Wyniki wyszukiwania - Biblioteka Nauki

Nowa wersja platformy, zawierająca wyłącznie zasoby pełnotekstowe, jest już dostępna.
Przejdź na https://bibliotekanauki.pl

Ograniczanie wyników

Znaleziono wyników: 3

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: weldability of steels

Sortuj według:

Ogranicz wyniki do:

Relation Structure - Fracture Resistance in Process of Estimate the Weldability of Low Alloy Steels: Part I

100%

Ratanowski E.

Advances in Materials Science

2010

tom Vol. 10, nr 4(26)

32-40

The relationship between microstructure and mechanical properties of structural materials is still relevant problem in the theory of materials science and mechanical engineering. The question is how the macro-mechanical parameters can be derived from the microscale mechanisms taking into account local structural heterogeneities. Another question is how to make quantitative descriptions of the strength and toughness properties of welded joints made of non-matching weld metal. These problems are the objects of welding and mechanical investigation and they are related to estimation of weldability. The results of this study concern the evaluation stress state at interface of the under- and overmatched weld joints. After formulating a simplified model of under- and overmatched weld joints an analysis was made of stress at interface for the cases of perpendicular and non - perpendicular orientation of the zones (soft - layer and hard - layer) relative to the load action direction under tension.

Weldability of Toughened Steels Used in Ballistic Shields

75%

Luksa K. , Bednarek M.

Biuletyn Instytutu Spawalnictwa w Gliwicach

2016

tom Vol. 60, No. 5

148--155

Scharakteryzowano wybrane stale ulepszane cieplnie stosowane na osłony balistyczne. Przedstawiono wymagania norm co do własności i składu chemicznego tych stali, a także wymagania, jakie muszą spełniać w przypadku wykorzystania ich na osłony balistyczne. Opisano i wymieniono zalecenia związane z procesem spawania tych stali. Porównano równoważniki węgla Ce wybranych gatunków stali stosowanych na osłony balistyczne, a także sugerowane przez producentów stali temperatury podgrzewania wstępnego. Z analizy zebranych informacji wynika, iż do spawania tych stali należy stosować procesy niskowodorowe, które zapewniają zawartość wodoru dyfundującego poniżej 5 cm3 na 100 g stopiwa. Podgrzewanie wstępne jest zalecane dla blach o grubości powyżej 30 mm, a temperatura międzyściegowa nie może przekraczać 200oC. Spawanie należy prowadzić wielościegowo, stosując materiały dodatkowe wysokostopowe, o strukturze austenitycznej, najlepiej z gatunku G 18 8 Mn. W przypadku spawania w osłonach gazowych należy dobierać mieszanki na bazie argonu; zalecane: 82% Ar + 18% CO2 lub 92% Ar + 8% CO2.

The article characterises selected toughened steels used in the production of ballistic shields, presents standard requirements in terms of the proper¬ties and chemical composition of these steels as well as enumerates and discusses guidance on the welding of such steels. The article also presents the results concerning the comparison of the carbon equivalents (Ce) of selected steels used for ballistic shields and preheating temperatures suggested by steel producers. The analysis of collected information revealed that the above named steels should be welded using low-hydrogen processes ensuring the obtainment of a diffusive hydrogen content below 5 cm3 per 100 g of the weld deposit. It was also ascertained that sheets having thicknesses above 30 mm should be subjected to preheating and that interpass temperature should not exceed 200°C. In addition, it was determined that welding should be performed using multiple runs and austenitic high-alloy filler metals, preferably G 18 8 Mn and that gas mixture-shielded welding processes should be performed using argon-based mixtures; preferably 82% Ar + 18% CO2 or 92% Ar + 8% CO2.

Modern martensitic steels for power industry

63%

Łomozik M. , Zeman M. , Brózda J.

Archives of Civil and Mechanical Engineering

2012

tom Vol. 12, no. 1

49--59

The article presents general characteristics of heat-resisting and creep-resisting steels intended for operation at increased temperature and having martensitic microstructure i.e. X10CrWMoVNb9-2 (T/P92), X11CrMoWVNb9-1-1 (E911) and X12CrCoWVNb12-2-2 (VM12- SHC). The weldability of the aforesaid steels is discussed on the basis of CCT diagrams of austenite transformation in welding conditions and the results of simulation tests aimed at determining the resistance of the steels to brittle and annealing cracking. The paper also contains information on test results related to mechanical (strength and plastic) properties of joints welded with various methods. The description of each of the steels under analysis has been supplemented with technological recommendations on welding and heat treatment of joints. The article is addressed to researchers who are interested in problems of heat- and high-temperature creep resisting constructional steels. Furthermore, the article is intended for designers, technologists and welding engineers engaged in constructional jobs in power industry.