Flash butt weldability of austenitic high strength steels

• Autorzy: Schmidova E. , Svanda P. , Konecny M.
• Języki publikacji: EN

Abstrakty

EN

This paper deals with specific changes in the structure of crossings made of Hadfield's steel, caused by heat and mechanical stress during the welding process, and of rails made of carbon steel. Experiments were undertaken to analyze the sources of damage to the weld joint, established by a post-weld capillary test after machining the weld joints. The analysis demonstrated the presence of welding defects consisting of a phosphide phase and of carbides as a secondary phase. The distribution and amount of this undesirable phase was given by the technical welding parameters employed. It was established that the material is prone to hot tearing only in a very narrow zone inside the heat-affected zone where comprehensive reaustenitization takes place. Initiation of the defects is related to the presence of a phosphide eutectic. A further growth of cracks takes place along the carbide border line; this means that the main factor limiting the use of such welds is attainment of structural degradation. Reducing the thermal effect on the welded components is thus essential for further use of the investigated samples

Słowa kluczowe

EN

welding; Hadfield steel; structural defects; phosphide eutectic; cracking growth

PL

spawanie; wady konstrukcyjne; eutektyka fosforowa; pęknięcia

• Wydawca: Oficyna Wydawnicza Uniwersytetu Zielonogórskiego
• Czasopismo: International Journal of Applied Mechanics and Engineering
• Rocznik: 2010
• Tom: Vol. 15, no 2
• Strony: 477--482
• Opis fizyczny: Bibliogr. 5 poz., rys., tab., wykr.

Twórcy

autor

Schmidova E.

autor

Svanda P.

autor

Konecny M.

• University Pardubice, DFJP -KMMCS Studentska 95, 532 10 Pardubice, CZECH REPUBLIC,

Bibliografia

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• Fucheng Zhang Bo Lv, Baitao Hu Yanguo Li (2007): Flash butt welding of high manganese steel crossing and carbon steel rail. – Material Science and Engineering A, No.454-455, pp.288-292.
• Hlavatý I., Foldyna V., and K(Bel Z. (2001): Technology of building-up rails without preheating. In: Proceedings of the 7th International Conference Technológia 2001. – Bratislava: Slovak University of Technology, Faculty of Mechanical Engineering, pp.599-602.
• Mohyla P. (2004): Affect of tempering temperatures on mechanical properties of weld joints in low-alloyed creep-resistant steels. – Acta Metallurgica Slovaca, vol.10, No.4, pp.193-200.
• Shulik D., Kamarash L., Vilchko Ya. and Dzugas P. (1992): Phosphide eutectic in a Hadfield steel structure. – Metal Science and Heat Treatment, No.2, pp.2-3.