Influence of volume fraction of martensite on the work hardening behaviour of two dual-phase steels with high and low silicon contents

2010 ◽  
Vol 101 (10) ◽  
pp. 1286-1292 ◽  
Author(s):  
Ashkan Nouri ◽  
Hasan Saghafian ◽  
Shahram Kheirandish
Keyword(s):  
Work Hardening ◽  
Volume Fraction ◽  
Dual Phase ◽  
Dual Phase Steels

Two stage cyclic work hardening and two slope coffin-manson relationship in dual phase steels

1986 ◽  
Vol 20 (4) ◽  
pp. 555-558 ◽  
Author(s):  
S.R. Mediratta ◽  
V. Ramaswamy ◽  
P. Rama Rao
Keyword(s):  
Work Hardening ◽  
Dual Phase ◽  
Two Stage ◽  
Dual Phase Steels

Cyclic work hardening and formation of dislocation substructures during low-cycle fatigue of tempered dual-phase steels

1990 ◽  
Vol 61 (7) ◽  
pp. 325-332 ◽  
Author(s):  
Shree Ram Mediratta ◽  
Vaidyanath Ramaswamy ◽  
Vakil Singh ◽  
Rama Rao
Keyword(s):  
Work Hardening ◽  
Low Cycle Fatigue ◽  
Dual Phase ◽  
Cycle Fatigue ◽  
Dual Phase Steels

scholarly journals Effect of Martensite Volume Fraction on Void Formation Leading to Ductile Fracture in Dual Phase Steels

2014 ◽  
Vol 54 (4) ◽  
pp. 938-944 ◽  
Author(s):  
Takashi Matsuno ◽  
Daisuke Maeda ◽  
Hiroshi Shutoh ◽  
Akihiro Uenishi ◽  
Masayoshi Suehiro
Keyword(s):  
Ductile Fracture ◽  
Volume Fraction ◽  
Void Formation ◽  
Dual Phase ◽  
Dual Phase Steels ◽  
Martensite Volume Fraction

scholarly journals Effect of Volume Fraction of Constituent Phases on the Stress-Strain Relationship of Dual Phase Steels.

1999 ◽  
Vol 39 (3) ◽  
pp. 288-294 ◽  
Author(s):  
Thomas Hüper ◽  
Shigeru Endo ◽  
Nobuyuki Ishikawa ◽  
Koichi Osawa
Keyword(s):  
Volume Fraction ◽  
Dual Phase ◽  
Stress Strain ◽  
Dual Phase Steels ◽  
Strain Relationship ◽  
Relationship Of

Ductile Fracture Behavior of Bainite-MA Dual Phase Steels

2014 ◽  
Author(s):  
Junji Shimamura ◽  
Kyono Yasuda ◽  
Nobuyuki Ishikawa ◽  
Shigeru Endo
Keyword(s):  
Ductile Fracture ◽  
Fracture Behavior ◽  
Volume Fraction ◽  
Void Nucleation ◽  
Ground Movement ◽  
Dual Phase ◽  
Dual Phase Steels ◽  
Boundary Area ◽  
Strain Capacity ◽  
Shelf Region

In order to achieve safety and reliability of the pipeline installed in seismic region, it is quite important to apply the high-strength linepipes with sufficient strain capacity against buckling and weld fracture by the seismic ground movement. Dual-phase microstructure control is an essential measure for improving strain capacity of linepipe steels. Ferrite-bainite or bainite-MA microstructures are practically applied to the linepipes for the strain-based design to achieve higher deformability which has low Y/T (Yield/Tensile strength) ratio and high uniform elongation even after pipe coating. On the other hand, dual-phase steels tend to show lower Charpy energy in the upper shelf region than single-phase steel. It is considered that void nucleation and growth is enhanced in the dual-phase steels due to the strain concentration at the boundary between two different phases, resulting in early cracking in the specimen that leads to lower Charpy energy. The Charpy energy of the bainite-MA dual-phase steels was strongly affected by the volume fraction and size of MA. In the case of Bainite-MA steels with fewer volume fraction of MA and smaller size of MA, the sample showed higher Charpy energy. Ductile fracture behavior was investigated through several kinds of Charpy impact tests in order to clarify the effect of these microstructure differences on the Charpy energy in the upper shelf region. From the SEM observation, it was found that void nucleation was enhanced in the sample with higher volume fraction of MA and larger size of MA. It is considered that the increase of boundary area that works as void nucleation site affected these results. Experimental results were mainly discussed in this paper.

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