Computer Model of Phase Transformation From Hot-Deformed Austenite in Niobium Microalloyed Steels

Based on thermodynamics and kinetics, a new mathematical model was developed to calculate the CCT diagrams and the transformation kinetics in low carbon niobium steels, in which the effect of deformation on the degree of supercooling was taken into account. The undercooling caused by deformation is...

Full description

Saved in:
Bibliographic Details
Published in:Journal of iron and steel research, international international, 2007-03, Vol.14 (2), p.66-69
Main Authors: XU, Yun-bo, YU, Yong-mei, LIU, Xiang-hua, WANG, Guo-dong
Format: Article
Language:English
Subjects:
computer model
continuous cooling transformation
low carbon niobium steel
supercooling degree
thermodynamics
热形变奥氏体
相转变
计算机模型
铌微合金钢
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Based on thermodynamics and kinetics, a new mathematical model was developed to calculate the CCT diagrams and the transformation kinetics in low carbon niobium steels, in which the effect of deformation on the degree of supercooling was taken into account. The undercooling caused by deformation is the major reason for the increase of the starting transition temperature during continuous cooling. The critical cooling rate of bainite formation is within 2--5 ℃s for the studied niobium steels and deformation is suitable for the occurrence of pearlite. The ferrite volume fraction increases with the increase of the austenite boundary area, and decreases with the increase of the cooling rate. The calculated CCT diagrams and the volume fraction of each phase are in good agreement with the measurements.
ISSN:1006-706X
2210-3988
DOI:10.1016/S1006-706X(07)60030-2