefficient thermal expansion analysis for both metals performed. Unfortunately, is characterized a lower creep rupture strength than 24-IG. For this reason, produced 141 method with two metals: 24- IG P87. All B quality level. Macrostructural,...

W artykule przedstawiono wyniki badan przyczyn pekania spoin ze stali 7CrMoVTiB10-10 stosowanej na ściany szczelne kotlow energetycznych odpornych parametry nadkrytyczne. Ustalono, pekniecia powstają w procesie automatycznego spawania lukiem krytym ścian wytworni oraz montazu budowie, rozruchu i czasie eksploatacji kotla. Przedstawiono mechanizm poszczegolnych etapach procesu produkcyjnego sposoby unikania pekniec krytym. Unikniecie powstalych wyniku siarczkowej korozji naprezeniowej (SSC)...

Abstract The production of a ferrofluid container, intended for use in the KRAKsat (CubeSat type) satellite space conditions, is presented. Mechanized laser beam welding AISI 316L stainless steel test joint and container prototype was developed tested. welded joints were examined by non-destructive visual, penetration radiographic testing destructive macro- microscopic examination, static tensile test, bending hardness measurements. leak temperature-vacuum vibration test. Test joints’...

The production of large-size elements using additive manufacturing is a constantly evolving field that includes technological and material solutions. There need for detailed analysis the process products thus manufactured. In line with this trend, flux-cored wire arc manufactured part made 18Ni-12Co-4Mo-Ti maraging steel were examined. interpass temperature below 150 °C, variation starting point gas flow 12 L/min pre-flow 2 s ensure correct shape layers. underwent chemical composition...

W artykule przedstawiono wyniki oceny twardości i pracy lamania spoin po obrobce cieplnej zlączy spawanych zarowytrzymalej stali niskostopowej T24 (7CrMo-VTiB10-10). Wykazano, ze otrzymanie jednocześnie wymaganych wlaściwości plastycznych jest mozliwe jedynie wyzarzaniu w temperaturze co najmniej 700oC. Podjeto rowniez probe wyjaśnienia przyczyn wystepowania niezadowalającej udarności stosunkowo do niskiej wyzarzania. The properties of joints 7CrMoVTiB10-10 (T24) steel after heat treatment...

Abstract The paper presents the some aspects of optimization filler metals consumption in production welded steel structures. Correct choice beveling method can allow to decrease cost and increase quality. review calculation methods metal at design stage was carried out. Moreover, practical examples amount were presented analyzed. article also contain mobile apps which are makes it easy see welding costs just a few seconds. Apps as well simple excel spreadsheets with correct mathematic...

W artykule przedstawiono próbę implantacyjną oceny skłonności do pęknięć zimnych złączy spawanych. Przedstawiono również wyniki próby dla stali 7CrMoVTiB10-10 oraz badania w zakresie charakteru przełomu. Evaluation of susceptibility to cold cracking welded joints in the implant test AbstractThe paper presents method as useful for evaluation joints. Moreover, there are presented results 7CrMoTiVB10-10 steel and fractures analyses with use light microscopy scanning electron microscopy.

The paper presents research results of the influence heat input into high carbon rail steel during cutting processes on microstructure transformation and cracking. massive block prepared for rolling was cut examined by nondestructive magnetic testing destructive microscopic examination hardness measurements. show unfavorable changes where pearlite transformed ledeburite were obtained. effects presence such microstructures are near to surfaces (above 800 HV) microcracks which grow low cores shaping.

W artykule omowiono pekanie polączen spawanych stali 7CrMoVTiB10-10 (T24), stosowanej na ściany szczelne w kotlach energetycznych, pracujących przy parametrach nadkrytycznych. Jednym z powodow pekania, ze wzgledu mikrostrukture materialu spawanego, moze byc negatywne oddzialywanie wodoru, zarowno podczas spawania, jak i eksploatacji. Stosowanie obrobki cieplnej po spawaniu poprawia wlaściwości plastyczne zlączy, ale wywolywac rowniez relaksacyjne.  Character of fracture welded joints...

The experimental quantification of retention factors related to the post-fire strength as well ductility intentionally selected stainless steel grades applied in construction is objective research presented here. These are characterized by a two-phase austenitic-ferritic microstructure duplex type. In this context, two mutually corresponding chromium-nickel-molybdenum subjected analysis, namely X2CrNiMoN22-5-3 belonging standard group (DSS 22% Cr) and X2CrMnNiN21-5-1 lean (LDSS)....

In the article deals with issue of impact fire on changes in structure and mechanical properties welded joints non-alloy steel elements. The processes occurring during welding, affecting obtained input weld heat affected zone, were analyzed. On this basis, a concise analysis low- high-temperature method extinguishing it non-alloyed steels was made. Recommendations for conducting post-fire expertise structures are included

Due to the wide use of HSLA steels in difficult conditions, e.g. at low temperatures, it is extremely important test impact strength these steels. This equally because most those structures are made by welding steels, and process itself has a significant on properties joints zones. In this work, authors analyzed two selected representative rolled Krakow branch ArcelorMittal Poland S.A. – only place where form hot-rolled strips can be produced an industrial scale. Impact tests were performed...

Experimental quantification of retention factors related to post-fire strength as well ductility intentionally selected stainless steel grades applied in construction is the objective research presented here. These are characterized by a two-phase austenitic-ferritic microstructure duplex type. In this context two mutually corresponding chromium-nickel-molybdenum have been subjected analysis, namely X2CrNiMoN22-5-3 belonging standard group (DSS 22% Cr) and X2CrMnNiN21-5-1 lean (LDSS). The...