Strain localization and crack formation effects on stress-strain response of ductile iron

被引：14

作者：

Kasvayee, Keivan A. ^{[1
]}

Ghassemali, Ehsan ^{[1
]}

Salomonsson, Kent ^{[1
]}

Sujakhu, S. ^{[2
]}

Castagne, S. ^{[2
]}

Jarfors, Anders E. W. ^{[1
]}

机构：

[1] Jonkoping Univ, Sch Engn, Box 1026, S-55111 Jonkoping, Sweden

[2] Nanyang Technol Univ, Sch Mech & Aerosp Engn, Singapore 639798, Singapore

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2017年 / 702卷

关键词：

In-situ tensile test; Digital image correlation; Micro-crack; Graphite-matrix decohesion; Cracking; NODULAR CAST-IRON; DAMAGING MICROMECHANISMS; SIMULATION; BEHAVIOR; FRACTURE; GROWTH;

D O I：

10.1016/j.msea.2017.07.018

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The strain localization and crack formation in ferritic-pearlitic ductile iron under tension was investigated by in situ tensile tests. In-situ tensile tests under optical microscope were performed and the onset of the early ferrite graphite decohesions and micro-cracks inside the matrix were studied. The results revealed that early ferrite graphite decohesion and micro-cracks inside the ferrite were formed at the stress range of 280-330 MPa, where a kink occurred in the stress-strain response, suggesting the dissipation of energy in both plastic deformation and crack initiation. Some micro-cracks initiated and propagated inside the ferrite but were arrested within the ferrite zone before propagating in the pearlite. Digital Image Correlation (DIC) was used to measure local strains in the deformed micrographs obtained from the in-situ tensile test. Higher strain localization in the microstructure was measured for the areas in which the early ferrite-graphite decohesions occurred or the micro cracks initiated.

引用

页码：265 / 271

页数：7

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