Využití programu Surfer při sestavování prostorové mapy tvařitelnosti za tepla

Abstract

This bachelor thesis deals with drafting 3D maps of hot formability using different methods in the Surfer software, based on results of uniaxial tensile tests carried on samples of rail steel S60B running on plastometer Gleeble 3800. Tensile tests were carried out in the temperature range from 900 to 1400 ° C and at testing speed range of 25, 250 and 2000 mm∙s-1. The test results were used to generate 3D maps of ductility and strength, which were drafted by three methods. Based on specified criteria, Shepard’s method appeared to be ideal, with which the further maps with varying value of the smoothing factor were generated. The resulting 3D map evidently showed the deformation behavior of steel. With increasing testing speed, strength grew considerably due to increased flow stress. With increasing temperature strength decreased and temperature above 1380 °C steel was overheated and burned, which was reflected on the map by zero strength and ductility. It may be said that the ductility at temperatures above 1000 ° C increased with increasing drawing speed.