a neural network with feed forward topology and back propagation algorithm was used to investigate the effect of composition on mechanical properties in api x65 microalloyed steel (used in manufacturing of large diameter pipes). experimental data was obtained by cutting 100 specimens from pipes manufactured in industrial scale (with similar heats and manufacturing processes). the chemical analy...

the aim of the paper presented here is to develop the ti - micralloyed steel in otrer to oprtmize the mechanical properties after direct quenching from hot forging temperature. for this purpose, seven melts containing various amounts of titanium were prepared and cast in metal and sand molds. from the ingots, cast in metal mould, tractor links were produced by hot forging. the produced links we...

Abstract The composite precipitation of Ti 2 O 3 + TiN during continuous casting has an important influence on the microstructure and properties slab. In order to study conditions , TiC second phase in titanium microalloyed steel, solid-liquid line temperature, initial temperature different phase, equilibrium actual solubility product at temperatures are calculated, rules steel liquid two-phase...

A large testing programme of a strip steel grade, microalloyed by vanadium, titanium and niobium, was conducted. The experiment was based on combination of cold rolling, recrystallization annealing, mechanical testing, metallographic examinations, SEM and TEM analyses. Samples in the form of stripes with dimensions of 3.9×25×500 mm were rolled in several passes with the total height reduction o...

Notch deformation behaviour under monotonic and cyclic loading conditions was investigated using circumferentially notched round bar and double-notched flat plate geometries, each with two different notch concentration factors. Notch strains for the double-notched plate geometry were measured with the use of miniature strain gauges bonded to specimens made of a vanadium-based microalloyed steel...

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...