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1

Consecutive Casting of Iron Bimetal with Low-Carbon Steel Interface Plate

Purwadi W., Bandanadjaja B., Idamayanti D., Lilansa N.

Archives of Foundry Engineering

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2020

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Vol. 20, iss. 1

95--104

EN

Consecutive casting of bimetallic applies consecutive sequences of pouring of two materials into a sand mold. The outer ring is made of NiHard1, whereas the inner ring is made of nodular cast iron. To enable a consecutive sequence of pouring, an interface plate made of low carbon steel was inserted into the mold and separated the two cavities. After pouring the inner material at the predetermined temperature and the interface had reached the desired temperature, the NiHard1 liquid was then poured immediately into the mold. This study determines the pouring temperature of nodular cast iron and the temperature of the interface plate at which the pouring of white cast iron into the mold should be done. Flushing the interface plate for 2 seconds by flowing nodular cast iron liquid as inner material generated a diffusion bonding between the inner ring and interface plate at pouring temperatures of 1350°C, 1380°C, and 1410°C. The interface was heated up to a maximum temperature of 1242°C, 1260°C, and 1280°C respectively. The subsequent pouring of white cast iron into the mold to form the outer ring at the interface temperature of 1000°C did not produce a sufficient diffusion bonding. Pouring the outer ring at the temperature of 1430°C and at the interface plate temperature of 1125°C produced a sufficient diffusion bonding. The presence of Fe3O2 oxide on the outer surface of the interface material immediately after the interface was heated above 900⁰C has been identified. Good metallurgical bonding was achieved by pouring the inner ring at the temperature of 1380°C, interface temperature of 1125°C and then followed by pouring of the outer ring at 1430⁰C and flushing time of 7 seconds.

2

Badania porównawcze parametrów obróbki cieplnej elementów ze stopu CuNi2Si kutych z prętów wyciskanych i odlewanych metodą ciągłą

Knych T., Kwaśniewski P., Mamala A., Kawecki A., Kiesiewicz G., Nowak A.

Rudy i Metale Nieżelazne

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2010

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R. 55, nr 1

25-33

PL

Tradycyjnie materiałem wsadowym do kucia matrycowego drobnych elementów są pręty wyciskane. Chociaż taki materiał posiada wiele zalet wyrażających się przede wszystkim korzystną dla wyrobu gotowego drobnoziarnistą strukturą oraz dobrą tolerancją wymiarów, to wysoka cena wyrobów wyciskanych skłania do poszukiwania nowych rozwiązań w tym względzie. W artykule przedstawiono fragment wyników badań porównawczych nad technologią kucia nośno-przewodzących elementów górnej sieci trakcyjnej ze stopu miedzi gat. CuNi2Si z prętów wyciskanych oraz odlewanych metodą ciągłą. Kucie elementów z odlewanych prętów okrągłych o średnicy bezpośrednio dopasowanej do projektu procesu pozwala na eliminację pośredniej operacji tradycyjnego odlewania i wyciskania wlewków, co istotnie poprawia rentowność tej technologii. Celem przedstawionych w pracy wyników badań jest ukazanie wpływu warunków końcowej obróbki cieplnej, tj. starzenia sztucznego, na strukturę i własności wyrobów oraz wykazanie, że jakość wyrobów kutych z prętów odlewanych nie ustępuje wyrobom uzyskiwanym z prętów wyciskanych.

EN

Traditionally for the die forging process of small elements we use extruded rods. This kind of material has lots of advantages and especially fine-grained structure and good dimensional tolerance which are very profitable for the finished product. Unfortunately apart from the good quality of extrusion process it is also very expensive. This juncture forces the necessity to search for new material solutions. In this article the part of comparative researches of CuNi2Si railway traction elements die forging process were presented. First part of railway traction elements were forged from extruded rods, and the second part were forged from rods obtained from continuous casting process. Die forging of circle elements obtained from continuous casting process which are directly matched to the process shape requirements allows to eliminate traditional casting intermediate extruding operation which at the end significantly improves the economical value of this technology. Main purpose of introduced researches is to show the influence of artificial ageing conditions on the structure and properties of manufactured elements. Moreover the quality of rods manufactured from continuous casting process is practically the same as those after the extrusion process.

3

Development of the microalloyed constructional steels

Adamczyk J.

Journal of Achievements in Materials and Manufacturing Engineering

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2006

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Vol. 14, nr 1-2

9--20

EN

Purpose: The aim of the paper is to present the development and the technical importance of the HSLA-type microalloyed constructional steels (High Strength Low Alloy) in selected industry branches. Design/methodology/approach: A mechanism of the interaction of Nb, Ti, V and B microadditions introduced into the steel on mechanical properties of selected metallurgical products with the fine-grained structure, forming under the properly selected hot-working conditions with the of (M-Nb, Ti, V; X-N,C) interstitial phases MX-type is discussed. Findings: The requirements concerning the metallurgical process, continuous casting of steel and the necessity of adjusting the hot-working conditions to the precipitation kinetics of the dispersive MX phases particles in austenite, in the controlled rolling or thermo-mechanical treatment processes are indicated. Research limitations/implications: The continuation of investigations concerning the thermo-mechanical rolling of automotive sheets with the multiphase structure of microalloyed steels is planned. Practical implications: The indicated data, coming also from the own research, are of practical use in relation to manufacturing the metallurgical products and machine elements of high strength and crack resistance, also at low temperatures. Originality/value: The results contribute to the development of rolling and forging technologies of the microalloyed steel (HSLA) elements produced using the energy-saving thermo-mechanical treatment methods.