An NbC-Fe composite powder was synthesized from an Nb₂O₅/Fe/C mixture by electrochemical reduction and subsequent carbonization in molten CaCl₂-NaCl. The composite has a core-shell structure, in which NbC acts as the cores distributing in the Fe matrix. A strong bonding between NbC and Fe is benefit from the core-shell structure. The sintering and electrochemical reduction processes were invest...

Microstructures and Charpy impact properties have been examined in two microalloyed steels following heat treatments to simulate weld heat affected zone (HAZ) structures over a range of heat input conditions, characterised by the cooling time from 800 to 500 !C (Dt8/5). The base materials were low carbon structural steel plates microalloyed with vanadium and nitrogen (V–N) and niobium (Nb), res...

Very important property of powder metallurgy parts is ability to join components produced by different manufacturing technologies or dissimilar materials. Properties Nb modified HK30 are highly influenced conditions applied during sintering. Weldability sintered can be improved using favorable sintering conditions. In this regard, effect parameters on fusion weldability presented in paper. Inve...

In industry, the cost of production is an important factor and it is preferred to use conventional and low cost procedures for producing the parts. Heat treatment cycles and alloying additions are the key factors affecting the microstructure and mechanical properties of the cast steels. In this study an attempt was made to evaluate the influence of minor Mo addition on the microstructure and me...

Microstructure evolution and precipitation behaviors before after tension at elevated temperature of Nb Nb-Mo microalloyed fire-resistant steels were investigated by scanning electron microscopy transmission microscopy, physical–chemical phase analysis small-angle X-ray scattering. Results showed that the martensite austenite (M/A) islands in a rolled state disappeared tempering, cementite larg...

Purpose. Investigate the effect of complex microalloying with nitrogen, titanium and aluminum on structure properties cast steels at elevated temperatures. Methodology. Methods optical microscopy were used for metallographic analysis microstructure steels. The mechanical room temperatures determined static tension, crease impact bending. Results. technology carbonitride strengthening silicon-ma...

The demand of highest possible effectiveness is put on all production processes, while the highest quality is demanded from products. These requirements are particularly justifi ed in the steel industry, due to high cost of technical equipment assembly and production cost. In such conditions continuous processes are of signifi cant meaning, since they facilitate maximum utilization of productio...