Effect of competing hardening and softening mechanisms on the flow stress curve modeling of ultra-low carbon steel at high temperatures

The relationships between flow stress curve and microstructure evolution in strain induced dynamic phase transformation (SIDT) of low carbon steel (0.22wt.%) were quantitatively investigated. The deformation was carried out at just above Ar3 temperature (710°C) as a function of strain rate (0.01-5/sec). The softening process of SIDT was well agreed with calculated result derived from Avrami’s and constitutive equation at higher strain rate than 0.5/sec. However, the calculated results differed from the experimental curve at strain rate of less than 0.2/sec. This is due to fact that the dynamic transformation from austenite to ferrite can not be completed owing to less stored energy during hot deformation.

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Flow Stress Constitutive Model of Ultra Low Carbon Steel in Warm Deformation

ISIJ International ◽

10.2355/isijinternational.46.166 ◽

2006 ◽

Vol 46 (1) ◽

pp. 166-168 ◽

Cited By ~ 1

Author(s):

Guang Xu ◽

Chushao Xu ◽

Jiarong Zhao

Keyword(s):

Flow Stress ◽

Carbon Steel ◽

Constitutive Model ◽

Low Carbon Steel ◽

Low Carbon ◽

Warm Deformation ◽

Ultra Low Carbon Steel

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Estimation of Flow Stress by the Kocks-Mecking Model at Strain Rate of 103/s for an Ultra Low Carbon Steel

Tetsu-to-Hagane ◽

10.2355/tetsutohagane1955.87.10_657 ◽

2001 ◽

Vol 87 (10) ◽

pp. 657-664 ◽

Cited By ~ 14

Author(s):

Jong-Ho PARK ◽

Yo TOMOTA ◽

Shusaku TAKAGI ◽

Shin ISHIKAWA ◽

Tetsuo SHIMIZU

Keyword(s):

Flow Stress ◽

Carbon Steel ◽

Strain Rate ◽

Low Carbon Steel ◽

Low Carbon ◽

Ultra Low Carbon Steel

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Flow Stress and Pyroplastic Behaviour of Ultra-Low Carbon Steel in Warm Temperature Range

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.939.415 ◽

2014 ◽

Vol 939 ◽

pp. 415-421

Author(s):

Ning Kong ◽

Hong Tao Zhu ◽

Kiet Tieu ◽

Qiang Zhu

Keyword(s):

Flow Stress ◽

Carbon Steel ◽

Constitutive Equation ◽

Low Carbon Steel ◽

Warm Rolling ◽

Fe Model ◽

Low Carbon ◽

Warm Temperature ◽

Temperature Range ◽

Ultra Low Carbon Steel

In order to analyze the mechanical behaviour of ultra-low carbon steel in warm rolling, the flow stress and pyroplastric behaviour were investigated on the Gleeble-3500 with the deformation temperatures in the warm range. The strain rates of 0.1, 1 and 10s-1 were applied to the temperatures above. A series of stress-strain curves were obtained after the compression Gleeble tests with different parameters. The result indicates the flow stress increases with the decreasing deformation temperatures during the compression. And it increases with the increasing strain rate as well. The constitutive equation, which includes the deformation activation energy Q and the Kelvin temperature T, was developed by using the concept that proposed by C. M. Sellars and W.J. M. Tegart. These equation results can be verified by the results of Gleeble compression test. It indicates the average error is reasonable and acceptable for predicting the flow stress and pyroplastic deformation behaviour of ultra-low carbon steel in warm temperature range. The achieved constitutive equation provides theoretical fundaments for designing the warm rolling process of ultra-low carbon steel. The experimental data also can be used as material property parameters for the establishment of finite element (FE) model.

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