Interaction Between Precipitation and Dynamic Recrystallization in HSLA-100 Microalloyed Steel

Document Type: Research Paper

Authors

1 Department of Materials and Polymer Engineering, Hakim Sabzevari University, Sabzevar, Iran

2 Department of Materials Science and Engineering, Hamedan University of Technology, Hamedan, Iran

3 Department of Civil Engineering, Faculty of Engineering, Hakim Sabzevari University, Sabzevar, Iran

Abstract

Strain induced precipitation in HSLA-100 steel was investigated by conducting hot
compression and relaxation tests at temperature range of 850°C to 1100°C and strain rate of 0.001
s-1 to 1s-1. The absence of dynamic recrystallization at temperatures below 1000°C was attributed
to the influence of dynamic precipitation. The stress relaxation tests showed that strain induced
precipitation is possible over a wide range of temperatures from 850°C to 1050°C. The starting
and finishing times of precipitation were sensitive to temperature than strain rate. At temperature
range of 950-1000°C and strain rate of 0.1s-1 the lowest times for precipitation were observed. The
combination of precipitation-time-temperature and recrystallization-time temperature diagrams
showed that at high temperatures and low strain rates, precipitation precedes dynamic
recrystallization, whereas at the opposite condition, dynamic recrystallization goes in advance. The
starting and finishing times for dynamic precipitation were approximated about 40 percent lower
that those for strain induced precipitation.

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