Table of Contents
Textures and Microstructures
Volume 8 (1988) –9
http://dx.doi.org/10.1155/TSM.8-9.223

Texture and Microstructure of Some Low Alloy Steels Containing Nb and B

Seção de Engenharia e Ciência dos Materials, Instituto Militar de Engenharia, Praça General Tibúrcio 80, URCA, Rio de Janeiro, RJ 22290, Brazil

Received 16 July 1987

Copyright © 1988 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

In the present work the textures and the microstructures of some controlled rolled low carbon steels containing Nb and B were correlated to their boron content. This varied from 5 to 21 ppm and had the effect of replacing polygonal ferrite in the lower B-content steels by bainitic ferrite in the higher B-content ones. The grain size decreased from ~3 μm in the former to 1 μm in the latter. The texture became correspondingly stronger as the transformation mechanism changed from diffusional to shear mode. Considering that the rolling schedule and cooling rate (air) were the same for all steels the textural and microstructural changes are attributed to the change in boron content.