Fracture Toughness of Advanced TRIP-Aided Martensitic Steels

Koh Ichi Sugimoto; Junya Kobayashi; Daiki Ina

doi:10.4028/www.scientific.net/KEM.577-578.97

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Improvement of an Ellipsoidal Void Model for Simulating Ductile Fracture Behavior
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HomeKey Engineering MaterialsKey Engineering Materials Vols. 577-578Fracture Toughness of Advanced TRIP-Aided...

Fracture Toughness of Advanced TRIP-Aided Martensitic Steels

Abstract:

The effects of microalloying on the fracture toughness of 0.2%C1.5%Si1.5%Mn 0.05%Nb (mass%) transformation-induced plasticity-aided steel with a lath-martensite structure matrix were investigated. When 0.002% B or 1.0% Cr was added to the base steel, the steel achieved a fracture toughness that was as high as that of 18%Ni maraging steel. Based on our results, the high fracture toughness was essentially caused by (i) a matrix with a softened lath-martensite structure, low carbide content and low carbon concentration; (ii) the effective plastic relaxation of localized stress concentration by the strain-induced transformation of metastable retained austenite of about 3 vol% in the martensite-austenite constituent or phase.

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Advances in Fracture and Damage Mechanics XII

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Periodical:

Key Engineering Materials (Volumes 577-578)

Pages:

97-100

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.577-578.97

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Online since:

September 2013

Authors:

Koh Ichi Sugimoto, Junya Kobayashi, Daiki Ina

Keywords:

Fracture Toughness, M-A Constituent, Martensite, Microalloying, Retained Austenite, TRIP-Aided Steel, Ultrahigh-Strength

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References

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