Comparison of effacement curve with dilatation curve for prediction of labor progression

2017 ◽  
Vol 44 (1) ◽  
pp. 102-108 ◽  
Author(s):  
Jila Agah ◽  
Roya Baghani ◽  
Milad Nazarzadeh ◽  
Sedigheh Borna
Keyword(s):  
Dilatation Curve

Simulation of Dilatation Curve Associated with Martensitic Transformation in a Dual-Phase Steel

2015 ◽  
Vol 816 ◽  
pp. 769-774
Author(s):  
Peng Chen ◽  
Peng Ju Du ◽  
Di Wu ◽  
Guo Dong Wang ◽  
Hong Liang Yi
Keyword(s):  
Martensitic Transformation ◽  
Martensite Transformation ◽  
Dual Phase Steel ◽  
Single Phase ◽  
Intercritical Annealing ◽  
Equilibrium Phase ◽  
Equilibrium Phase Diagram ◽  
Dual Phase ◽  
Dilatation Curve ◽  
Thermal Dilatation

The specific volume of alloys can be calculated using Thermo-Calc®for the problem of diffusion transformation in equilibrium or a single phase. The martensite transformation in a displacive manner can not be treated directly with Thermo-Calc®. A method to calculate the thermal dilatation curves for a dual-phase steel was established in this research associated with martensitic transformation from ferrite plus austenite after intercritical annealing. The equilibrium phase diagram, martensite starting temperature, as well as transformed martensite fraction have been involved in the calculations. The results showed that the calculated dilatation curves were in accordance with the measured curves by dilatometer, and indicated the reason for the ambiguous volume change in the dual-phase steel owing to its small fraction of austenite associating with martensite transformation.

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