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INVESTIGATION OF HEAT TREATMENT EFFECTS ON MECHANICAL PROPERTIES AND STRUCTURE OF A WELDED JOINT IN MARTENSITE-AGED STEEL
Odanović Zoran Grabulov Vencislav
The objective of the investigation was to define a technological procedure of forming thin-wall rocket motor chambers out of martensite-aged steels (Fe-Ni-Co-Mo-Ti). The TIG welding procedure was defined as well as heat treatment technologies of welded joints in 2,8 mm thick hot-rolled strips. Testing of the optimum heat treatment of welded joints implied combinations of quenching and aging before and after welding as well as testing their effects on steel structure and mechanical properties. The most optimum welded joint structure and properties were obtained after welded joint quenching and aging – the obtained joint strength presents 80% of the base material strength.
Ključne reči: Material testing, martensite-aged steels, steel welding, heat treatment, application in rocket motors. |