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Title: Transformation kinetics in controlled-power and controlled-temperature cycle testing

Abstract

On-heating transformation kinetics were investigated for several steels by using a Gleeble capable of programmable power input as well as programmable temperature cycling. Transformation kinetics determined in both modes are reported. The temperature cycles are significantly different between the two modes due to the latent heat associated with the phase transformations. Both diffusion rates and transformation driving force increase with temperature above the eutectoid temperature, therefore the latent heat can potentially have a significant impact on the transformation kinetics. Experiments with plain carbon steels illustrate that the latent heat of austenite formation causes an appreciable temperature arrest during transformation, and the dilatation response is similarly altered. A kinetic transformation model, based on the decomposition of pearlite and the diffusional growth of austenite, reproduced the transient dilatation data obtained from both control modes reasonably well using the same kinetic parameter values.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Sandia National Labs., Albuquerque, NM (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
672114
Report Number(s):
SAND-98-1269C; CONF-980657-
ON: DE98005521; BR: DP0102031; TRN: AHC2DT07%%274
DOE Contract Number:
AC04-94AL85000
Resource Type:
Technical Report
Resource Relation:
Conference: 5. international conference on trends in welding research, Pine Mountain, GA (United States), 1-5 Jun 1998; Other Information: PBD: Jun 1998
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CRYSTAL-PHASE TRANSFORMATIONS; STEELS; KINETICS; THERMAL CYCLING; PEARLITE; AUSTENITE; EXPERIMENTAL DATA

Citation Formats

Robino, C.V., Knorovsky, G., Dykhuizen, R.C., MacCallum, D.O., and Damkroger, B.K. Transformation kinetics in controlled-power and controlled-temperature cycle testing. United States: N. p., 1998. Web. doi:10.2172/672114.
Robino, C.V., Knorovsky, G., Dykhuizen, R.C., MacCallum, D.O., & Damkroger, B.K. Transformation kinetics in controlled-power and controlled-temperature cycle testing. United States. doi:10.2172/672114.
Robino, C.V., Knorovsky, G., Dykhuizen, R.C., MacCallum, D.O., and Damkroger, B.K. Mon . "Transformation kinetics in controlled-power and controlled-temperature cycle testing". United States. doi:10.2172/672114. https://www.osti.gov/servlets/purl/672114.
@article{osti_672114,
title = {Transformation kinetics in controlled-power and controlled-temperature cycle testing},
author = {Robino, C.V. and Knorovsky, G. and Dykhuizen, R.C. and MacCallum, D.O. and Damkroger, B.K.},
abstractNote = {On-heating transformation kinetics were investigated for several steels by using a Gleeble capable of programmable power input as well as programmable temperature cycling. Transformation kinetics determined in both modes are reported. The temperature cycles are significantly different between the two modes due to the latent heat associated with the phase transformations. Both diffusion rates and transformation driving force increase with temperature above the eutectoid temperature, therefore the latent heat can potentially have a significant impact on the transformation kinetics. Experiments with plain carbon steels illustrate that the latent heat of austenite formation causes an appreciable temperature arrest during transformation, and the dilatation response is similarly altered. A kinetic transformation model, based on the decomposition of pearlite and the diffusional growth of austenite, reproduced the transient dilatation data obtained from both control modes reasonably well using the same kinetic parameter values.},
doi = {10.2172/672114},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Jun 01 00:00:00 EDT 1998},
month = {Mon Jun 01 00:00:00 EDT 1998}
}

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