Effect of Martensite Fraction on Void Nucleation Behavior and Ductility in DP Steels

Daisuke Maeda; Osamu Kawano

doi:10.4028/www.scientific.net/MSF.783-786.875

Paper Titles

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Optimization of Mechanical Properties of High Strength TRIP Steels
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Microstructure and Mechanical Properties of Extra High Strength Heavy Steel Plate for Bridge Application
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The Development and Application of High-Performance Ultra-High Strength Stainless Steel Subject to Marine Environment
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Effect of Martensite Fraction on Void Nucleation Behavior and Ductility in DP Steels
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Dilatometer Analysis of the One Step Quenching and Partitioning Process in a 1.5%Si Steel
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Temperature and Stress State Influence on Mechanical Properties and Damage Evolution of Dual-Phase Steels
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Nucleation Rate and Number of Precipitates in V and Nb-Microalloyed Steels
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Microstructures and Mechanical Properties of Stainless Steel AISI 316L Processed by Selective Laser Melting
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HomeMaterials Science ForumMaterials Science Forum Vols. 783-786Effect of Martensite Fraction on Void Nucleation...

Effect of Martensite Fraction on Void Nucleation Behavior and Ductility in DP Steels

Abstract:

Void nucleation behavior of ferrite/martensite dual phase steels varying martensite fraction was investigated. As easily recognized, void fraction was increased with strain induced, and more voids were nucleated in the sample with higher martensite fraction. On the other hands, void fraction at ductile fracture was decreased with increasing martensite fraction. Void nucleation was observed to occur due to the fracture of martensite in DP steels. In the sample with high martensite fraction, many micro voids were nucleated at initial deformation with small strain and lead to ductile fracture. Inter-voids distance at the fracture was almost same among the DP steels with various martensite fractions. It is considered that the most effective factor on ductile fracture of DP steels was not 2^nd phase fraction but the distance between 2^nd phases which caused micro voids.