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| Stabilization of Austenite in Quenched Alloy Steels |
| KANG Mokuang; ZHU Ming |
| School of Materials; Northwestern Polytechnical University; Xi'an 710072 |
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Cite this article:
KANG Mokuang; ZHU Ming. Stabilization of Austenite in Quenched Alloy Steels. Acta Metall Sin, 2005, 41(7): 673-679 .
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Abstract
Retained austenite exists in alloy steels both continuously
quenched and isothermally quenched, so its content relates to the austenitic
stabilization. The article focuses on the investigation for the austenitic
stabilization in isothermally quenched microstructures from duplex phase
(martensite--M, bainite--B) temperature region. Within a certain
isothermal time, the relationship of the amount of retained
austenite AR vs isothermal
temperature is a saddle--like curve, and the valley
value for testing steel is less than that of continuous
quenching with a same cooling medium, which proves
that isothermal soak does not increase retained
austenitic quantity on certain condition. By adjusting
the content ratios of AR/M and AR/B on
the saddle--like curve, an isothermal quenching of the
less deformation or a meta-bainitic isothermal quenching
with strength--toughness optimized combination
can be achieved. Austenitic stabilization is the synthetic
effect of thermal, chemical, phase induced and macro--thermal
stress stabilized mechanisms. The martensite
critical point Mc has not
the special physical meaning.
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Received: 24 October 2004
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