Numéro
J. Phys. IV France
Volume 03, Numéro C7, Novembre 1993
The 3rd European Conference on Advanced Materials and Processes
Troisiéme Conférence Européenne sur les Matériaux et les Procédés Avancés
Page(s) C7-77 - C7-82
DOI http://dx.doi.org/10.1051/jp4:1993708
The 3rd European Conference on Advanced Materials and Processes
Troisiéme Conférence Européenne sur les Matériaux et les Procédés Avancés

J. Phys. IV France 03 (1993) C7-77-C7-82

DOI: 10.1051/jp4:1993708

Structure and properties of TM processed HSLA steels

A.C. KNEISSL and P. BALDINGER

Institute of Physical Metallurgy and Materials Testing, Montan-University of Leoben, Austria


Abstract
This paper deals with the influence of steel composition (with respect to the microalloying elements) and thermomechanical treatment on structure and mechanical behaviour of HSLA (High Strength Low Alloy) steels. Four different microalloyed steels have been TM rolled under variing conditions. The austenite structure prior to transformation could be revealed by means of a special etching technique. The precipitation behaviour has been studied by TEM, STEM and APFIM investigations. The results of mechanical testing can be explained in terms of structure (both austenite and transformed material), steel composition and TM treatment. It could be shown how precipitates in different steels influence the recrystallization behaviour of the austenite and how the austenite structure is related to the transformed structure. For example, fine strain-induced Nb carbonitrides prevent or reduce recristallization. Addition of Ti leads to relatively coarse complex carbonitrides. As a consequence, the content of solute Nb decreased and only few Nb carbonitrides precipitate during deformation. Hence the Ti-bearing steel shows a stronger tendency for recrystallization and the mechanical properties (especially the low-temperature ductility) deteriorate.



© EDP Sciences 1993