Thermomechanical treatment of Ti-Nb-V-B micro-alloyed steel forgings
Termomehanska obdelava odkovkov iz mikrolegiranega jekla Ti-Nb-V-B

english

2014

volume 48, issue 4

micro-alloyed steels   thermomechanical treatment    forged parts   mechanical properties 

Inštitut za kovinske materiale in tehnologije
(Obvezni izvod spletne publikacije)

The work presents the research results of the influence of thermomechanical treatment through forging on the microstructure and mechanical properties of newly elaborated micro-alloyed steel containing 0.28 % C, 1.41 % Mn, 0.028 % Ti, 0.027 % Nb and 0.019 % V. The applied thermomechanical treatment makes it possible to obtain a fine-grained microstructure of austenite during the hot working and the production of forged parts that acquire an advantageous set of mechanical properties and a guaranteed crack resistance after controlled cooling from the finishing plastic-deformation temperature and the successive tempering. The forgings produced with the method of thermomechanical treatment, consecutively subjected to tempering in the temperature range from 550 °C to 650 °C, have YS0.2 from 994 MPa to 939 MPa, UTS from 1084 MPa to 993 MPa and KV-40 from 77 J to 83 J.

06.11.2015