NDLI: Formation of abnormal structures and their effects on the ductility of eutectoid steel

Content Provider	Springer Nature Link
Author	An, Kang Suk Jeong, Shin Woong Bea, Hyeong Jun Nam, Won Jong
Copyright Year	2016
Abstract	The formation of abnormal structures and their effects on reduction of area (RA) were investigated in eutectoid steels transformed at different temperatures ranging from 560 °C-650 °C. The occurrence of abnormal structures, such as upper bainite, degenerate pearlite, free ferrite, and grain boundary cementite, was confirmed. The volume fraction of upper bainite and degenerate pearlite decreased on increasing the transformation temperature, while the amount of free ferrite increased. As the transformation temperature increased, RA increased, reached a maximum, and then decreased, while the tensile strength continuously decreased. The crack formations during the tensile test could be classified into three types: tearing, shear cracking, and void formation/ coalescence. The decrease of the ductility at low transformation temperatures was attributed to the increased amount of upper bainite and degenerate pearlite, since the formation of cracks occurred by tearing interfaces or by void formation at abnormal structures during the tensile test. Meanwhile, the decrease in RA at high transformation temperatures was attributed to the occurrence of shear cracking rather than the presence of abnormal structures.
Starting Page	995
Ending Page	1002
Page Count	8
File Format	PDF
ISSN	15989623
Journal	Metals and Materials
Volume Number	22
Issue Number	6
e-ISSN	20054149
Language	English
Publisher	The Korean Institute of Metals and Materials
Publisher Date	2016-10-30
Publisher Place	Seoul
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	tensile test strength ductility scanning electron microscopy(SEM) phase transformation Metallic Materials Operating Procedures, Materials Treatment Magnetism, Magnetic Materials Engineering Thermodynamics, Heat and Mass Transfer Characterization and Evaluation of Materials Continuum Mechanics and Mechanics of Materials
Content Type	Text
Resource Type	Article
Subject	Materials Chemistry Mechanics of Materials Metals and Alloys Condensed Matter Physics

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