Activation Energy for Superplastic Flow Above Critical Temperature of Die Steels

Some commercial cold working die steels C.,Cr15 and CrWMn with ultra fine grain size were chosen as tested materials to research the activation energy for superplastic flow at different temperatures and strain rates above critical temperature. Based on the Arrhenius equation, the activation energy f...

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Bibliographic Details
Published inJournal of iron and steel research, international Vol. 13; no. 5; pp. 4 - 6
Main Authors WEN, Jiu-ba, ZHANG, Ke-ke, CHEN, Fu-xiao, YANG, Yong-shun
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.09.2006
School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471003, Henan, China
Subjects
activation energy
superplastic working
superplasticity
临界温度
模具钢
活化能
超塑性
超塑性加工
activation energy
superplasticity
superplastic working
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Summary:Some commercial cold working die steels C.,Cr15 and CrWMn with ultra fine grain size were chosen as tested materials to research the activation energy for superplastic flow at different temperatures and strain rates above critical temperature. Based on the Arrhenius equation, the activation energy for superplastic flow is evaluated. The activation energy at constant strain rate is estimated by the logσ, vs 1/T relationship. The results show that the ac tivation energy is usually small under the conditions of optimal flow. The characteristics of superplastic deformation of steels above the critical temperature were also analyzed.
Bibliography:superplasticity; superplastic working; activation energy
activation energy
11-3678/TF
superplastic working
superplasticity
TG142.45
ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:1006-706X
2210-3988
DOI:10.1016/S1006-706X(06)60085-X